+;; Run compiler as inferior of Emacs, and parse its error messages.
+;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY. No author or distributor
+;; accepts responsibility to anyone for the consequences of using it
+;; or for whether it serves any particular purpose or works at all,
+;; unless he says so in writing. Refer to the GNU Emacs General Public
+;; License for full details.
+
+;; Everyone is granted permission to copy, modify and redistribute
+;; GNU Emacs, but only under the conditions described in the
+;; GNU Emacs General Public License. A copy of this license is
+;; supposed to have been given to you along with GNU Emacs so you
+;; can know your rights and responsibilities. It should be in a
+;; file named COPYING. Among other things, the copyright notice
+;; and this notice must be preserved on all copies.
+
+(provide 'compile)
+
+(defvar compilation-process nil
+ "Process created by compile command, or nil if none exists now.
+Note that the process may have been \"deleted\" and still
+be the value of this variable.")
+
+(defvar compilation-error-list nil
+ "List of error message descriptors for visiting erring functions.
+Each error descriptor is a list of length two.
+Its car is a marker pointing to an error message.
+Its cadr is a marker pointing to the text of the line the message is about,
+ or nil if that is not interesting.
+The value may be t instead of a list;
+this means that the buffer of error messages should be reparsed
+the next time the list of errors is wanted.")
+
+(defvar compilation-parsing-end nil
+ "Position of end of buffer when last error messages parsed.")
+
+(defvar compilation-error-message nil
+ "Message to print when no more matches for compilation-error-regexp are found")
+
+;; The filename excludes colons to avoid confusion when error message
+;; starts with digits.
+(defvar compilation-error-regexp
+ "\\([^ :\n]+\\(: *\\|, line \\|(\\)[0-9]+\\)\\|\\([0-9]+ *of *[^ \n]+\\)"
+ "Regular expression for filename/linenumber in error in compilation log.")
+
+(defun compile (command)
+ "Compile the program including the current buffer. Default: run `make'.
+Runs COMMAND, a shell command, in a separate process asynchronously
+with output going to the buffer *compilation*.
+You can then use the command \\[next-error] to find the next error message
+and move to the source code that caused it."
+ (interactive (list (read-string "Compile command: " compile-command)))
+ (setq compile-command command)
+ (compile1 compile-command "No more errors"))
+
+(defun grep (command)
+ "Run grep, with user-specified args, and collect output in a buffer.
+While grep runs asynchronously, you can use the \\[next-error] command
+to find the text that grep hits refer to."
+ (interactive "sRun grep (with args): ")
+ (compile1 (concat "grep -n " command " /dev/null")
+ "No more grep hits" "grep"))
+
+(defun compile1 (command error-message &optional name-of-mode)
+ (save-some-buffers)
+ (if compilation-process
+ (if (or (not (eq (process-status compilation-process) 'run))
+ (yes-or-no-p "A compilation process is running; kill it? "))
+ (condition-case ()
+ (let ((comp-proc compilation-process))
+ (interrupt-process comp-proc)
+ (sit-for 1)
+ (delete-process comp-proc))
+ (error nil))
+ (error "Cannot have two compilation processes")))
+ (setq compilation-process nil)
+ (compilation-forget-errors)
+ (setq compilation-error-list t)
+ (setq compilation-error-message error-message)
+ (setq compilation-process
+ (start-process "compilation" "*compilation*"
+ shell-file-name
+ "-c" (concat "exec " command)))
+ (with-output-to-temp-buffer "*compilation*"
+ (princ "cd ")
+ (princ default-directory)
+ (terpri)
+ (princ command)
+ (terpri))
+ (let ((regexp compilation-error-regexp))
+ (save-excursion
+ (set-buffer "*compilation*")
+ (make-local-variable 'compilation-error-regexp)
+ (setq compilation-error-regexp regexp)))
+ (set-process-sentinel compilation-process 'compilation-sentinel)
+ (let* ((thisdir default-directory)
+ (outbuf (process-buffer compilation-process))
+ (outwin (get-buffer-window outbuf)))
+ (if (eq outbuf (current-buffer))
+ (goto-char (point-max)))
+ (save-excursion
+ (set-buffer outbuf)
+ (buffer-flush-undo outbuf)
+ (let ((start (save-excursion (set-buffer outbuf) (point-min))))
+ (set-window-start outwin start)
+ (or (eq outwin (selected-window))
+ (set-window-point outwin start)))
+ (setq default-directory thisdir)
+ (fundamental-mode)
+ (setq mode-name (or name-of-mode "Compilation"))
+ ;; Make log buffer's mode line show process state
+ (setq mode-line-process '(": %s")))))
+
+;; Called when compilation process changes state.
+
+(defun compilation-sentinel (proc msg)
+ (cond ((null (buffer-name (process-buffer proc)))
+ ;; buffer killed
+ (set-process-buffer proc nil))
+ ((memq (process-status proc) '(signal exit))
+ (let* ((obuf (current-buffer))
+ omax opoint)
+ ;; save-excursion isn't the right thing if
+ ;; process-buffer is current-buffer
+ (unwind-protect
+ (progn
+ ;; Write something in *compilation* and hack its mode line,
+ (set-buffer (process-buffer proc))
+ (setq omax (point-max) opoint (point))
+ (goto-char (point-max))
+ (insert ?\n mode-name " " msg)
+ (forward-char -1)
+ (insert " at "
+ (substring (current-time-string) 0 -5))
+ (forward-char 1)
+ (setq mode-line-process
+ (concat ": "
+ (symbol-name (process-status proc))))
+ ;; If buffer and mode line will show that the process
+ ;; is dead, we can delete it now. Otherwise it
+ ;; will stay around until M-x list-processes.
+ (delete-process proc))
+ (setq compilation-process nil)
+ ;; Force mode line redisplay soon
+ (set-buffer-modified-p (buffer-modified-p)))
+ (if (and opoint (< opoint omax))
+ (goto-char opoint))
+ (set-buffer obuf)))))
+
+(defun kill-compilation ()
+ "Kill the process made by the \\[compile] command."
+ (interactive)
+ (if compilation-process
+ (interrupt-process compilation-process)))
+
+(defun kill-grep ()
+ "Kill the process made by the \\[grep] command."
+ (interactive)
+ (if compilation-process
+ (interrupt-process compilation-process)))
+
+(defun next-error (&optional argp)
+ "Visit next compilation error message and corresponding source code.
+This operates on the output from the \\[compile] command.
+If all preparsed error messages have been processed,
+the error message buffer is checked for new ones.
+A non-nil argument (prefix arg, if interactive)
+means reparse the error message buffer and start at the first error."
+ (interactive "P")
+ (if (or (eq compilation-error-list t)
+ argp)
+ (progn (compilation-forget-errors)
+ (setq compilation-parsing-end 1)))
+ (if compilation-error-list
+ nil
+ (save-excursion
+ (switch-to-buffer "*compilation*")
+ (set-buffer-modified-p nil)
+ (compilation-parse-errors)))
+ (let ((next-error (car compilation-error-list)))
+ (if (null next-error)
+ (error (concat compilation-error-message
+ (if (and compilation-process
+ (eq (process-status compilation-process)
+ 'run))
+ " yet" ""))))
+ (setq compilation-error-list (cdr compilation-error-list))
+ (if (null (car (cdr next-error)))
+ nil
+ (switch-to-buffer (marker-buffer (car (cdr next-error))))
+ (goto-char (car (cdr next-error)))
+ (set-marker (car (cdr next-error)) nil))
+ (let* ((pop-up-windows t)
+ (w (display-buffer (marker-buffer (car next-error)))))
+ (set-window-point w (car next-error))
+ (set-window-start w (car next-error)))
+ (set-marker (car next-error) nil)))
+
+;; Set compilation-error-list to nil, and
+;; unchain the markers that point to the error messages and their text,
+;; so that they no longer slow down gap motion.
+;; This would happen anyway at the next garbage collection,
+;; but it is better to do it right away.
+(defun compilation-forget-errors ()
+ (if (eq compilation-error-list t)
+ (setq compilation-error-list nil))
+ (while compilation-error-list
+ (let ((next-error (car compilation-error-list)))
+ (set-marker (car next-error) nil)
+ (if (car (cdr next-error))
+ (set-marker (car (cdr next-error)) nil)))
+ (setq compilation-error-list (cdr compilation-error-list))))
+
+(defun compilation-parse-errors ()
+ "Parse the current buffer as error messages.
+This makes a list of error descriptors, compilation-error-list.
+For each source-file, line-number pair in the buffer,
+the source file is read in, and the text location is saved in compilation-error-list.
+The function next-error, assigned to \\[next-error], takes the next error off the list
+and visits its location."
+ (setq compilation-error-list nil)
+ (message "Parsing error messages...")
+ (let (text-buffer
+ last-filename last-linenum)
+ ;; Don't reparse messages already seen at last parse.
+ (goto-char compilation-parsing-end)
+ ;; Don't parse the first two lines as error messages.
+ ;; This matters for grep.
+ (if (bobp)
+ (forward-line 2))
+ (while (re-search-forward compilation-error-regexp nil t)
+ (let (linenum filename
+ error-marker text-marker)
+ ;; Extract file name and line number from error message.
+ (save-restriction
+ (narrow-to-region (match-beginning 0) (match-end 0))
+ (goto-char (point-max))
+ (skip-chars-backward "[0-9]")
+ ;; If it's a lint message, use the last file(linenum) on the line.
+ ;; Normally we use the first on the line.
+ (if (= (preceding-char) ?\()
+ (progn
+ (narrow-to-region (point-min) (1+ (buffer-size)))
+ (end-of-line)
+ (re-search-backward compilation-error-regexp)
+ (skip-chars-backward "^ \t\n")
+ (narrow-to-region (point) (match-end 0))
+ (goto-char (point-max))
+ (skip-chars-backward "[0-9]")))
+ ;; Are we looking at a "filename-first" or "line-number-first" form?
+ (if (looking-at "[0-9]")
+ (progn
+ (setq linenum (read (current-buffer)))
+ (goto-char (point-min)))
+ ;; Line number at start, file name at end.
+ (progn
+ (goto-char (point-min))
+ (setq linenum (read (current-buffer)))
+ (goto-char (point-max))
+ (skip-chars-backward "^ \t\n")))
+ (setq filename (compilation-grab-filename)))
+ ;; Locate the erring file and line.
+ (if (and (equal filename last-filename)
+ (= linenum last-linenum))
+ nil
+ (beginning-of-line 1)
+ (setq error-marker (point-marker))
+ ;; text-buffer gets the buffer containing this error's file.
+ (if (not (equal filename last-filename))
+ (setq text-buffer
+ (and (file-exists-p (setq last-filename filename))
+ (find-file-noselect filename))
+ last-linenum 0))
+ (if text-buffer
+ ;; Go to that buffer and find the erring line.
+ (save-excursion
+ (set-buffer text-buffer)
+ (if (zerop last-linenum)
+ (progn
+ (goto-char 1)
+ (setq last-linenum 1)))
+ (forward-line (- linenum last-linenum))
+ (setq last-linenum linenum)
+ (setq text-marker (point-marker))
+ (setq compilation-error-list
+ (cons (list error-marker text-marker)
+ compilation-error-list)))))
+ (forward-line 1)))
+ (setq compilation-parsing-end (point-max)))
+ (message "Parsing error messages...done")
+ (setq compilation-error-list (nreverse compilation-error-list)))
+
+(defun compilation-grab-filename ()
+ "Return a string which is a filename, starting at point.
+Ignore quotes and parentheses around it, as well as trailing colons."
+ (if (eq (following-char) ?\")
+ (save-restriction
+ (narrow-to-region (point)
+ (progn (forward-sexp 1) (point)))
+ (goto-char (point-min))
+ (read (current-buffer)))
+ (buffer-substring (point)
+ (progn
+ (skip-chars-forward "^ :,\n\t(")
+ (point)))))
+
+(define-key ctl-x-map "`" 'next-error)
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