mirror of
https://github.com/golang/go
synced 2024-11-25 15:57:57 -07:00
11cafa3a42
The previous code assumed the gofmt output referred to /tmp but that's not true if TMPDIR points somewhere else (like on Macs). Fixes #3782. R=sameer CC=golang-dev https://golang.org/cl/6346050
898 lines
32 KiB
EmacsLisp
898 lines
32 KiB
EmacsLisp
;;; go-mode.el --- Major mode for the Go programming language
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;;; Commentary:
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;; For installation instructions, see go-mode-load.el
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;;; To do:
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;; * Indentation is *almost* identical to gofmt
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;; ** We think struct literal keys are labels and outdent them
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;; ** We disagree on the indentation of function literals in arguments
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;; ** There are bugs with the close brace of struct literals
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;; * Highlight identifiers according to their syntactic context: type,
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;; variable, function call, or tag
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;; * Command for adding an import
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;; ** Check if it's already there
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;; ** Factor/unfactor the import line
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;; ** Alphabetize
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;; * Remove unused imports
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;; ** This is hard, since I have to be aware of shadowing to do it
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;; right
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;; * Format region using gofmt
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;;; Code:
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(eval-when-compile (require 'cl))
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(defvar go-mode-syntax-table
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(let ((st (make-syntax-table)))
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;; Add _ to :word: character class
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(modify-syntax-entry ?_ "w" st)
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;; Operators (punctuation)
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(modify-syntax-entry ?+ "." st)
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(modify-syntax-entry ?- "." st)
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(modify-syntax-entry ?* ". 23" st) ; also part of comments
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(modify-syntax-entry ?/ (if (featurep 'xemacs) ". 1456" ". 124b") st) ; ditto
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(modify-syntax-entry ?% "." st)
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(modify-syntax-entry ?& "." st)
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(modify-syntax-entry ?| "." st)
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(modify-syntax-entry ?^ "." st)
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(modify-syntax-entry ?! "." st)
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(modify-syntax-entry ?= "." st)
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(modify-syntax-entry ?< "." st)
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(modify-syntax-entry ?> "." st)
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;; Strings and comments are font-locked separately.
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(modify-syntax-entry ?\" "." st)
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(modify-syntax-entry ?\' "." st)
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(modify-syntax-entry ?` "." st)
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(modify-syntax-entry ?\\ "." st)
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;; Newline is a comment-ender.
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(modify-syntax-entry ?\n "> b" st)
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st)
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"Syntax table for Go mode.")
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(defvar go-mode-keywords
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'("break" "default" "func" "interface" "select"
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"case" "defer" "go" "map" "struct"
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"chan" "else" "goto" "package" "switch"
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"const" "fallthrough" "if" "range" "type"
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"continue" "for" "import" "return" "var")
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"All keywords in the Go language. Used for font locking and
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some syntax analysis.")
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(defvar go-mode-font-lock-keywords
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(let ((builtins '("append" "cap" "close" "complex" "copy" "delete" "imag" "len"
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"make" "new" "panic" "print" "println" "real" "recover"))
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(constants '("nil" "true" "false" "iota"))
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(type-name "\\s *\\(?:[*(]\\s *\\)*\\(?:\\w+\\s *\\.\\s *\\)?\\(\\w+\\)")
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)
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`((go-mode-font-lock-cs-comment 0 font-lock-comment-face t)
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(go-mode-font-lock-cs-string 0 font-lock-string-face t)
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(,(regexp-opt go-mode-keywords 'words) . font-lock-keyword-face)
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(,(regexp-opt builtins 'words) . font-lock-builtin-face)
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(,(regexp-opt constants 'words) . font-lock-constant-face)
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;; Function names in declarations
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("\\<func\\>\\s *\\(\\w+\\)" 1 font-lock-function-name-face)
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;; Function names in methods are handled by function call pattern
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;; Function names in calls
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;; XXX Doesn't match if function name is surrounded by parens
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("\\(\\w+\\)\\s *(" 1 font-lock-function-name-face)
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;; Type names
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("\\<type\\>\\s *\\(\\w+\\)" 1 font-lock-type-face)
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(,(concat "\\<type\\>\\s *\\w+\\s *" type-name) 1 font-lock-type-face)
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;; Arrays/slices/map value type
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;; XXX Wrong. Marks 0 in expression "foo[0] * x"
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;; (,(concat "]" type-name) 1 font-lock-type-face)
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;; Map key type
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(,(concat "\\<map\\s *\\[" type-name) 1 font-lock-type-face)
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;; Channel value type
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(,(concat "\\<chan\\>\\s *\\(?:<-\\)?" type-name) 1 font-lock-type-face)
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;; new/make type
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(,(concat "\\<\\(?:new\\|make\\)\\>\\(?:\\s \\|)\\)*(" type-name) 1 font-lock-type-face)
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;; Type conversion
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(,(concat "\\.\\s *(" type-name) 1 font-lock-type-face)
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;; Method receiver type
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(,(concat "\\<func\\>\\s *(\\w+\\s +" type-name) 1 font-lock-type-face)
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;; Labels
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;; XXX Not quite right. Also marks compound literal fields.
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("^\\s *\\(\\w+\\)\\s *:\\(\\S.\\|$\\)" 1 font-lock-constant-face)
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("\\<\\(goto\\|break\\|continue\\)\\>\\s *\\(\\w+\\)" 2 font-lock-constant-face)))
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"Basic font lock keywords for Go mode. Highlights keywords,
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built-ins, functions, and some types.")
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Key map
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;;
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(defvar go-mode-map
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(let ((m (make-sparse-keymap)))
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(define-key m "}" #'go-mode-insert-and-indent)
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(define-key m ")" #'go-mode-insert-and-indent)
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(define-key m "," #'go-mode-insert-and-indent)
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(define-key m ":" #'go-mode-delayed-electric)
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;; In case we get : indentation wrong, correct ourselves
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(define-key m "=" #'go-mode-insert-and-indent)
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m)
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"Keymap used by Go mode to implement electric keys.")
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(defun go-mode-insert-and-indent (key)
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"Invoke the global binding of KEY, then reindent the line."
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(interactive (list (this-command-keys)))
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(call-interactively (lookup-key (current-global-map) key))
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(indent-according-to-mode))
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(defvar go-mode-delayed-point nil
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"The point following the previous insertion if the insertion
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was a delayed electric key. Used to communicate between
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`go-mode-delayed-electric' and `go-mode-delayed-electric-hook'.")
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(make-variable-buffer-local 'go-mode-delayed-point)
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(defun go-mode-delayed-electric (p)
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"Perform electric insertion, but delayed by one event.
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This inserts P into the buffer, as usual, then waits for another key.
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If that second key causes a buffer modification starting at the
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point after the insertion of P, reindents the line containing P."
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(interactive "p")
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(self-insert-command p)
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(setq go-mode-delayed-point (point)))
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(defun go-mode-delayed-electric-hook (b e l)
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"An after-change-function that implements `go-mode-delayed-electric'."
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(when (and go-mode-delayed-point
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(= go-mode-delayed-point b))
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(save-excursion
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(save-match-data
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(goto-char go-mode-delayed-point)
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(indent-according-to-mode))))
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(setq go-mode-delayed-point nil))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Parser
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;;
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(defvar go-mode-mark-cs-end 1
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"The point at which the comment/string cache ends. The buffer
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will be marked from the beginning up to this point (that is, up
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to and including character (1- go-mode-mark-cs-end)).")
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(make-variable-buffer-local 'go-mode-mark-cs-end)
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(defvar go-mode-mark-string-end 1
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"The point at which the string cache ends. The buffer
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will be marked from the beginning up to this point (that is, up
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to and including character (1- go-mode-mark-string-end)).")
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(make-variable-buffer-local 'go-mode-mark-string-end)
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(defvar go-mode-mark-comment-end 1
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"The point at which the comment cache ends. The buffer
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will be marked from the beginning up to this point (that is, up
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to and including character (1- go-mode-mark-comment-end)).")
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(make-variable-buffer-local 'go-mode-mark-comment-end)
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(defvar go-mode-mark-nesting-end 1
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"The point at which the nesting cache ends. The buffer will be
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marked from the beginning up to this point.")
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(make-variable-buffer-local 'go-mode-mark-nesting-end)
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(defun go-mode-mark-clear-cs (b e l)
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"An after-change-function that removes the go-mode-cs text property"
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(remove-text-properties b e '(go-mode-cs)))
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(defun go-mode-mark-clear-cache (b e)
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"A before-change-function that clears the comment/string and
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nesting caches from the modified point on."
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(save-restriction
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(widen)
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(when (<= b go-mode-mark-cs-end)
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;; Remove the property adjacent to the change position.
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;; It may contain positions pointing beyond the new end mark.
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(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-cs)))
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(if cs (car cs) b))))
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(remove-text-properties
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b (min go-mode-mark-cs-end (point-max)) '(go-mode-cs nil))
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(setq go-mode-mark-cs-end b)))
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(when (<= b go-mode-mark-string-end)
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;; Remove the property adjacent to the change position.
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;; It may contain positions pointing beyond the new end mark.
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(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-string)))
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(if cs (car cs) b))))
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(remove-text-properties
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b (min go-mode-mark-string-end (point-max)) '(go-mode-string nil))
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(setq go-mode-mark-string-end b)))
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(when (<= b go-mode-mark-comment-end)
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;; Remove the property adjacent to the change position.
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;; It may contain positions pointing beyond the new end mark.
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(let ((b (let ((cs (get-text-property (max 1 (1- b)) 'go-mode-comment)))
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(if cs (car cs) b))))
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(remove-text-properties
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b (min go-mode-mark-string-end (point-max)) '(go-mode-comment nil))
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(setq go-mode-mark-comment-end b)))
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(when (< b go-mode-mark-nesting-end)
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(remove-text-properties b (min go-mode-mark-nesting-end (point-max)) '(go-mode-nesting nil))
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(setq go-mode-mark-nesting-end b))))
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(defmacro go-mode-parser (&rest body)
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"Evaluate BODY in an environment set up for parsers that use
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text properties to mark text. This inhibits changes to the undo
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list or the buffer's modification status and inhibits calls to
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the modification hooks. It also saves the excursion and
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restriction and widens the buffer, since most parsers are
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context-sensitive."
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(let ((modified-var (make-symbol "modified")))
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`(let ((buffer-undo-list t)
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(,modified-var (buffer-modified-p))
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(inhibit-modification-hooks t)
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(inhibit-read-only t))
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(save-excursion
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(save-restriction
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(widen)
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(unwind-protect
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(progn ,@body)
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(set-buffer-modified-p ,modified-var)))))))
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(defun go-mode-cs (&optional pos)
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"Return the comment/string state at point POS. If point is
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inside a comment or string (including the delimiters), this
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returns a pair (START . END) indicating the extents of the
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comment or string."
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(unless pos
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(setq pos (point)))
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(when (>= pos go-mode-mark-cs-end)
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(go-mode-mark-cs (1+ pos)))
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(get-text-property pos 'go-mode-cs))
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(defun go-mode-mark-cs (end)
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"Mark comments and strings up to point END. Don't call this
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directly; use `go-mode-cs'."
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(setq end (min end (point-max)))
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(go-mode-parser
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(save-match-data
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(let ((pos
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;; Back up to the last known state.
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(let ((last-cs
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(and (> go-mode-mark-cs-end 1)
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(get-text-property (1- go-mode-mark-cs-end)
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'go-mode-cs))))
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(if last-cs
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(car last-cs)
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(max 1 (1- go-mode-mark-cs-end))))))
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(while (< pos end)
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(goto-char pos)
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(let ((cs-end ; end of the text property
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(cond
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((looking-at "//")
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(end-of-line)
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(1+ (point)))
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((looking-at "/\\*")
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(goto-char (+ pos 2))
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(if (search-forward "*/" (1+ end) t)
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(point)
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end))
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((looking-at "\"")
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(goto-char (1+ pos))
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(if (looking-at "[^\"\n\\\\]*\\(\\\\.[^\"\n\\\\]*\\)*\"")
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(match-end 0)
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(end-of-line)
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(point)))
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((looking-at "'")
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(goto-char (1+ pos))
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(if (looking-at "[^'\n\\\\]*\\(\\\\.[^'\n\\\\]*\\)*'")
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(match-end 0)
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(end-of-line)
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(point)))
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((looking-at "`")
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(goto-char (1+ pos))
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(while (if (search-forward "`" end t)
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(if (eq (char-after) ?`)
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(goto-char (1+ (point))))
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(goto-char end)
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nil))
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(point)))))
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(cond
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(cs-end
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(put-text-property pos cs-end 'go-mode-cs (cons pos cs-end))
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(setq pos cs-end))
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((re-search-forward "[\"'`]\\|/[/*]" end t)
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(setq pos (match-beginning 0)))
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(t
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(setq pos end)))))
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(setq go-mode-mark-cs-end pos)))))
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(defun go-mode-in-comment (&optional pos)
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"Return the comment/string state at point POS. If point is
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inside a comment (including the delimiters), this
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returns a pair (START . END) indicating the extents of the
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comment or string."
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(unless pos
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(setq pos (point)))
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(when (> pos go-mode-mark-comment-end)
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(go-mode-mark-comment pos))
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(get-text-property pos 'go-mode-comment))
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(defun go-mode-mark-comment (end)
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"Mark comments up to point END. Don't call this directly; use `go-mode-in-comment'."
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(setq end (min end (point-max)))
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(go-mode-parser
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(save-match-data
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(let ((pos
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;; Back up to the last known state.
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(let ((last-comment
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(and (> go-mode-mark-comment-end 1)
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(get-text-property (1- go-mode-mark-comment-end)
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'go-mode-comment))))
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(if last-comment
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(car last-comment)
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(max 1 (1- go-mode-mark-comment-end))))))
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(while (< pos end)
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(goto-char pos)
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(let ((comment-end ; end of the text property
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(cond
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((looking-at "//")
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(end-of-line)
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(1+ (point)))
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((looking-at "/\\*")
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(goto-char (+ pos 2))
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(if (search-forward "*/" (1+ end) t)
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(point)
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end)))))
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(cond
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(comment-end
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(put-text-property pos comment-end 'go-mode-comment (cons pos comment-end))
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(setq pos comment-end))
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((re-search-forward "/[/*]" end t)
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(setq pos (match-beginning 0)))
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(t
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(setq pos end)))))
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(setq go-mode-mark-comment-end pos)))))
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(defun go-mode-in-string (&optional pos)
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"Return the string state at point POS. If point is
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inside a string (including the delimiters), this
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returns a pair (START . END) indicating the extents of the
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comment or string."
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(unless pos
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(setq pos (point)))
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(when (> pos go-mode-mark-string-end)
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(go-mode-mark-string pos))
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(get-text-property pos 'go-mode-string))
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(defun go-mode-mark-string (end)
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"Mark strings up to point END. Don't call this
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directly; use `go-mode-in-string'."
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(setq end (min end (point-max)))
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(go-mode-parser
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(save-match-data
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(let ((pos
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;; Back up to the last known state.
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(let ((last-cs
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(and (> go-mode-mark-string-end 1)
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(get-text-property (1- go-mode-mark-string-end)
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'go-mode-string))))
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(if last-cs
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(car last-cs)
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(max 1 (1- go-mode-mark-string-end))))))
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(while (< pos end)
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(goto-char pos)
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(let ((cs-end ; end of the text property
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(cond
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((looking-at "\"")
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(goto-char (1+ pos))
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(if (looking-at "[^\"\n\\\\]*\\(\\\\.[^\"\n\\\\]*\\)*\"")
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(match-end 0)
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(end-of-line)
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(point)))
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((looking-at "'")
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(goto-char (1+ pos))
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(if (looking-at "[^'\n\\\\]*\\(\\\\.[^'\n\\\\]*\\)*'")
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(match-end 0)
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(end-of-line)
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(point)))
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((looking-at "`")
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(goto-char (1+ pos))
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(while (if (search-forward "`" end t)
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(if (eq (char-after) ?`)
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(goto-char (1+ (point))))
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(goto-char end)
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nil))
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(point)))))
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(cond
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(cs-end
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(put-text-property pos cs-end 'go-mode-string (cons pos cs-end))
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(setq pos cs-end))
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((re-search-forward "[\"'`]" end t)
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(setq pos (match-beginning 0)))
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(t
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(setq pos end)))))
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(setq go-mode-mark-string-end pos)))))
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(defun go-mode-font-lock-cs (limit comment)
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"Helper function for highlighting comment/strings. If COMMENT is t,
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set match data to the next comment after point, and advance point
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after it. If COMMENT is nil, use the next string. Returns nil
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if no further tokens of the type exist."
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;; Ensures that `next-single-property-change' below will work properly.
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(go-mode-cs limit)
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(let (cs next (result 'scan))
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(while (eq result 'scan)
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(if (or (>= (point) limit) (eobp))
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(setq result nil)
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(setq cs (go-mode-cs))
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(if cs
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(if (eq (= (char-after (car cs)) ?/) comment)
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;; If inside the expected comment/string, highlight it.
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(progn
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;; If the match includes a "\n", we have a
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;; multi-line construct. Mark it as such.
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(goto-char (car cs))
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(when (search-forward "\n" (cdr cs) t)
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(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 newline, or char whitespace in the syntax table for go."
|
|
(or (eq char ?\n)
|
|
(= (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
|
|
(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 "`")))
|
|
;; 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))
|
|
(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 ()
|
|
"Indent the current line according to `go-mode-indentation'."
|
|
(interactive)
|
|
|
|
;; turn off case folding to distinguish keywords from identifiers
|
|
;; e.g. "default" is a keyword; "Default" can be a variable name.
|
|
(let ((case-fold-search nil))
|
|
(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)
|
|
(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
|
|
(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)
|
|
|
|
;; Handle unit test failure output in compilation-mode
|
|
;;
|
|
;; Note the final t argument to add-to-list for append, ie put these at the
|
|
;; *ends* of compilation-error-regexp-alist[-alist]. We want go-test to be
|
|
;; handled first, otherwise other elements will match that don't work, and
|
|
;; those alists are traversed in *reverse* order:
|
|
;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2001-12/msg00674.html
|
|
(when (and (boundp 'compilation-error-regexp-alist)
|
|
(boundp 'compilation-error-regexp-alist-alist))
|
|
(add-to-list 'compilation-error-regexp-alist 'go-test t)
|
|
(add-to-list 'compilation-error-regexp-alist-alist
|
|
'(go-test . ("^\t+\\([^()\t\n]+\\):\\([0-9]+\\):? .*$" 1 2)) t)))
|
|
|
|
;;;###autoload
|
|
(add-to-list 'auto-mode-alist (cons "\\.go$" #'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))
|
|
(filename buffer-file-name)
|
|
(patchbuf (get-buffer-create "*Gofmt patch*")))
|
|
(with-current-buffer patchbuf
|
|
(let ((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
|
|
(toggle-read-only 0)
|
|
(erase-buffer))
|
|
(with-current-buffer srcbuf
|
|
(save-restriction
|
|
(let (deactivate-mark)
|
|
(widen)
|
|
; If this is a new file, diff-mode can't apply a
|
|
; patch to a non-exisiting file, so replace the buffer
|
|
; completely with the output of 'gofmt'.
|
|
; If the file exists, patch it to keep the 'undo' list happy.
|
|
(let* ((newfile (not (file-exists-p filename)))
|
|
(flag (if newfile "" " -d")))
|
|
(if (= 0 (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))
|
|
(old-mark (mark t)))
|
|
(kill-buffer errbuf)
|
|
(if newfile
|
|
; New file, replace it (diff-mode won't work)
|
|
(gofmt-replace-buffer srcbuf patchbuf)
|
|
; Existing file, patch it
|
|
(gofmt-apply-patch filename srcbuf patchbuf))
|
|
(goto-char (min old-point (point-max)))
|
|
;; Restore the mark and point
|
|
(if old-mark (push-mark (min old-mark (point-max)) t))
|
|
(set-window-configuration currconf))
|
|
|
|
;; gofmt failed: display the errors
|
|
(gofmt-process-errors filename errbuf))))))
|
|
|
|
;; Collapse any window opened on outbuf if shell-command-on-region
|
|
;; displayed it.
|
|
(delete-windows-on patchbuf)))
|
|
(kill-buffer patchbuf))))
|
|
|
|
(defun gofmt-replace-buffer (srcbuf patchbuf)
|
|
(with-current-buffer srcbuf
|
|
(erase-buffer)
|
|
(insert-buffer-substring patchbuf)))
|
|
|
|
(defconst gofmt-stdin-tag "<standard input>")
|
|
|
|
(defun gofmt-apply-patch (filename srcbuf patchbuf)
|
|
(require 'diff-mode)
|
|
;; apply all the patch hunks
|
|
(with-current-buffer patchbuf
|
|
(goto-char (point-min))
|
|
;; The .* is for TMPDIR, but to avoid dealing with TMPDIR
|
|
;; having a trailing / or not, it's easier to just search for .*
|
|
;; especially as we're only replacing the first instance.
|
|
(if (re-search-forward "^--- \\(.*/gofmt[0-9]*\\)" nil t)
|
|
(replace-match filename nil nil nil 1))
|
|
(condition-case nil
|
|
(while t
|
|
(diff-hunk-next)
|
|
(diff-apply-hunk))
|
|
;; When there's no more hunks, diff-hunk-next signals an error, ignore it
|
|
(error nil))))
|
|
|
|
(defun gofmt-process-errors (filename errbuf)
|
|
;; Convert the gofmt stderr to something understood by the compilation mode.
|
|
(with-current-buffer errbuf
|
|
(goto-char (point-min))
|
|
(insert "gofmt errors:\n")
|
|
(if (search-forward gofmt-stdin-tag nil t)
|
|
(replace-match (file-name-nondirectory filename) nil t))
|
|
(display-buffer errbuf)
|
|
(compilation-mode)))
|
|
|
|
;;;###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)
|