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Commit b302d68e authored by Dominik Honnef's avatar Dominik Honnef Committed by Sameer Ajmani
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misc/emacs: Greatly improve go-mode for Emacs. 

The original go-mode is plagued with odd behaviour, lack of
behaviour typical to modes in Emacs and bugs.

This change rewrites great parts of go-mode (basically only
keeping the gofmt and godoc functions).

Additionally it adds new features such as manipulating package
imports.

For more information please see
https://groups.google.com/group/golang-nuts/browse_frm/thread/3a9d6dae3369c0b5/1efe65e2f7afb190

Fixes #3618.
Fixes #4240.
Fixes #4322.
Fixes #4671.
Fixes #4726.

R=golang-dev, fullung, sameer, cw, arthur, proppy, adonovan, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/7314113
parent 6c2cbdb1
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misc/emacs/go-mode-load.el
View file @ b302d68e
;;; go-mode-load.el --- Major mode for the Go programming language ;;; go-mode-load.el --- automatically extracted autoloads
;;; Commentary: ;;; Commentary:
;; To install go-mode, add the following lines to your .emacs file: ;; To install go-mode, add the following lines to your .emacs file:
;; (add-to-list 'load-path "PATH CONTAINING go-mode-load.el" t) ;; (add-to-list 'load-path "PATH CONTAINING go-mode-load.el" t)
;; (require 'go-mode-load) ;; (require 'go-mode-load)
;;
;; After this, go-mode will be used for files ending in '.go'. ;; After this, go-mode will be used for files ending in '.go'.
;;
;; To compile go-mode from the command line, run the following ;; To compile go-mode from the command line, run the following
;; emacs -batch -f batch-byte-compile go-mode.el ;; emacs -batch -f batch-byte-compile go-mode.el
;;
;; See go-mode.el for documentation. ;; See go-mode.el for documentation.
;;
;;; Code:
;; To update this file, evaluate the following form ;; To update this file, evaluate the following form
;; (let ((generated-autoload-file buffer-file-name)) (update-file-autoloads "go-mode.el")) ;; (let ((generated-autoload-file buffer-file-name)) (update-file-autoloads "go-mode.el"))
;;; Code:
;;;### (autoloads (gofmt-before-save gofmt go-mode) "go-mode" "go-mode.el" ;;;### (autoloads (go-download-play godoc gofmt-before-save go-mode)
;;;;;; (19917 17808)) ;;;;;; "go-mode" "go-mode.el" (20767 50749))
;;; Generated autoloads from go-mode.el ;;; Generated autoloads from go-mode.el
(autoload 'go-mode "go-mode" "\ (autoload 'go-mode "go-mode" "\
Major mode for editing Go source text. Major mode for editing Go source text.
This provides basic syntax highlighting for keywords, built-ins, This mode provides (not just) basic editing capabilities for
functions, and some types. It also provides indentation that is working with Go code. It offers almost complete syntax
\(almost) identical to gofmt. highlighting, indentation that is almost identical to gofmt,
proper parsing of the buffer content to allow features such as
navigation by function, manipulation of comments or detection of
strings.
Additionally to these core features, it offers various features to
help with writing Go code. You can directly run buffer content
through gofmt, read godoc documentation from within Emacs, modify
and clean up the list of package imports or interact with the
Playground (uploading and downloading pastes).
The following extra functions are defined:
- `gofmt'
- `godoc'
- `go-import-add'
- `go-remove-unused-imports'
- `go-goto-imports'
- `go-play-buffer' and `go-play-region'
- `go-download-play'
If you want to automatically run `gofmt' before saving a file,
add the following hook to your emacs configuration:
\(add-hook 'before-save-hook 'gofmt-before-save)
If you're looking for even more integration with Go, namely
on-the-fly syntax checking, auto-completion and snippets, it is
recommended to look at goflymake
\(https://github.com/dougm/goflymake), gocode
\(https://github.com/nsf/gocode) and yasnippet-go
\(https://github.com/dominikh/yasnippet-go)
\(fn)" t nil) \(fn)" t nil)
(add-to-list 'auto-mode-alist (cons "\\.go$" #'go-mode)) (add-to-list 'auto-mode-alist (cons "\\.go\\'" 'go-mode))
(autoload 'gofmt "go-mode" "\
Pipe the current buffer through the external tool `gofmt`.
Replace the current buffer on success; display errors on failure.
\(fn)" t nil)
(autoload 'gofmt-before-save "go-mode" "\ (autoload 'gofmt-before-save "go-mode" "\
Add this to .emacs to run gofmt on the current buffer when saving: Add this to .emacs to run gofmt on the current buffer when saving:
(add-hook 'before-save-hook #'gofmt-before-save) (add-hook 'before-save-hook 'gofmt-before-save).
Note that this will cause go-mode to get loaded the first time
you save any file, kind of defeating the point of autoloading.
\(fn)" t nil) \(fn)" t nil)
;;;*** (autoload 'godoc "go-mode" "\
Show go documentation for a query, much like M-x man.
\(fn QUERY)" t nil)
(autoload 'go-download-play "go-mode" "\
Downloads a paste from the playground and inserts it in a Go
buffer. Tries to look for a URL at point.
\(fn URL)" t nil)
;;;***
(provide 'go-mode-load) (provide 'go-mode-load)
;; Local Variables:
;; version-control: never
;; no-byte-compile: t
;; no-update-autoloads: t
;; coding: utf-8
;; End:
;;; go-mode-load.el ends here
misc/emacs/go-mode.el
View file @ b302d68e
;;; go-mode.el --- Major mode for the Go programming language ;;; go-mode.el --- Major mode for the Go programming language
;;; Commentary: ;; Copyright 2013 The Go Authors. All rights reserved.
;; Use of this source code is governed by a BSD-style
;; license that can be found in the LICENSE file.
;; For installation instructions, see go-mode-load.el (require 'cl)
(require 'diff-mode)
(require 'ffap)
(require 'find-lisp)
(require 'url)
;;; To do: (defconst go-dangling-operators-regexp "[^-]-\\|[^+]\\+\\|[/*&><.=|^]")
(defconst gofmt-stdin-tag "<standard input>")
(defconst go-identifier-regexp "[[:word:][:multibyte:]_]+")
(defconst go-label-regexp go-identifier-regexp)
(defconst go-type-regexp "[[:word:][:multibyte:]_*]+")
(defconst go-func-regexp (concat "\\<func\\>\\s *\\(" go-identifier-regexp "\\)"))
(defconst go-func-meth-regexp (concat "\\<func\\>\\s *\\(?:(\\s *" go-identifier-regexp "\\s +" go-type-regexp "\\s *)\\s *\\)?\\(" go-identifier-regexp "\\)("))
(defconst go-builtins
'("append" "cap" "close" "complex" "copy"
"delete" "imag" "len" "make" "new"
"panic" "print" "println" "real" "recover")
"All built-in functions in the Go language. Used for font locking.")
(defconst go-mode-keywords
'("break" "default" "func" "interface" "select"
"case" "defer" "go" "map" "struct"
"chan" "else" "goto" "package" "switch"
"const" "fallthrough" "if" "range" "type"
"continue" "for" "import" "return" "var")
"All keywords in the Go language. Used for font locking.")
(defconst go-constants '("nil" "true" "false" "iota"))
(defconst go-type-name-regexp (concat "\\(?:[*(]\\)*\\(?:" go-identifier-regexp "\\.\\)?\\(" go-identifier-regexp "\\)"))
;; * Indentation is *almost* identical to gofmt (defvar go-dangling-cache)
;; ** We think struct literal keys are labels and outdent them
;; ** We disagree on the indentation of function literals in arguments
;; ** There are bugs with the close brace of struct literals
;; * Highlight identifiers according to their syntactic context: type,
;; variable, function call, or tag
;; * Command for adding an import
;; ** Check if it's already there
;; ** Factor/unfactor the import line
;; ** Alphabetize
;; * Remove unused imports
;; ** This is hard, since I have to be aware of shadowing to do it
;; right
;; * Format region using gofmt
;;; Code: (defgroup go nil
"Major mode for editing Go code"
:group 'languages)
(eval-when-compile (require 'cl)) (defcustom go-fontify-function-calls t
"Fontify function and method calls if this is non-nil."
:type 'boolean
:group 'go)
(defvar go-mode-syntax-table (defvar go-mode-syntax-table
(let ((st (make-syntax-table))) (let ((st (make-syntax-table)))
;; Add _ to :word: character class
(modify-syntax-entry ?_ "w" st)
;; Operators (punctuation)
(modify-syntax-entry ?+ "." st) (modify-syntax-entry ?+ "." st)
(modify-syntax-entry ?- "." st) (modify-syntax-entry ?- "." st)
(modify-syntax-entry ?* "." st)
(modify-syntax-entry ?/ "." st)
(modify-syntax-entry ?% "." st) (modify-syntax-entry ?% "." st)
(modify-syntax-entry ?& "." st) (modify-syntax-entry ?& "." st)
(modify-syntax-entry ?| "." st) (modify-syntax-entry ?| "." st)
...@@ -43,77 +57,56 @@ ...@@ -43,77 +57,56 @@
(modify-syntax-entry ?= "." st) (modify-syntax-entry ?= "." st)
(modify-syntax-entry ?< "." st) (modify-syntax-entry ?< "." st)
(modify-syntax-entry ?> "." st) (modify-syntax-entry ?> "." st)
(modify-syntax-entry ?/ ". 124b" st)
;; Strings and comments are font-locked separately. (modify-syntax-entry ?* ". 23" st)
(modify-syntax-entry ?\" "." st) (modify-syntax-entry ?\n "> b" st)
(modify-syntax-entry ?\' "." st) (modify-syntax-entry ?\" "\"" st)
(modify-syntax-entry ?` "." st) (modify-syntax-entry ?\' "\"" st)
(modify-syntax-entry ?\\ "." st) (modify-syntax-entry ?` "\"" st)
(modify-syntax-entry ?\\ "\\" st)
(modify-syntax-entry ?_ "_" st)
st) st)
"Syntax table for Go mode.") "Syntax table for Go mode.")
(defvar go-mode-keywords (defun go--build-font-lock-keywords ()
'("break" "default" "func" "interface" "select" (append
"case" "defer" "go" "map" "struct" `((,(regexp-opt go-mode-keywords 'symbols) . font-lock-keyword-face)
"chan" "else" "goto" "package" "switch" (,(regexp-opt go-builtins 'symbols) . font-lock-builtin-face)
"const" "fallthrough" "if" "range" "type" (,(regexp-opt go-constants 'symbols) . font-lock-constant-face)
"continue" "for" "import" "return" "var") (,go-func-regexp 1 font-lock-function-name-face)) ;; function (not method) name
"All keywords in the Go language. Used for font locking and
some syntax analysis.") (if go-fontify-function-calls
`((,(concat "\\(" go-identifier-regexp "\\)[[:space:]]*(") 1 font-lock-function-name-face) ;; function call/method name
(defvar go-mode-font-lock-keywords (,(concat "(\\(" go-identifier-regexp "\\))[[:space:]]*(") 1 font-lock-function-name-face)) ;; bracketed function call
(let ((builtins '("append" "cap" "close" "complex" "copy" "delete" "imag" "len" `((,go-func-meth-regexp 1 font-lock-function-name-face))) ;; method name
"make" "new" "panic" "print" "println" "real" "recover"))
(constants '("nil" "true" "false" "iota")) `(
(type-name "\\s *\\(?:[*(]\\s *\\)*\\(?:\\w+\\s *\\.\\s *\\)?\\(\\w+\\)") ("\\<type\\>[[:space:]]*\\([^[:space:]]+\\)" 1 font-lock-type-face) ;; types
) (,(concat "\\<type\\>[[:space:]]*" go-identifier-regexp "[[:space:]]*" go-type-name-regexp) 1 font-lock-type-face) ;; types
`((go-mode-font-lock-cs-comment 0 font-lock-comment-face t) (,(concat "\\(?:[[:space:]]+\\|\\]\\)\\[\\([[:digit:]]+\\|\\.\\.\\.\\)?\\]" go-type-name-regexp) 2 font-lock-type-face) ;; Arrays/slices
(go-mode-font-lock-cs-string 0 font-lock-string-face t) (,(concat "map\\[[^]]+\\]" go-type-name-regexp) 1 font-lock-type-face) ;; map value type
(,(regexp-opt go-mode-keywords 'words) . font-lock-keyword-face) (,(concat "\\(" go-identifier-regexp "\\)" "{") 1 font-lock-type-face)
(,(regexp-opt builtins 'words) . font-lock-builtin-face) (,(concat "\\<map\\[" go-type-name-regexp) 1 font-lock-type-face) ;; map key type
(,(regexp-opt constants 'words) . font-lock-constant-face) (,(concat "\\<chan\\>[[:space:]]*\\(?:<-\\)?" go-type-name-regexp) 1 font-lock-type-face) ;; channel type
;; Function names in declarations (,(concat "\\<\\(?:new\\|make\\)\\>\\(?:[[:space:]]\\|)\\)*(" go-type-name-regexp) 1 font-lock-type-face) ;; new/make type
("\\<func\\>\\s *\\(\\w+\\)" 1 font-lock-function-name-face) ;; TODO do we actually need this one or isn't it just a function call?
;; Function names in methods are handled by function call pattern (,(concat "\\.\\s *(" go-type-name-regexp) 1 font-lock-type-face) ;; Type conversion
;; Function names in calls (,(concat "\\<func\\>[[:space:]]+(" go-identifier-regexp "[[:space:]]+" go-type-name-regexp ")") 1 font-lock-type-face) ;; Method receiver
;; XXX Doesn't match if function name is surrounded by parens ;; Like the original go-mode this also marks compound literal
("\\(\\w+\\)\\s *(" 1 font-lock-function-name-face) ;; fields. There, it was marked as to fix, but I grew quite
;; Type names ;; accustomed to it, so it'll stay for now.
("\\<type\\>\\s *\\(\\w+\\)" 1 font-lock-type-face) (,(concat "^[[:space:]]*\\(" go-label-regexp "\\)[[:space:]]*:\\(\\S.\\|$\\)") 1 font-lock-constant-face) ;; Labels and compound literal fields
(,(concat "\\<type\\>\\s *\\w+\\s *" type-name) 1 font-lock-type-face) (,(concat "\\<\\(goto\\|break\\|continue\\)\\>[[:space:]]*\\(" go-label-regexp "\\)") 2 font-lock-constant-face)))) ;; labels in goto/break/continue
;; Arrays/slices/map value type
;; XXX Wrong. Marks 0 in expression "foo[0] * x"
;; (,(concat "]" type-name) 1 font-lock-type-face)
;; Map key type
(,(concat "\\<map\\s *\\[" type-name) 1 font-lock-type-face)
;; Channel value type
(,(concat "\\<chan\\>\\s *\\(?:<-\\)?" type-name) 1 font-lock-type-face)
;; new/make type
(,(concat "\\<\\(?:new\\|make\\)\\>\\(?:\\s \\|)\\)*(" type-name) 1 font-lock-type-face)
;; Type conversion
(,(concat "\\.\\s *(" type-name) 1 font-lock-type-face)
;; Method receiver type
(,(concat "\\<func\\>\\s *(\\w+\\s +" type-name) 1 font-lock-type-face)
;; Labels
;; XXX Not quite right. Also marks compound literal fields.
("^\\s *\\(\\w+\\)\\s *:\\(\\S.\\|$\\)" 1 font-lock-constant-face)
("\\<\\(goto\\|break\\|continue\\)\\>\\s *\\(\\w+\\)" 2 font-lock-constant-face)))
"Basic font lock keywords for Go mode. Highlights keywords,
built-ins, functions, and some types.")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Key map
;;
(defvar go-mode-map (defvar go-mode-map
(let ((m (make-sparse-keymap))) (let ((m (make-sparse-keymap)))
(define-key m "}" #'go-mode-insert-and-indent) (define-key m "}" 'go-mode-insert-and-indent)
(define-key m ")" #'go-mode-insert-and-indent) (define-key m ")" 'go-mode-insert-and-indent)
(define-key m "," #'go-mode-insert-and-indent) (define-key m "," 'go-mode-insert-and-indent)
(define-key m ":" #'go-mode-delayed-electric) (define-key m ":" 'go-mode-insert-and-indent)
;; In case we get : indentation wrong, correct ourselves (define-key m "=" 'go-mode-insert-and-indent)
(define-key m "=" #'go-mode-insert-and-indent) (define-key m (kbd "C-c C-a") 'go-import-add)
m) m)
"Keymap used by Go mode to implement electric keys.") "Keymap used by Go mode to implement electric keys.")
...@@ -124,607 +117,229 @@ built-ins, functions, and some types.") ...@@ -124,607 +117,229 @@ built-ins, functions, and some types.")
(call-interactively (lookup-key (current-global-map) key)) (call-interactively (lookup-key (current-global-map) key))
(indent-according-to-mode)) (indent-according-to-mode))
(defvar go-mode-delayed-point nil (defmacro go-paren-level ()
"The point following the previous insertion if the insertion `(car (syntax-ppss)))
was a delayed electric key. Used to communicate between
`go-mode-delayed-electric' and `go-mode-delayed-electric-hook'.") (defmacro go-in-string-or-comment-p ()
(make-variable-buffer-local 'go-mode-delayed-point) `(nth 8 (syntax-ppss)))
(defun go-mode-delayed-electric (p) (defmacro go-in-string-p ()
"Perform electric insertion, but delayed by one event. `(nth 3 (syntax-ppss)))
This inserts P into the buffer, as usual, then waits for another key. (defmacro go-in-comment-p ()
If that second key causes a buffer modification starting at the `(nth 4 (syntax-ppss)))
point after the insertion of P, reindents the line containing P."
(defmacro go-goto-beginning-of-string-or-comment ()
(interactive "p") `(goto-char (nth 8 (syntax-ppss))))
(self-insert-command p)
(setq go-mode-delayed-point (point))) (defun go--backward-irrelevant (&optional stop-at-string)
"Skips backwards over any characters that are irrelevant for
(defun go-mode-delayed-electric-hook (b e l) indentation and related tasks.
"An after-change-function that implements `go-mode-delayed-electric'."
It skips over whitespace, comments, cases and labels and, if
(when (and go-mode-delayed-point STOP-AT-STRING is not true, over strings."
(= go-mode-delayed-point b))
(save-excursion (let (pos (start-pos (point)))
(save-match-data (skip-chars-backward "\n[:blank:]")
(goto-char go-mode-delayed-point) (if (and (save-excursion (beginning-of-line) (go-in-string-p)) (looking-back "`") (not stop-at-string))
(indent-according-to-mode)))) (backward-char))
(setq go-mode-delayed-point nil)) (if (and (go-in-string-p) (not stop-at-string))
(go-goto-beginning-of-string-or-comment))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; (if (looking-back "\\*/")
;; Parser (backward-char))
;; (if (go-in-comment-p)
(go-goto-beginning-of-string-or-comment))
(defvar go-mode-mark-cs-end 1 (setq pos (point))
"The point at which the comment/string cache ends. The buffer (beginning-of-line)
will be marked from the beginning up to this point (that is, up (if (or (looking-at (concat "^" go-label-regexp ":")) (looking-at "^[[:space:]]*\\(case .+\\|default\\):"))
to and including character (1- go-mode-mark-cs-end)).") (end-of-line 0)
(make-variable-buffer-local 'go-mode-mark-cs-end) (goto-char pos))
(if (/= start-pos (point))
(defvar go-mode-mark-string-end 1 (go--backward-irrelevant stop-at-string))
"The point at which the string cache ends. The buffer (/= start-pos (point))))
will be marked from the beginning up to this point (that is, up
to and including character (1- go-mode-mark-string-end)).") (defun go--buffer-narrowed-p ()
(make-variable-buffer-local 'go-mode-mark-string-end) "Return non-nil if the current buffer is narrowed."
(/= (buffer-size)
(defvar go-mode-mark-comment-end 1 (- (point-max)
"The point at which the comment cache ends. The buffer (point-min))))
will be marked from the beginning up to this point (that is, up
to and including character (1- go-mode-mark-comment-end)).") (defun go-previous-line-has-dangling-op-p ()
(make-variable-buffer-local 'go-mode-mark-comment-end) "Returns non-nil if the current line is a continuation line."
(let* ((cur-line (line-number-at-pos))
(defvar go-mode-mark-nesting-end 1 (val (gethash cur-line go-dangling-cache 'nope)))
"The point at which the nesting cache ends. The buffer will be (if (or (go--buffer-narrowed-p) (equal val 'nope))
marked from the beginning up to this point.") (save-excursion
(make-variable-buffer-local 'go-mode-mark-nesting-end) (beginning-of-line)
(go--backward-irrelevant t)
(defun go-mode-mark-clear-cs (b e l) (setq val (looking-back go-dangling-operators-regexp))
"An after-change-function that removes the go-mode-cs text property" (if (not (go--buffer-narrowed-p))
(remove-text-properties b e '(go-mode-cs))) (puthash cur-line val go-dangling-cache))))
val))
(defun go-mode-mark-clear-cache (b e)
"A before-change-function that clears the comment/string and (defun go-goto-opening-parenthesis (&optional char)
nesting caches from the modified point on." (let ((start-nesting (go-paren-level)))
(while (and (not (bobp))
(save-restriction (>= (go-paren-level) start-nesting))
(widen) (if (zerop (skip-chars-backward
(when (<= b go-mode-mark-cs-end) (if char
;; Remove the property adjacent to the change position. (case char (?\] "^[") (?\} "^{") (?\) "^("))
;; It may contain positions pointing beyond the new end mark. "^[{(")))
(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-cs))) (if (go-in-string-or-comment-p)
(if cs (car cs) b)))) (go-goto-beginning-of-string-or-comment)
(remove-text-properties (backward-char))))))
b (min go-mode-mark-cs-end (point-max)) '(go-mode-cs nil))
(setq go-mode-mark-cs-end b))) (defun go-indentation-at-point ()
(when (<= b go-mode-mark-string-end)
;; Remove the property adjacent to the change position.
;; It may contain positions pointing beyond the new end mark.
(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-string)))
(if cs (car cs) b))))
(remove-text-properties
b (min go-mode-mark-string-end (point-max)) '(go-mode-string nil))
(setq go-mode-mark-string-end b)))
(when (<= b go-mode-mark-comment-end)
;; Remove the property adjacent to the change position.
;; It may contain positions pointing beyond the new end mark.
(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-comment)))
(if cs (car cs) b))))
(remove-text-properties
b (min go-mode-mark-string-end (point-max)) '(go-mode-comment nil))
(setq go-mode-mark-comment-end b)))
(when (< b go-mode-mark-nesting-end)
(remove-text-properties b (min go-mode-mark-nesting-end (point-max)) '(go-mode-nesting nil))
(setq go-mode-mark-nesting-end b))))
(defmacro go-mode-parser (&rest body)
"Evaluate BODY in an environment set up for parsers that use
text properties to mark text. This inhibits changes to the undo
list or the buffer's modification status and inhibits calls to
the modification hooks. It also saves the excursion and
restriction and widens the buffer, since most parsers are
context-sensitive."
(let ((modified-var (make-symbol "modified")))
`(let ((buffer-undo-list t)
(,modified-var (buffer-modified-p))
(inhibit-modification-hooks t)
(inhibit-read-only t))
(save-excursion
(save-restriction
(widen)
(unwind-protect
(progn ,@body)
(set-buffer-modified-p ,modified-var)))))))
(defun go-mode-cs (&optional pos)
"Return the comment/string state at point POS. If point is
inside a comment or string (including the delimiters), this
returns a pair (START . END) indicating the extents of the
comment or string."
(unless pos
(setq pos (point)))
(when (>= pos go-mode-mark-cs-end)
(go-mode-mark-cs (1+ pos)))
(get-text-property pos 'go-mode-cs))
(defun go-mode-mark-cs (end)
"Mark comments and strings up to point END. Don't call this
directly; use `go-mode-cs'."
(setq end (min end (point-max)))
(go-mode-parser
(save-match-data
(let ((pos
;; Back up to the last known state.
(let ((last-cs
(and (> go-mode-mark-cs-end 1)
(get-text-property (1- go-mode-mark-cs-end)
'go-mode-cs))))
(if last-cs
(car last-cs)
(max 1 (1- go-mode-mark-cs-end))))))
(while (< pos end)
(goto-char pos)
(let ((cs-end ; end of the text property
(cond
((looking-at "//")
(end-of-line)
(1+ (point)))
((looking-at "/\\*")
(goto-char (+ pos 2))
(if (search-forward "*/" (1+ end) t)
(point)
end))
((looking-at "\"")
(goto-char (1+ pos))
(if (looking-at "[^\"\n\\\\]*\\(\\\\.[^\"\n\\\\]*\\)*\"")
(match-end 0)
(end-of-line)
(point)))
((looking-at "'")
(goto-char (1+ pos))
(if (looking-at "[^'\n\\\\]*\\(\\\\.[^'\n\\\\]*\\)*'")
(match-end 0)
(end-of-line)
(point)))
((looking-at "`")
(goto-char (1+ pos))
(while (if (search-forward "`" end t)
(if (eq (char-after) ?`)
(goto-char (1+ (point))))
(goto-char end)
nil))
(point)))))
(cond
(cs-end
(put-text-property pos cs-end 'go-mode-cs (cons pos cs-end))
(setq pos cs-end))
((re-search-forward "[\"'`]\\|/[/*]" end t)
(setq pos (match-beginning 0)))
(t
(setq pos end)))))
(setq go-mode-mark-cs-end pos)))))
(defun go-mode-in-comment (&optional pos)
"Return the comment/string state at point POS. If point is
inside a comment (including the delimiters), this
returns a pair (START . END) indicating the extents of the
comment or string."
(unless pos
(setq pos (point)))
(when (> pos go-mode-mark-comment-end)
(go-mode-mark-comment pos))
(get-text-property pos 'go-mode-comment))
(defun go-mode-mark-comment (end)
"Mark comments up to point END. Don't call this directly; use `go-mode-in-comment'."
(setq end (min end (point-max)))
(go-mode-parser
(save-match-data
(let ((pos
;; Back up to the last known state.
(let ((last-comment
(and (> go-mode-mark-comment-end 1)
(get-text-property (1- go-mode-mark-comment-end)
'go-mode-comment))))
(if last-comment
(car last-comment)
(max 1 (1- go-mode-mark-comment-end))))))
(while (< pos end)
(goto-char pos)
(let ((comment-end ; end of the text property
(cond
((looking-at "//")
(end-of-line)
(1+ (point)))
((looking-at "/\\*")
(goto-char (+ pos 2))
(if (search-forward "*/" (1+ end) t)
(point)
end)))))
(cond
(comment-end
(put-text-property pos comment-end 'go-mode-comment (cons pos comment-end))
(setq pos comment-end))
((re-search-forward "/[/*]" end t)
(setq pos (match-beginning 0)))
(t
(setq pos end)))))
(setq go-mode-mark-comment-end pos)))))
(defun go-mode-in-string (&optional pos)
"Return the string state at point POS. If point is
inside a string (including the delimiters), this
returns a pair (START . END) indicating the extents of the
comment or string."
(unless pos
(setq pos (point)))
(when (> pos go-mode-mark-string-end)
(go-mode-mark-string pos))
(get-text-property pos 'go-mode-string))
(defun go-mode-mark-string (end)
"Mark strings up to point END. Don't call this
directly; use `go-mode-in-string'."
(setq end (min end (point-max)))
(go-mode-parser
(save-match-data
(let ((pos
;; Back up to the last known state.
(let ((last-cs
(and (> go-mode-mark-string-end 1)
(get-text-property (1- go-mode-mark-string-end)
'go-mode-string))))
(if last-cs
(car last-cs)
(max 1 (1- go-mode-mark-string-end))))))
(while (< pos end)
(goto-char pos)
(let ((cs-end ; end of the text property
(cond
((looking-at "\"")
(goto-char (1+ pos))
(if (looking-at "[^\"\n\\\\]*\\(\\\\.[^\"\n\\\\]*\\)*\"")
(match-end 0)
(end-of-line)
(point)))
((looking-at "'")
(goto-char (1+ pos))
(if (looking-at "[^'\n\\\\]*\\(\\\\.[^'\n\\\\]*\\)*'")
(match-end 0)
(end-of-line)
(point)))
((looking-at "`")
(goto-char (1+ pos))
(while (if (search-forward "`" end t)
(if (eq (char-after) ?`)
(goto-char (1+ (point))))
(goto-char end)
nil))
(point)))))
(cond
(cs-end
(put-text-property pos cs-end 'go-mode-string (cons pos cs-end))
(setq pos cs-end))
((re-search-forward "[\"'`]" end t)
(setq pos (match-beginning 0)))
(t
(setq pos end)))))
(setq go-mode-mark-string-end pos)))))
(defun go-mode-font-lock-cs (limit comment)
"Helper function for highlighting comment/strings. If COMMENT is t,
set match data to the next comment after point, and advance point
after it. If COMMENT is nil, use the next string. Returns nil
if no further tokens of the type exist."
;; Ensures that `next-single-property-change' below will work properly.
(go-mode-cs limit)
(let (cs next (result 'scan))
(while (eq result 'scan)
(if (or (>= (point) limit) (eobp))
(setq result nil)
(setq cs (go-mode-cs))
(if (and cs (>= (car cs) (point)))
(if (eq (= (char-after (car cs)) ?/) comment)
;; If inside the expected comment/string, highlight it.
(progn
;; If the match includes a "\n", we have a
;; multi-line construct. Mark it as such.
(goto-char (car cs))
(when (search-forward "\n" (cdr cs) t)
(put-text-property
(car cs) (cdr cs) 'font-lock-multline t))
(set-match-data (list (car cs) (copy-marker (cdr cs))))
(goto-char (cdr cs))
(setq result t))
;; Wrong type. Look for next comment/string after this one.
(goto-char (cdr cs)))
;; Not inside comment/string. Search for next comment/string.
(setq next (next-single-property-change
(point) 'go-mode-cs nil limit))
(if (and next (< next limit))
(goto-char next)
(setq result nil)))))
result))
(defun go-mode-font-lock-cs-string (limit)
"Font-lock iterator for strings."
(go-mode-font-lock-cs limit nil))
(defun go-mode-font-lock-cs-comment (limit)
"Font-lock iterator for comments."
(go-mode-font-lock-cs limit t))
(defsubst go-mode-nesting (&optional pos)
"Return the nesting at point POS. The nesting is a list
of (START . END) pairs for all braces, parens, and brackets
surrounding POS, starting at the inner-most nesting. START is
the location of the open character. END is the location of the
close character or nil if the nesting scanner has not yet
encountered the close character."
(unless pos
(setq pos (point)))
(if (= pos 1)
'()
(when (> pos go-mode-mark-nesting-end)
(go-mode-mark-nesting pos))
(get-text-property (- pos 1) 'go-mode-nesting)))
(defun go-mode-mark-nesting (pos)
"Mark nesting up to point END. Don't call this directly; use
`go-mode-nesting'."
(go-mode-cs pos)
(go-mode-parser
;; Mark depth
(goto-char go-mode-mark-nesting-end)
(let ((nesting (go-mode-nesting))
(last (point)))
(while (< last pos)
;; Find the next depth-changing character
(skip-chars-forward "^(){}[]" pos)
;; Mark everything up to this character with the current
;; nesting
(put-text-property last (point) 'go-mode-nesting nesting)
(when nil
(let ((depth (length nesting)))
(put-text-property last (point) 'face
`((:background
,(format "gray%d" (* depth 10)))))))
(setq last (point))
;; Update nesting
(unless (eobp)
(let ((ch (unless (go-mode-cs) (char-after))))
(forward-char 1)
(case ch
((?\( ?\{ ?\[)
(setq nesting (cons (cons (- (point) 1) nil)
nesting)))
((?\) ?\} ?\])
(when nesting
(setcdr (car nesting) (- (point) 1))
(setq nesting (cdr nesting))))))))
;; Update state
(setq go-mode-mark-nesting-end last))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Indentation
;;
(defvar go-mode-non-terminating-keywords-regexp
(let* ((kws go-mode-keywords)
(kws (remove "break" kws))
(kws (remove "continue" kws))
(kws (remove "fallthrough" kws))
(kws (remove "return" kws)))
(regexp-opt kws 'words))
"Regular expression matching all Go keywords that *do not*
implicitly terminate a statement.")
(defun go-mode-semicolon-p ()
"True iff point immediately follows either an explicit or
implicit semicolon. Point should immediately follow the last
token on the line."
;; #Semicolons
(case (char-before)
((?\;) t)
;; String literal
((?' ?\" ?`) t)
;; One of the operators and delimiters ++, --, ), ], or }
((?+) (eq (char-before (1- (point))) ?+))
((?-) (eq (char-before (1- (point))) ?-))
((?\) ?\] ?\}) t)
;; An identifier or one of the keywords break, continue,
;; fallthrough, or return or a numeric literal
(otherwise
(save-excursion
(when (/= (skip-chars-backward "[:word:]_") 0)
(not (looking-at go-mode-non-terminating-keywords-regexp)))))))
(defun go-mode-whitespace-p (char)
"Is char whitespace in the syntax table for go."
(eq 32 (char-syntax char)))
(defun go-mode-backward-skip-comments ()
"Skip backward over comments and whitespace."
;; only proceed if point is in a comment or white space
(if (or (go-mode-in-comment)
(go-mode-whitespace-p (char-after (point))))
(let ((loop-guard t))
(while (and
loop-guard
(not (bobp)))
(cond ((go-mode-whitespace-p (char-after (point)))
;; moves point back over any whitespace
(re-search-backward "[^[:space:]]"))
((go-mode-in-comment)
;; move point to char preceeding current comment
(goto-char (1- (car (go-mode-in-comment)))))
;; not in a comment or whitespace? we must be done.
(t (setq loop-guard nil)
(forward-char 1)))))))
(defun go-mode-indentation ()
"Compute the ideal indentation level of the current line.
To the first order, this is the brace depth of the current line,
plus parens that follow certain keywords. case, default, and
labels are outdented one level, and continuation lines are
indented one level."
(save-excursion (save-excursion
(back-to-indentation) (let (start-nesting (outindent 0))
(let ((cs (go-mode-cs))) (back-to-indentation)
;; Treat comments and strings differently only if the beginning (setq start-nesting (go-paren-level))
;; of the line is contained within them
(when (and cs (= (point) (car cs)))
(setq cs nil))
;; What type of context am I in?
(cond (cond
((and cs (save-excursion ((go-in-string-p)
(goto-char (car cs)) (current-indentation))
(looking-at "`"))) ((looking-at "[])}]")
;; Inside a multi-line string. Don't mess with indentation. (go-goto-opening-parenthesis (char-after))
nil) (if (go-previous-line-has-dangling-op-p)
(cs (- (current-indentation) tab-width)
;; Inside a general comment (current-indentation)))
(goto-char (car cs)) ((progn (go--backward-irrelevant t) (looking-back go-dangling-operators-regexp))
(forward-char 1) ;; only one nesting for all dangling operators in one operation
(current-column)) (if (go-previous-line-has-dangling-op-p)
(current-indentation)
(+ (current-indentation) tab-width)))
((zerop (go-paren-level))
0)
((progn (go-goto-opening-parenthesis) (< (go-paren-level) start-nesting))
(if (go-previous-line-has-dangling-op-p)
(current-indentation)
(+ (current-indentation) tab-width)))
(t (t
;; Not in a multi-line string or comment (current-indentation))))))
(let ((indent 0)
(inside-indenting-paren nil))
;; Count every enclosing brace, plus parens that follow
;; import, const, var, or type and indent according to
;; depth. This simple rule does quite well, but also has a
;; very large extent. It would be better if we could mimic
;; some nearby indentation.
(save-excursion
(skip-chars-forward "})")
(let ((first t))
(dolist (nest (go-mode-nesting))
(case (char-after (car nest))
((?\{)
(incf indent tab-width))
((?\()
(goto-char (car nest))
(go-mode-backward-skip-comments)
(backward-char)
;; Really just want the token before
(when (looking-back "\\<import\\|const\\|var\\|type\\|package"
(max (- (point) 7) (point-min)))
(incf indent tab-width)
(when first
(setq inside-indenting-paren t)))))
(setq first nil))))
;; case, default, and labels are outdented 1 level
(when (looking-at "\\<case\\>\\|\\<default\\>\\|\\w+\\s *:\\(\\S.\\|$\\)")
(decf indent tab-width))
(when (looking-at "\\w+\\s *:.+,\\s *$")
(incf indent tab-width))
;; Continuation lines are indented 1 level
(beginning-of-line) ; back up to end of previous line
(backward-char)
(go-mode-backward-skip-comments) ; back up past any comments
(when (case (char-before)
((nil ?\{ ?:)
;; At the beginning of a block or the statement
;; following a label.
nil)
((?\()
;; Usually a continuation line in an expression,
;; unless this paren is part of a factored
;; declaration.
(not inside-indenting-paren))
((?,)
;; Could be inside a literal. We're a little
;; conservative here and consider any comma within
;; curly braces (as opposed to parens) to be a
;; literal separator. This will fail to recognize
;; line-breaks in parallel assignments as
;; continuation lines.
(let ((depth (go-mode-nesting)))
(and depth
(not (eq (char-after (caar depth)) ?\{)))))
(t
;; We're in the middle of a block. Did the
;; previous line end with an implicit or explicit
;; semicolon?
(not (go-mode-semicolon-p))))
(incf indent tab-width))
(max indent 0)))))))
(defun go-mode-indent-line () (defun go-mode-indent-line ()
"Indent the current line according to `go-mode-indentation'."
(interactive) (interactive)
(let (indent
;; turn off case folding to distinguish keywords from identifiers shift-amt
;; e.g. "default" is a keyword; "Default" can be a variable name. end
(let ((case-fold-search nil)) (pos (- (point-max) (point)))
(let ((col (go-mode-indentation))) (point (point))
(when col (beg (line-beginning-position)))
(let ((offset (- (current-column) (current-indentation)))) (back-to-indentation)
(indent-line-to col) (if (go-in-string-or-comment-p)
(when (> offset 0) (goto-char point)
(forward-char offset))))))) (setq indent (go-indentation-at-point))
(if (looking-at (concat go-label-regexp ":\\([[:space:]]*/.+\\)?$\\|case .+:\\|default:"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; (decf indent tab-width))
;; Go mode (setq shift-amt (- indent (current-column)))
;; (if (zerop shift-amt)
nil
(delete-region beg (point))
(indent-to indent))
;; If initial point was within line's indentation,
;; position after the indentation. Else stay at same point in text.
(if (> (- (point-max) pos) (point))
(goto-char (- (point-max) pos))))))
(defun go-beginning-of-defun (&optional count)
(unless count (setq count 1))
(let ((first t) failure)
(dotimes (i (abs count))
(while (and (not failure)
(or first (go-in-string-or-comment-p)))
(if (>= count 0)
(progn
(go--backward-irrelevant)
(if (not (re-search-backward go-func-meth-regexp nil t))
(setq failure t)))
(if (looking-at go-func-meth-regexp)
(forward-char))
(if (not (re-search-forward go-func-meth-regexp nil t))
(setq failure t)))
(setq first nil)))
(if (< count 0)
(beginning-of-line))
(not failure)))
(defun go-end-of-defun ()
(let (orig-level)
;; It can happen that we're not placed before a function by emacs
(if (not (looking-at "func"))
(go-beginning-of-defun -1))
(skip-chars-forward "^{")
(forward-char)
(setq orig-level (go-paren-level))
(while (>= (go-paren-level) orig-level)
(skip-chars-forward "^}")
(forward-char))))
;;;###autoload ;;;###autoload
(define-derived-mode go-mode nil "Go" (define-derived-mode go-mode fundamental-mode "Go"
"Major mode for editing Go source text. "Major mode for editing Go source text.
This provides basic syntax highlighting for keywords, built-ins, This mode provides (not just) basic editing capabilities for
functions, and some types. It also provides indentation that is working with Go code. It offers almost complete syntax
\(almost) identical to gofmt." highlighting, indentation that is almost identical to gofmt and
proper parsing of the buffer content to allow features such as
navigation by function, manipulation of comments or detection of
strings.
In addition to these core features, it offers various features to
help with writing Go code. You can directly run buffer content
through gofmt, read godoc documentation from within Emacs, modify
and clean up the list of package imports or interact with the
Playground (uploading and downloading pastes).
The following extra functions are defined:
- `gofmt'
- `godoc'
- `go-import-add'
- `go-remove-unused-imports'
- `go-goto-imports'
- `go-play-buffer' and `go-play-region'
- `go-download-play'
If you want to automatically run `gofmt' before saving a file,
add the following hook to your emacs configuration:
\(add-hook 'before-save-hook 'gofmt-before-save)
If you're looking for even more integration with Go, namely
on-the-fly syntax checking, auto-completion and snippets, it is
recommended that you look at goflymake
\(https://github.com/dougm/goflymake), gocode
\(https://github.com/nsf/gocode) and yasnippet-go
\(https://github.com/dominikh/yasnippet-go)"
;; Font lock ;; Font lock
(set (make-local-variable 'font-lock-defaults) (set (make-local-variable 'font-lock-defaults)
'(go-mode-font-lock-keywords nil nil nil nil)) '(go--build-font-lock-keywords))
;; Remove stale text properties
(save-restriction
(widen)
(let ((modified (buffer-modified-p)))
(remove-text-properties 1 (point-max)
'(go-mode-cs nil go-mode-nesting nil))
;; remove-text-properties marks the buffer modified. undo that if it
;; wasn't originally marked modified.
(set-buffer-modified-p modified)))
;; Reset the syntax mark caches
(setq go-mode-mark-cs-end 1
go-mode-mark-nesting-end 1)
(add-hook 'before-change-functions #'go-mode-mark-clear-cache nil t)
(add-hook 'after-change-functions #'go-mode-mark-clear-cs nil t)
;; Indentation ;; Indentation
(set (make-local-variable 'indent-line-function) (set (make-local-variable 'indent-line-function) 'go-mode-indent-line)
#'go-mode-indent-line)
(add-hook 'after-change-functions #'go-mode-delayed-electric-hook nil t)
;; Comments ;; Comments
(set (make-local-variable 'comment-start) "// ") (set (make-local-variable 'comment-start) "// ")
(set (make-local-variable 'comment-end) "") (set (make-local-variable 'comment-end) "")
(set (make-local-variable 'comment-use-syntax) nil) (set (make-local-variable 'comment-use-syntax) t)
(set (make-local-variable 'comment-start-skip) "\\([ \t]*\\)// ") (set (make-local-variable 'comment-start-skip) "\\(//+\\|/\\*+\\)\\s *")
(set (make-local-variable 'beginning-of-defun-function) 'go-beginning-of-defun)
(set (make-local-variable 'end-of-defun-function) 'go-end-of-defun)
(set (make-local-variable 'parse-sexp-lookup-properties) t)
(if (boundp 'syntax-propertize-function)
(set (make-local-variable 'syntax-propertize-function) 'go-propertize-syntax))
(set (make-local-variable 'go-dangling-cache) (make-hash-table :test 'eql))
(add-hook 'before-change-functions (lambda (x y) (setq go-dangling-cache (make-hash-table :test 'eql))) t t)
(setq imenu-generic-expression
'(("type" "^type *\\([^ \t\n\r\f]*\\)" 1)
("func" "^func *\\(.*\\) {" 1)))
(imenu-add-to-menubar "Index")
;; Go style ;; Go style
(setq indent-tabs-mode t) (setq indent-tabs-mode t)
...@@ -737,24 +352,14 @@ functions, and some types. It also provides indentation that is ...@@ -737,24 +352,14 @@ functions, and some types. It also provides indentation that is
;; those alists are traversed in *reverse* order: ;; those alists are traversed in *reverse* order:
;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2001-12/msg00674.html ;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2001-12/msg00674.html
(when (and (boundp 'compilation-error-regexp-alist) (when (and (boundp 'compilation-error-regexp-alist)
(boundp 'compilation-error-regexp-alist-alist)) (boundp 'compilation-error-regexp-alist-alist))
(add-to-list 'compilation-error-regexp-alist 'go-test t) (add-to-list 'compilation-error-regexp-alist 'go-test t)
(add-to-list 'compilation-error-regexp-alist-alist (add-to-list 'compilation-error-regexp-alist-alist
'(go-test . ("^\t+\\([^()\t\n]+\\):\\([0-9]+\\):? .*$" 1 2)) t))) '(go-test . ("^\t+\\([^()\t\n]+\\):\\([0-9]+\\):? .*$" 1 2)) t)))
;;;###autoload ;;;###autoload
(add-to-list 'auto-mode-alist (cons "\\.go$" #'go-mode)) (add-to-list 'auto-mode-alist (cons "\\.go\\'" 'go-mode))
(defun go-mode-reload ()
"Reload go-mode.el and put the current buffer into Go mode.
Useful for development work."
(interactive)
(unload-feature 'go-mode)
(require 'go-mode)
(go-mode))
;;;###autoload
(defun gofmt () (defun gofmt ()
"Pipe the current buffer through the external tool `gofmt`. "Pipe the current buffer through the external tool `gofmt`.
Replace the current buffer on success; display errors on failure." Replace the current buffer on success; display errors on failure."
...@@ -766,89 +371,103 @@ Replace the current buffer on success; display errors on failure." ...@@ -766,89 +371,103 @@ Replace the current buffer on success; display errors on failure."
(patchbuf (get-buffer-create "*Gofmt patch*"))) (patchbuf (get-buffer-create "*Gofmt patch*")))
(with-current-buffer patchbuf (with-current-buffer patchbuf
(let ((errbuf (get-buffer-create "*Gofmt Errors*")) (let ((errbuf (get-buffer-create "*Gofmt Errors*"))
(coding-system-for-read 'utf-8) ;; use utf-8 with subprocesses ;; use utf-8 with subprocesses
(coding-system-for-read 'utf-8)
(coding-system-for-write 'utf-8)) (coding-system-for-write 'utf-8))
(with-current-buffer errbuf (with-current-buffer errbuf
(toggle-read-only 0) (setq buffer-read-only nil)
(erase-buffer)) (erase-buffer))
(with-current-buffer srcbuf (with-current-buffer srcbuf
(save-restriction (save-restriction
(let (deactivate-mark) (let (deactivate-mark)
(widen) (widen)
; If this is a new file, diff-mode can't apply a ;; If this is a new file, diff-mode can't apply a
; patch to a non-exisiting file, so replace the buffer ;; patch to a non-exisiting file, so replace the buffer
; completely with the output of 'gofmt'. ;; completely with the output of 'gofmt'.
; If the file exists, patch it to keep the 'undo' list happy. ;; If the file exists, patch it to keep the 'undo' list happy.
(let* ((newfile (not (file-exists-p filename))) (let* ((newfile (not (file-exists-p filename)))
(flag (if newfile "" " -d"))) (flag (if newfile "" " -d")))
(if (= 0 (shell-command-on-region (point-min) (point-max)
(concat "gofmt" flag) ;; diff-mode doesn't work too well with missing
patchbuf nil errbuf)) ;; end-of-file newline, so add one
; gofmt succeeded: replace buffer or apply patch hunks. (if (/= (char-after (1- (point-max))) ?\n)
(save-excursion
(goto-char (point-max))
(insert ?\n)))
(if (zerop (shell-command-on-region (point-min) (point-max)
(concat "gofmt" flag)
patchbuf nil errbuf))
;; gofmt succeeded: replace buffer or apply patch hunks.
(let ((old-point (point)) (let ((old-point (point))
(old-mark (mark t))) (old-mark (mark t)))
(kill-buffer errbuf) (kill-buffer errbuf)
(if newfile (if newfile
; New file, replace it (diff-mode won't work) ;; New file, replace it (diff-mode won't work)
(gofmt-replace-buffer srcbuf patchbuf) (gofmt--replace-buffer srcbuf patchbuf)
; Existing file, patch it ;; Existing file, patch it
(gofmt-apply-patch filename srcbuf patchbuf)) (gofmt--apply-patch filename srcbuf patchbuf))
(goto-char (min old-point (point-max))) (goto-char (min old-point (point-max)))
;; Restore the mark and point ;; Restore the mark and point
(if old-mark (push-mark (min old-mark (point-max)) t)) (if old-mark (push-mark (min old-mark (point-max)) t))
(set-window-configuration currconf)) (set-window-configuration currconf))
;; gofmt failed: display the errors ;; gofmt failed: display the errors
(gofmt-process-errors filename errbuf)))))) (message "Could not apply gofmt. Check errors for details")
(gofmt--process-errors filename errbuf))))))
;; Collapse any window opened on outbuf if shell-command-on-region ;; Collapse any window opened on outbuf if shell-command-on-region
;; displayed it. ;; displayed it.
(delete-windows-on patchbuf))) (delete-windows-on patchbuf)))
(kill-buffer patchbuf)))) (kill-buffer patchbuf))))
(defun gofmt-replace-buffer (srcbuf patchbuf) (defun gofmt--replace-buffer (srcbuf patchbuf)
(with-current-buffer srcbuf (with-current-buffer srcbuf
(erase-buffer) (erase-buffer)
(insert-buffer-substring patchbuf))) (insert-buffer-substring patchbuf))
(message "Applied gofmt"))
(defconst gofmt-stdin-tag "<standard input>") (defun gofmt--apply-patch (filename srcbuf patchbuf)
(defun gofmt-apply-patch (filename srcbuf patchbuf)
(require 'diff-mode)
;; apply all the patch hunks ;; apply all the patch hunks
(with-current-buffer patchbuf (let (changed)
(goto-char (point-min)) (with-current-buffer patchbuf
;; The .* is for TMPDIR, but to avoid dealing with TMPDIR (goto-char (point-min))
;; having a trailing / or not, it's easier to just search for .* ;; The .* is for TMPDIR, but to avoid dealing with TMPDIR
;; especially as we're only replacing the first instance. ;; having a trailing / or not, it's easier to just search for .*
(if (re-search-forward "^--- \\(.*/gofmt[0-9]*\\)" nil t) ;; especially as we're only replacing the first instance.
(replace-match filename nil nil nil 1)) (if (re-search-forward "^--- \\(.*/gofmt[0-9]*\\)" nil t)
(condition-case nil (replace-match filename nil nil nil 1))
(while t (condition-case nil
(diff-hunk-next) (while t
(diff-apply-hunk)) (diff-hunk-next)
;; When there's no more hunks, diff-hunk-next signals an error, ignore it (diff-apply-hunk)
(error nil)))) (setq changed t))
;; When there's no more hunks, diff-hunk-next signals an error, ignore it
(defun gofmt-process-errors (filename errbuf) (error nil)))
(if changed (message "Applied gofmt") (message "Buffer was already gofmted"))))
(defun gofmt--process-errors (filename errbuf)
;; Convert the gofmt stderr to something understood by the compilation mode. ;; Convert the gofmt stderr to something understood by the compilation mode.
(with-current-buffer errbuf (with-current-buffer errbuf
(goto-char (point-min)) (goto-char (point-min))
(insert "gofmt errors:\n") (insert "gofmt errors:\n")
(if (search-forward gofmt-stdin-tag nil t) (if (search-forward gofmt-stdin-tag nil t)
(replace-match (file-name-nondirectory filename) nil t)) (replace-match (file-name-nondirectory filename) nil t))
(display-buffer errbuf) (display-buffer errbuf)
(compilation-mode))) (compilation-mode)))
;;;###autoload ;;;###autoload
(defun gofmt-before-save () (defun gofmt-before-save ()
"Add this to .emacs to run gofmt on the current buffer when saving: "Add this to .emacs to run gofmt on the current buffer when saving:
(add-hook 'before-save-hook #'gofmt-before-save)" (add-hook 'before-save-hook 'gofmt-before-save).
Note that this will cause go-mode to get loaded the first time
you save any file, kind of defeating the point of autoloading."
(interactive) (interactive)
(when (eq major-mode 'go-mode) (gofmt))) (when (eq major-mode 'go-mode) (gofmt)))
(defun godoc-read-query () (defun godoc--read-query ()
"Read a godoc query from the minibuffer." "Read a godoc query from the minibuffer."
;; Compute the default query as the symbol under the cursor. ;; Compute the default query as the symbol under the cursor.
;; TODO: This does the wrong thing for e.g. multipart.NewReader (it only grabs ;; TODO: This does the wrong thing for e.g. multipart.NewReader (it only grabs
...@@ -862,7 +481,7 @@ Replace the current buffer on success; display errors on failure." ...@@ -862,7 +481,7 @@ Replace the current buffer on success; display errors on failure."
"godoc: ") "godoc: ")
nil nil symbol))) nil nil symbol)))
(defun godoc-get-buffer (query) (defun godoc--get-buffer (query)
"Get an empty buffer for a godoc query." "Get an empty buffer for a godoc query."
(let* ((buffer-name (concat "*godoc " query "*")) (let* ((buffer-name (concat "*godoc " query "*"))
(buffer (get-buffer buffer-name))) (buffer (get-buffer buffer-name)))
...@@ -870,13 +489,14 @@ Replace the current buffer on success; display errors on failure." ...@@ -870,13 +489,14 @@ Replace the current buffer on success; display errors on failure."
(when buffer (kill-buffer buffer)) (when buffer (kill-buffer buffer))
(get-buffer-create buffer-name))) (get-buffer-create buffer-name)))
(defun godoc-buffer-sentinel (proc event) (defun godoc--buffer-sentinel (proc event)
"Sentinel function run when godoc command completes." "Sentinel function run when godoc command completes."
(with-current-buffer (process-buffer proc) (with-current-buffer (process-buffer proc)
(cond ((string= event "finished\n") ;; Successful exit. (cond ((string= event "finished\n") ;; Successful exit.
(goto-char (point-min)) (goto-char (point-min))
(view-buffer (current-buffer) 'kill-buffer)) (view-mode 1)
((not (= (process-exit-status proc) 0)) ;; Error exit. (display-buffer (current-buffer) t))
((/= (process-exit-status proc) 0) ;; Error exit.
(let ((output (buffer-string))) (let ((output (buffer-string)))
(kill-buffer (current-buffer)) (kill-buffer (current-buffer))
(message (concat "godoc: " output))))))) (message (concat "godoc: " output)))))))
...@@ -884,12 +504,217 @@ Replace the current buffer on success; display errors on failure." ...@@ -884,12 +504,217 @@ Replace the current buffer on success; display errors on failure."
;;;###autoload ;;;###autoload
(defun godoc (query) (defun godoc (query)
"Show go documentation for a query, much like M-x man." "Show go documentation for a query, much like M-x man."
(interactive (list (godoc-read-query))) (interactive (list (godoc--read-query)))
(unless (string= query "") (unless (string= query "")
(set-process-sentinel (set-process-sentinel
(start-process-shell-command "godoc" (godoc-get-buffer query) (start-process-shell-command "godoc" (godoc--get-buffer query)
(concat "godoc " query)) (concat "godoc " query))
'godoc-buffer-sentinel) 'godoc--buffer-sentinel)
nil)) nil))
(defun go-goto-imports ()
"Move point to the block of imports.
If using
import (
\"foo\"
\"bar\"
)
it will move point directly behind the last import.
If using
import \"foo\"
import \"bar\"
it will move point to the next line after the last import.
If no imports can be found, point will be moved after the package
declaration."
(interactive)
;; FIXME if there's a block-commented import before the real
;; imports, we'll jump to that one.
;; Generally, this function isn't very forgiving. it'll bark on
;; extra whitespace. It works well for clean code.
(let ((old-point (point)))
(goto-char (point-min))
(cond
((re-search-forward "^import ([^)]+)" nil t)
(backward-char 2)
'block)
((re-search-forward "\\(^import \\([^\"]+ \\)?\"[^\"]+\"\n?\\)+" nil t)
'single)
((re-search-forward "^[[:space:]\n]*package .+?\n" nil t)
(message "No imports found, moving point after package declaration")
'none)
(t
(goto-char old-point)
(message "No imports or package declaration found. Is this really a Go file?")
'fail))))
(defun go-play-buffer ()
"Like `go-play-region', but acts on the entire buffer."
(interactive)
(go-play-region (point-min) (point-max)))
(defun go-play-region (start end)
"Send the region to the Playground and stores the resulting
link in the kill ring."
(interactive "r")
(let* ((url-request-method "POST")
(url-request-extra-headers
'(("Content-Type" . "application/x-www-form-urlencoded")))
(url-request-data (buffer-substring-no-properties start end))
(content-buf (url-retrieve
"http://play.golang.org/share"
(lambda (arg)
(cond
((equal :error (car arg))
(signal 'go-play-error (cdr arg)))
(t
(re-search-forward "\n\n")
(kill-new (format "http://play.golang.org/p/%s" (buffer-substring (point) (point-max))))
(message "http://play.golang.org/p/%s" (buffer-substring (point) (point-max)))))))))))
;;;###autoload
(defun go-download-play (url)
"Downloads a paste from the playground and inserts it in a Go
buffer. Tries to look for a URL at point."
(interactive (list (read-from-minibuffer "Playground URL: " (ffap-url-p (ffap-string-at-point 'url)))))
(with-current-buffer
(let ((url-request-method "GET") url-request-data url-request-extra-headers)
(url-retrieve-synchronously (concat url ".go")))
(let ((buffer (generate-new-buffer (concat (car (last (split-string url "/"))) ".go"))))
(goto-char (point-min))
(re-search-forward "\n\n")
(copy-to-buffer buffer (point) (point-max))
(kill-buffer)
(with-current-buffer buffer
(go-mode)
(switch-to-buffer buffer)))))
(defun go-propertize-syntax (start end)
(save-excursion
(goto-char start)
(while (search-forward "\\" end t)
(put-text-property (1- (point)) (point) 'syntax-table (if (= (char-after) ?`) '(1) '(9))))))
;; ;; Commented until we actually make use of this function
;; (defun go--common-prefix (sequences)
;; ;; mismatch and reduce are cl
;; (assert sequences)
;; (flet ((common-prefix (s1 s2)
;; (let ((diff-pos (mismatch s1 s2)))
;; (if diff-pos (subseq s1 0 diff-pos) s1))))
;; (reduce #'common-prefix sequences)))
(defun go-import-add (arg import)
"Add a new import to the list of imports.
When called with a prefix argument asks for an alternative name
to import the package as.
If no list exists yet, one will be created if possible.
If an identical import has been commented, it will be
uncommented, otherwise a new import will be added."
;; - If there's a matching `// import "foo"`, uncomment it
;; - If we're in an import() block and there's a matching `"foo"`, uncomment it
;; - Otherwise add a new import, with the appropriate syntax
(interactive
(list
current-prefix-arg
(replace-regexp-in-string "^[\"']\\|[\"']$" "" (completing-read "Package: " (go-packages)))))
(save-excursion
(let (as line import-start)
(if arg
(setq as (read-from-minibuffer "Import as: ")))
(if as
(setq line (format "%s \"%s\"" as import))
(setq line (format "\"%s\"" import)))
(goto-char (point-min))
(if (re-search-forward (concat "^[[:space:]]*//[[:space:]]*import " line "$") nil t)
(uncomment-region (line-beginning-position) (line-end-position))
(case (go-goto-imports)
('fail (message "Could not find a place to add import."))
('block
(save-excursion
(re-search-backward "^import (")
(setq import-start (point)))
(if (re-search-backward (concat "^[[:space:]]*//[[:space:]]*" line "$") import-start t)
(uncomment-region (line-beginning-position) (line-end-position))
(insert "\n\t" line)))
('single (insert "import " line "\n"))
('none (insert "\nimport (\n\t" line "\n)\n")))))))
(defun go-root-and-paths ()
(let* ((output (process-lines "go" "env" "GOROOT" "GOPATH"))
(root (car output))
(paths (split-string (car (cdr output)) ":")))
(append (list root) paths)))
(defun go-packages ()
(sort
(delete-dups
(mapcan
(lambda (topdir)
(let ((pkgdir (concat topdir "/pkg/")))
(mapcan (lambda (dir)
(mapcar (lambda (file)
(let ((sub (substring file (length pkgdir) -2)))
(unless (or (string-prefix-p "obj/" sub) (string-prefix-p "tool/" sub))
(mapconcat 'identity (cdr (split-string sub "/")) "/"))))
(if (file-directory-p dir)
(directory-files dir t "\\.a$"))))
(if (file-directory-p pkgdir)
(find-lisp-find-files-internal pkgdir 'find-lisp-file-predicate-is-directory 'find-lisp-default-directory-predicate)))))
(go-root-and-paths)))
'string<))
(defun go-unused-imports-lines ()
;; FIXME Technically, -o /dev/null fails in quite some cases (on
;; Windows, when compiling from within GOPATH). Practically,
;; however, it has the same end result: There won't be a
;; compiled binary/archive, and we'll get our import errors when
;; there are any.
(reverse (remove nil
(mapcar
(lambda (line)
(if (string-match "^\\(.+\\):\\([[:digit:]]+\\): imported and not used: \".+\"$" line)
(if (string= (file-truename (match-string 1 line)) (file-truename buffer-file-name))
(string-to-number (match-string 2 line)))))
(split-string (shell-command-to-string
(if (string-match "_test\.go$" buffer-file-truename)
"go test -c"
"go build -o /dev/null")) "\n")))))
(defun go-remove-unused-imports (arg)
"Removes all unused imports. If ARG is non-nil, unused imports
will be commented, otherwise they will be removed completely."
(interactive "P")
(save-excursion
(let ((cur-buffer (current-buffer)) flymake-state lines)
(when (boundp 'flymake-mode)
(setq flymake-state flymake-mode)
(flymake-mode-off))
(save-some-buffers nil (lambda () (equal cur-buffer (current-buffer))))
(if (buffer-modified-p)
(message "Cannot operate on unsaved buffer")
(setq lines (go-unused-imports-lines))
(dolist (import lines)
(goto-char (point-min))
(forward-line (1- import))
(beginning-of-line)
(if arg
(comment-region (line-beginning-position) (line-end-position))
(let ((kill-whole-line t))
(kill-line))))
(message "Removed %d imports" (length lines)))
(if flymake-state (flymake-mode-on)))))
(provide 'go-mode) (provide 'go-mode)
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