go/printer: replace multiline logic

This CL mostly deletes code.

Using existing position information is
just as good to determine if a new section
is needed; no need to track exact multi-
line information. Eliminates the need to
carry around a multiLine parameter with
practically every function.

Applied gofmt -w src misc resulting in only
a minor change to godoc.go. In return, a couple
of test cases are now formatted better.

Not Go1-required, but nice-to-have as it will
simplify fixes going forward.

R=rsc
CC=golang-dev
https://golang.org/cl/5706055

src/cmd/godoc/godoc.go

@@ -69,7 +69,7 @@ var (
 	// search index
 	indexEnabled = flag.Bool("index", false, "enable search index")
 	indexFiles   = flag.String("index_files", "", "glob pattern specifying index files;"+
-		"if not empty, the index is read from these files in sorted order")
+			"if not empty, the index is read from these files in sorted order")
 	maxResults    = flag.Int("maxresults", 10000, "maximum number of full text search results shown")
 	indexThrottle = flag.Float64("index_throttle", 0.75, "index throttle value; 0.0 = no time allocated, 1.0 = full throttle")
 

src/pkg/go/printer/printer.go

@@ -34,9 +34,6 @@ const (
 	unindent = whiteSpace('<')
 )
 
-// Use ignoreMultiLine if the multiLine information is not important.
-var ignoreMultiLine = new(bool)
-
 // A pmode value represents the current printer mode.
 type pmode int
 
@@ -1011,18 +1008,18 @@ func (p *printer) printNode(node interface{}) error {
 	// format node
 	switch n := node.(type) {
 	case ast.Expr:
-		p.expr(n, ignoreMultiLine)
+		p.expr(n)
 	case ast.Stmt:
 		// A labeled statement will un-indent to position the
 		// label. Set indent to 1 so we don't get indent "underflow".
 		if _, labeledStmt := n.(*ast.LabeledStmt); labeledStmt {
 			p.indent = 1
 		}
-		p.stmt(n, false, ignoreMultiLine)
+		p.stmt(n, false)
 	case ast.Decl:
-		p.decl(n, ignoreMultiLine)
+		p.decl(n)
 	case ast.Spec:
-		p.spec(n, 1, false, ignoreMultiLine)
+		p.spec(n, 1, false)
 	case *ast.File:
 		p.file(n)
 	default:

src/pkg/go/printer/testdata/declarations.golden

@@ -500,7 +500,7 @@ type _ struct {
 
 type _ struct {
 	a, b,
-	c, d	int	// this line should be indented
+	c, d		int	// this line should be indented
 	u, v, w, x	float	// this line should be indented
 	p, q,
 	r, s	float	// this line should be indented
@@ -562,7 +562,7 @@ var a2, b2,
 
 var (
 	a3, b3,
-	c3, d3	int	// this line should be indented
+	c3, d3		int	// this line should be indented
 	a4, b4, c4	int	// this line should be indented
 )