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- ;; Copyright (c) 2011 The Chromium Authors. All rights reserved.
- ;; Use of this source code is governed by a BSD-style license that can be
- ;; found in the LICENSE file.
- ;; Set up flymake for use with chromium code. Uses ninja (since none of the
- ;; other chromium build systems have latency that allows interactive use).
- ;;
- ;; Requires a modern emacs (GNU Emacs >= 23) and that gyp has already generated
- ;; the build.ninja file(s). See defcustoms below for settable knobs.
- (require 'flymake)
- (defcustom cr-flymake-ninja-build-file "out/Debug/build.ninja"
- "Relative path from chromium's src/ directory to the
- build.ninja file to use.")
- (defcustom cr-flymake-ninja-executable "ninja"
- "Ninja executable location; either in $PATH or explicitly given.")
- (defun cr-flymake-absbufferpath ()
- "Return the absolute path to the current buffer, or nil if the
- current buffer has no path."
- (when buffer-file-truename
- (expand-file-name buffer-file-truename)))
- (defun cr-flymake-chromium-src ()
- "Return chromium's src/ directory, or nil on failure."
- (let ((srcdir (locate-dominating-file
- (cr-flymake-absbufferpath) cr-flymake-ninja-build-file)))
- (when srcdir (expand-file-name srcdir))))
- (defun cr-flymake-string-prefix-p (prefix str)
- "Return non-nil if PREFIX is a prefix of STR (23.2 has string-prefix-p but
- that's case insensitive and also 23.1 doesn't have it)."
- (string= prefix (substring str 0 (length prefix))))
- (defun cr-flymake-current-file-name ()
- "Return the relative path from chromium's src/ directory to the
- file backing the current buffer or nil if it doesn't look like
- we're under chromium/src/."
- (when (and (cr-flymake-chromium-src)
- (cr-flymake-string-prefix-p
- (cr-flymake-chromium-src) (cr-flymake-absbufferpath)))
- (substring (cr-flymake-absbufferpath) (length (cr-flymake-chromium-src)))))
- (defun cr-flymake-from-build-to-src-root ()
- "Return a path fragment for getting from the build.ninja file to src/."
- (replace-regexp-in-string
- "[^/]+" ".."
- (substring
- (file-name-directory
- (file-truename (or (and (cr-flymake-string-prefix-p
- "/" cr-flymake-ninja-build-file)
- cr-flymake-ninja-build-file)
- (concat (cr-flymake-chromium-src)
- cr-flymake-ninja-build-file))))
- (length (cr-flymake-chromium-src)))))
- (defun cr-flymake-getfname (file-name-from-error-message)
- "Strip cruft from the passed-in filename to help flymake find the real file."
- (file-name-nondirectory file-name-from-error-message))
- (defun cr-flymake-ninja-command-line ()
- "Return the command-line for running ninja, as a list of strings, or nil if
- we're not during a save"
- (unless (buffer-modified-p)
- (list cr-flymake-ninja-executable
- (list "-C"
- (concat (cr-flymake-chromium-src)
- (file-name-directory cr-flymake-ninja-build-file))
- (concat (cr-flymake-from-build-to-src-root)
- (cr-flymake-current-file-name) "^")))))
- (defun cr-flymake-kick-off-check-after-save ()
- "Kick off a syntax check after file save, if flymake-mode is on."
- (when flymake-mode (flymake-start-syntax-check)))
- (defadvice next-error (around cr-flymake-next-error activate)
- "If flymake has something to say, let it say it; otherwise
- revert to normal next-error behavior."
- (if (not flymake-err-info)
- (condition-case msg
- ad-do-it
- (error (message "%s" (prin1-to-string msg))))
- (flymake-goto-next-error)
- ;; copy/pasted from flymake-display-err-menu-for-current-line because I
- ;; couldn't find a way to have it tell me what the relevant error for this
- ;; line was in a single call:
- (let* ((line-no (flymake-current-line-no))
- (line-err-info-list
- (nth 0 (flymake-find-err-info flymake-err-info line-no)))
- (menu-data (flymake-make-err-menu-data line-no line-err-info-list)))
- (prin1 (car (car (car (cdr menu-data)))) t))))
- (defun cr-flymake-find-file ()
- "Enable flymake, but only if it makes sense, and immediately
- disable timer-based execution."
- (when (and (not flymake-mode)
- (not buffer-read-only)
- (cr-flymake-current-file-name))
- ;; Since flymake-allowed-file-name-masks requires static regexps to match
- ;; against, can't use cr-flymake-chromium-src here. Instead we add a
- ;; generic regexp, but only to a buffer-local version of the variable.
- (set (make-local-variable 'flymake-allowed-file-name-masks)
- (list (list "\\.c\\(\\|c\\|pp\\)"
- 'cr-flymake-ninja-command-line
- 'ignore
- 'cr-flymake-getfname)))
- (flymake-find-file-hook)
- (if flymake-mode
- (when flymake-timer (cancel-timer flymake-timer))
- (kill-local-variable 'flymake-allowed-file-name-masks))))
- (defun cr-compile ()
- "Run the interactive compile command with the working directory
- set to src/."
- (interactive)
- (let ((default-directory (cr-flymake-chromium-src)))
- (call-interactively 'compile)))
- (add-hook 'find-file-hook 'cr-flymake-find-file 'append)
- (add-hook 'after-save-hook 'cr-flymake-kick-off-check-after-save)
- ;; Show flymake infrastructure ERRORs in hopes of fixing them. Set to 3 for
- ;; DEBUG-level output from flymake.el.
- (setq flymake-log-level 0)
- (provide 'flymake-chromium)
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