mirror of
https://github.com/golang/go
synced 2024-11-25 07:47:56 -07:00
70ed0ac588
Instead of syntax-tables, an extended go-mode-cs is used for from a font-lock callback. Cache invalidation must happen in a before-change-function because font-lock runs in an after-change-function, potentially before the cache invalidation takes place. Performance is reasonable, even with src/pkg/html/entity.go and test/fixedbugs/bug257.go. Fixes #2330. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/5529045
651 lines
23 KiB
EmacsLisp
651 lines
23 KiB
EmacsLisp
;;; go-mode.el --- Major mode for the Go programming language
|
|
|
|
;;; Commentary:
|
|
|
|
;; For installation instructions, see go-mode-load.el
|
|
|
|
;;; To do:
|
|
|
|
;; * Indentation is *almost* identical to gofmt
|
|
;; ** 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:
|
|
|
|
(eval-when-compile (require 'cl))
|
|
|
|
(defvar go-mode-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)
|
|
|
|
;; Strings and comments are font-locked separately.
|
|
(modify-syntax-entry ?\" "." st)
|
|
(modify-syntax-entry ?\' "." st)
|
|
(modify-syntax-entry ?` "." st)
|
|
(modify-syntax-entry ?\\ "." st)
|
|
|
|
st)
|
|
"Syntax table for Go mode.")
|
|
|
|
(defvar 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 and
|
|
some syntax analysis.")
|
|
|
|
(defvar go-mode-font-lock-keywords
|
|
(let ((builtins '("append" "cap" "close" "complex" "copy" "delete" "imag" "len"
|
|
"make" "new" "panic" "print" "println" "real" "recover"))
|
|
(constants '("nil" "true" "false" "iota"))
|
|
(type-name "\\s *\\(?:[*(]\\s *\\)*\\(?:\\w+\\s *\\.\\s *\\)?\\(\\w+\\)")
|
|
)
|
|
`((go-mode-font-lock-cs-comment 0 font-lock-comment-face t)
|
|
(go-mode-font-lock-cs-string 0 font-lock-string-face t)
|
|
(,(regexp-opt go-mode-keywords 'words) . font-lock-keyword-face)
|
|
(,(regexp-opt builtins 'words) . font-lock-builtin-face)
|
|
(,(regexp-opt constants 'words) . font-lock-constant-face)
|
|
;; Function names in declarations
|
|
("\\<func\\>\\s *\\(\\w+\\)" 1 font-lock-function-name-face)
|
|
;; Function names in methods are handled by function call pattern
|
|
;; Function names in calls
|
|
;; XXX Doesn't match if function name is surrounded by parens
|
|
("\\(\\w+\\)\\s *(" 1 font-lock-function-name-face)
|
|
;; Type names
|
|
("\\<type\\>\\s *\\(\\w+\\)" 1 font-lock-type-face)
|
|
(,(concat "\\<type\\>\\s *\\w+\\s *" type-name) 1 font-lock-type-face)
|
|
;; 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
|
|
(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-delayed-electric)
|
|
;; In case we get : indentation wrong, correct ourselves
|
|
(define-key m "=" #'go-mode-insert-and-indent)
|
|
m)
|
|
"Keymap used by Go mode to implement electric keys.")
|
|
|
|
(defun go-mode-insert-and-indent (key)
|
|
"Invoke the global binding of KEY, then reindent the line."
|
|
|
|
(interactive (list (this-command-keys)))
|
|
(call-interactively (lookup-key (current-global-map) key))
|
|
(indent-according-to-mode))
|
|
|
|
(defvar go-mode-delayed-point nil
|
|
"The point following the previous insertion if the insertion
|
|
was a delayed electric key. Used to communicate between
|
|
`go-mode-delayed-electric' and `go-mode-delayed-electric-hook'.")
|
|
(make-variable-buffer-local 'go-mode-delayed-point)
|
|
|
|
(defun go-mode-delayed-electric (p)
|
|
"Perform electric insertion, but delayed by one event.
|
|
|
|
This inserts P into the buffer, as usual, then waits for another key.
|
|
If that second key causes a buffer modification starting at the
|
|
point after the insertion of P, reindents the line containing P."
|
|
|
|
(interactive "p")
|
|
(self-insert-command p)
|
|
(setq go-mode-delayed-point (point)))
|
|
|
|
(defun go-mode-delayed-electric-hook (b e l)
|
|
"An after-change-function that implements `go-mode-delayed-electric'."
|
|
|
|
(when (and go-mode-delayed-point
|
|
(= go-mode-delayed-point b))
|
|
(save-excursion
|
|
(save-match-data
|
|
(goto-char go-mode-delayed-point)
|
|
(indent-according-to-mode))))
|
|
(setq go-mode-delayed-point nil))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; Parser
|
|
;;
|
|
|
|
(defvar go-mode-mark-cs-end 1
|
|
"The point at which the comment/string cache ends. The buffer
|
|
will be marked from the beginning up to this point (that is, up
|
|
to and including character (1- go-mode-mark-cs-end)).")
|
|
(make-variable-buffer-local 'go-mode-mark-cs-end)
|
|
|
|
(defvar go-mode-mark-nesting-end 1
|
|
"The point at which the nesting cache ends. The buffer will be
|
|
marked from the beginning up to this point.")
|
|
(make-variable-buffer-local 'go-mode-mark-nesting-end)
|
|
|
|
(defun go-mode-mark-clear-cache (b e)
|
|
"A before-change-function that clears the comment/string and
|
|
nesting caches from the modified point on."
|
|
|
|
(save-restriction
|
|
(widen)
|
|
(when (<= b go-mode-mark-cs-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-cs)))
|
|
(if cs (car cs) b))))
|
|
(remove-text-properties
|
|
b (min go-mode-mark-cs-end (point-max)) '(go-mode-cs nil))
|
|
(setq go-mode-mark-cs-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 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)
|
|
(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-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 cs
|
|
(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) (cdr cs) (current-buffer)))
|
|
(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-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
|
|
(back-to-indentation)
|
|
(let ((cs (go-mode-cs)))
|
|
;; Treat comments and strings differently only if the beginning
|
|
;; of the line is contained within them
|
|
(when (and cs (= (point) (car cs)))
|
|
(setq cs nil))
|
|
;; What type of context am I in?
|
|
(cond
|
|
((and cs (save-excursion
|
|
(goto-char (car cs))
|
|
(looking-at "\\s\"")))
|
|
;; Inside a multi-line string. Don't mess with indentation.
|
|
nil)
|
|
(cs
|
|
;; Inside a general comment
|
|
(goto-char (car cs))
|
|
(forward-char 1)
|
|
(current-column))
|
|
(t
|
|
;; Not in a multi-line string or comment
|
|
(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))
|
|
(forward-comment (- (buffer-size)))
|
|
;; Really just want the token before
|
|
(when (looking-back "\\<import\\|const\\|var\\|type"
|
|
(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))
|
|
|
|
;; Continuation lines are indented 1 level
|
|
(forward-comment (- (buffer-size)))
|
|
(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 ()
|
|
"Indent the current line according to `go-mode-indentation'."
|
|
(interactive)
|
|
|
|
(let ((col (go-mode-indentation)))
|
|
(when col
|
|
(let ((offset (- (current-column) (current-indentation))))
|
|
(indent-line-to col)
|
|
(when (> offset 0)
|
|
(forward-char offset))))))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; Go mode
|
|
;;
|
|
|
|
;;;###autoload
|
|
(define-derived-mode go-mode nil "Go"
|
|
"Major mode for editing Go source text.
|
|
|
|
This provides basic syntax highlighting for keywords, built-ins,
|
|
functions, and some types. It also provides indentation that is
|
|
\(almost) identical to gofmt."
|
|
|
|
;; Font lock
|
|
(set (make-local-variable 'font-lock-defaults)
|
|
'(go-mode-font-lock-keywords nil nil nil nil))
|
|
|
|
;; Remove stale text properties
|
|
(save-restriction
|
|
(widen)
|
|
(remove-text-properties 1 (point-max)
|
|
'(go-mode-cs nil go-mode-nesting nil)))
|
|
|
|
;; 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)
|
|
|
|
;; Indentation
|
|
(set (make-local-variable 'indent-line-function)
|
|
#'go-mode-indent-line)
|
|
(add-hook 'after-change-functions #'go-mode-delayed-electric-hook nil t)
|
|
|
|
;; Comments
|
|
(set (make-local-variable 'comment-start) "// ")
|
|
(set (make-local-variable 'comment-end) "")
|
|
|
|
;; Go style
|
|
(setq indent-tabs-mode t))
|
|
|
|
;;;###autoload
|
|
(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 ()
|
|
"Pipe the current buffer through the external tool `gofmt`.
|
|
Replace the current buffer on success; display errors on failure."
|
|
|
|
(interactive)
|
|
(let ((currconf (current-window-configuration)))
|
|
(let ((srcbuf (current-buffer)))
|
|
(with-temp-buffer
|
|
(let ((outbuf (current-buffer))
|
|
(errbuf (get-buffer-create "*Gofmt Errors*"))
|
|
(coding-system-for-read 'utf-8) ;; use utf-8 with subprocesses
|
|
(coding-system-for-write 'utf-8))
|
|
(with-current-buffer errbuf (erase-buffer))
|
|
(with-current-buffer srcbuf
|
|
(save-restriction
|
|
(let (deactivate-mark)
|
|
(widen)
|
|
(if (= 0 (shell-command-on-region (point-min) (point-max) "gofmt"
|
|
outbuf nil errbuf))
|
|
;; restore window config
|
|
;; gofmt succeeded: replace the current buffer with outbuf,
|
|
;; restore the mark and point, and discard errbuf.
|
|
(let ((old-mark (mark t)) (old-point (point)))
|
|
(set-window-configuration currconf)
|
|
(erase-buffer)
|
|
(insert-buffer-substring outbuf)
|
|
(goto-char (min old-point (point-max)))
|
|
(if old-mark (push-mark (min old-mark (point-max)) t))
|
|
(kill-buffer errbuf))
|
|
|
|
;; gofmt failed: display the errors
|
|
(display-buffer errbuf)))))
|
|
|
|
;; Collapse any window opened on outbuf if shell-command-on-region
|
|
;; displayed it.
|
|
(delete-windows-on outbuf))))))
|
|
|
|
;;;###autoload
|
|
(defun gofmt-before-save ()
|
|
"Add this to .emacs to run gofmt on the current buffer when saving:
|
|
(add-hook 'before-save-hook #'gofmt-before-save)"
|
|
|
|
(interactive)
|
|
(when (eq major-mode 'go-mode) (gofmt)))
|
|
|
|
(defun godoc-read-query ()
|
|
"Read a godoc query from the minibuffer."
|
|
;; Compute the default query as the symbol under the cursor.
|
|
;; TODO: This does the wrong thing for e.g. multipart.NewReader (it only grabs
|
|
;; half) but I see no way to disambiguate that from e.g. foobar.SomeMethod.
|
|
(let* ((bounds (bounds-of-thing-at-point 'symbol))
|
|
(symbol (if bounds
|
|
(buffer-substring-no-properties (car bounds)
|
|
(cdr bounds)))))
|
|
(read-string (if symbol
|
|
(format "godoc (default %s): " symbol)
|
|
"godoc: ")
|
|
nil nil symbol)))
|
|
|
|
(defun godoc-get-buffer (query)
|
|
"Get an empty buffer for a godoc query."
|
|
(let* ((buffer-name (concat "*godoc " query "*"))
|
|
(buffer (get-buffer buffer-name)))
|
|
;; Kill the existing buffer if it already exists.
|
|
(when buffer (kill-buffer buffer))
|
|
(get-buffer-create buffer-name)))
|
|
|
|
(defun godoc-buffer-sentinel (proc event)
|
|
"Sentinel function run when godoc command completes."
|
|
(with-current-buffer (process-buffer proc)
|
|
(cond ((string= event "finished\n") ;; Successful exit.
|
|
(goto-char (point-min))
|
|
(display-buffer (current-buffer) 'not-this-window))
|
|
((not (= (process-exit-status proc) 0)) ;; Error exit.
|
|
(let ((output (buffer-string)))
|
|
(kill-buffer (current-buffer))
|
|
(message (concat "godoc: " output)))))))
|
|
|
|
;;;###autoload
|
|
(defun godoc (query)
|
|
"Show go documentation for a query, much like M-x man."
|
|
(interactive (list (godoc-read-query)))
|
|
(unless (string= query "")
|
|
(set-process-sentinel
|
|
(start-process-shell-command "godoc" (godoc-get-buffer query)
|
|
(concat "godoc " query))
|
|
'godoc-buffer-sentinel)
|
|
nil))
|
|
|
|
(provide 'go-mode)
|