X-Git-Url: https://git.distorted.org.uk/~mdw/profile/blobdiff_plain/a62d05415841b7ba66ba9a660f68b452c4f1d1b6..a63efb6728ba8d0fd07a24235755c1345a9b897c:/el/dot-emacs.el

diff --git a/el/dot-emacs.el b/el/dot-emacs.el
index d83057a..e290e5a 100644
--- a/el/dot-emacs.el
+++ b/el/dot-emacs.el
@@ -293,6 +293,56 @@ it's currently off."
 	 (or transient-mark-mode (setq transient-mark-mode 'only))
 	 (set-mark (mark t)))))
 
+;; Improved compilation machinery.
+
+(setq compile-command
+      (let ((ncpu (with-temp-buffer
+		    (insert-file-contents "/proc/cpuinfo")
+		    (buffer-string)
+		    (count-matches "^processor\\s-*:"))))
+	(format "make -j%d -k" (* 2 ncpu))))
+
+(defun mdw-compilation-buffer-name (mode)
+  (concat "*" (downcase mode) ": "
+	  (abbreviate-file-name default-directory) "*"))
+(setq compilation-buffer-name-function 'mdw-compilation-buffer-name)
+
+(eval-after-load "compile"
+  '(progn
+     (define-key compilation-shell-minor-mode-map "\C-c\M-g" 'recompile)))
+
+(defun mdw-compile (command &optional directory comint)
+  "Initiate a compilation COMMAND, maybe in a different DIRECTORY.
+The DIRECTORY may be nil to not change.  If COMINT is t, then
+start an interactive compilation.
+
+Interactively, prompt for the command if the variable
+`compilation-read-command' is non-nil, or if requested through
+the prefix argument.  Prompt for the directory, and run
+interactively, if requested through the prefix.
+
+Use a prefix of 4, 6, 12, or 14, or type C-u between one and three times, to
+force prompting for a directory.
+
+Use a prefix of 2, 6, 10, or 14, or type C-u three times, to force
+prompting for the command.
+
+Use a prefix of 8, 10, 12, or 14, or type C-u twice or three times,
+to force interactive compilation."
+  (interactive
+   (let* ((prefix (prefix-numeric-value current-prefix-arg))
+	  (command (eval compile-command))
+	  (dir (and (plusp (logand prefix #x54))
+		    (read-directory-name "Compile in directory: "))))
+     (list (if (or compilation-read-command
+		   (plusp (logand prefix #x42)))
+	       (compilation-read-command command)
+	     command)
+	   dir
+	   (plusp (logand prefix #x58)))))
+  (let ((default-directory (or directory default-directory)))
+    (compile command comint)))
+
 ;; Functions for sexp diary entries.
 
 (defun mdw-not-org-mode (form)
@@ -721,7 +771,8 @@ sequences separated by `.'."
 	(cond ((null la) (throw 'done lb))
 	      ((null lb) (throw 'done nil))
 	      ((< (car la) (car lb)) (throw 'done t))
-	      ((= (car la) (car lb)) (setq la (cdr la) lb (cdr lb))))))))
+	      ((= (car la) (car lb)) (setq la (cdr la) lb (cdr lb)))
+	      (t (throw 'done nil)))))))
 
 (defun mdw-check-autorevert ()
   "Sets global-auto-revert-ignore-buffer appropriately for this buffer.
@@ -767,6 +818,17 @@ options."
       (ad-set-arg 0 dir)
       ad-do-it)))
 
+(defun mdw-dired-run (args &optional syncp)
+  (interactive (let ((file (dired-get-filename t)))
+		 (list (read-string (format "Arguments for %s: " file))
+		       current-prefix-arg)))
+  (funcall (if syncp 'shell-command 'async-shell-command)
+	   (concat (shell-quote-argument (dired-get-filename nil))
+		   " " args)))
+
+(eval-after-load "dired"
+  '(define-key dired-mode-map "X" 'mdw-dired-run))
+
 ;;;--------------------------------------------------------------------------
 ;;; URL viewing.
 
@@ -1238,6 +1300,9 @@ doesn't match any of the regular expressions in
 (mdw-define-face comint-highlight-input
   (t nil))
 
+(mdw-define-face ido-subdir
+  (t :foreground "cyan" :weight bold))
+
 (mdw-define-face dired-directory
   (t :foreground "cyan" :weight bold))
 (mdw-define-face dired-symlink
@@ -1420,34 +1485,32 @@ doesn't match any of the regular expressions in
 (mdw-define-face ediff-odd-diff-Ancestor
   (((class color) (type x)) :background "#320"))
 
+(mdw-define-face magit-hash
+  (((class color) (type x)) :foreground "grey40")
+  (((class color) (type tty)) :foreground "blue"))
+(mdw-define-face magit-diff-hunk-heading
+  (((class color) (type x)) :foreground "grey70" :background "grey25")
+  (((class color) (type tty)) :foreground "yellow"))
+(mdw-define-face magit-diff-hunk-heading-highlight
+  (((class color) (type x)) :foreground "grey70" :background "grey35")
+  (((class color) (type tty)) :foreground "yellow" :background "blue"))
+(mdw-define-face magit-diff-added
+  (((class color) (type x)) :foreground "#ddffdd" :background "#335533")
+  (((class color) (type tty)) :foreground "green"))
+(mdw-define-face magit-diff-added-highlight
+  (((class color) (type x)) :foreground "#cceecc" :background "#336633")
+  (((class color) (type tty)) :foreground "green" :background "blue"))
+(mdw-define-face magit-diff-removed
+  (((class color) (type x)) :foreground "#ffdddd" :background "#553333")
+  (((class color) (type tty)) :foreground "red"))
+(mdw-define-face magit-diff-removed-highlight
+  (((class color) (type x)) :foreground "#eecccc" :background "#663333")
+  (((class color) (type tty)) :foreground "red" :background "blue"))
+
 (mdw-define-face dylan-header-background
   (((class color) (type x)) :background "NavyBlue")
   (t :background "blue"))
 
-(mdw-define-face magit-diff-add
-  (t :foreground "green"))
-(mdw-define-face magit-diff-del
-  (t :foreground "red"))
-(mdw-define-face magit-diff-file-header
-  (t :weight bold))
-(mdw-define-face magit-diff-hunk-header
-  (t :foreground "SkyBlue1"))
-(mdw-define-face magit-item-highlight
-  (((type tty)) :background "blue")
-  (t :background "grey11"))
-(mdw-define-face magit-log-head-label-remote
-  (((type tty)) :background "cyan" :foreground "green")
-  (t :background "grey11" :foreground "DarkSeaGreen2" :box t))
-(mdw-define-face magit-log-head-label-local
-  (((type tty)) :background "cyan" :foreground "yellow")
-  (t :background "grey11" :foreground "LightSkyBlue1" :box t))
-(mdw-define-face magit-log-head-label-tags
-  (((type tty)) :background "red" :foreground "yellow")
-  (t :background "LemonChiffon1" :foreground "goldenrod4" :box t))
-(mdw-define-face magit-log-graph
-  (((type tty)) :foreground "magenta")
-  (t :foreground "grey80"))
-
 (mdw-define-face erc-input-face
   (t :foreground "red"))
 
@@ -1826,6 +1889,10 @@ name, as a symbol."
 	   (list "\\(\\s.\\|\\s(\\|\\s)\\|\\s\\\\|\\s/\\)"
 		 '(0 mdw-punct-face))))))
 
+(define-derived-mode sod-mode c-mode "Sod"
+  "Major mode for editing Sod code.")
+(push '("\\.sod$" . sod-mode) auto-mode-alist)
+
 ;;;--------------------------------------------------------------------------
 ;;; AP calc mode.
 
@@ -2364,13 +2431,13 @@ name, as a symbol."
 	  (list
 
 	   ;; Handle the keywords defined above.
-	   (list (concat "\\<\\(" rust-keywords "\\)\\>")
+	   (list (concat "\\_<\\(" rust-keywords "\\)\\_>")
 		 '(0 font-lock-keyword-face))
-	   (list (concat "\\<\\(" rust-builtins "\\)\\>")
+	   (list (concat "\\_<\\(" rust-builtins "\\)\\_>")
 		 '(0 font-lock-variable-name-face))
 
 	   ;; Handle numbers too.
-	   (list (concat "\\<\\("
+	   (list (concat "\\_<\\("
 			       "[0-9][0-9_]*"
 			       "\\(" "\\(\\.[0-9_]+\\)?[eE][-+]?[0-9_]+"
 			       "\\|" "\\.[0-9_]+"
@@ -2382,7 +2449,7 @@ name, as a symbol."
 			       "\\|" "0b[01_]+"
 			       "\\)"
 			       "\\([ui]\\(8\\|16\\|32\\|64\\|s\\|size\\)\\)?"
-			 "\\)\\>")
+			 "\\)\\_>")
 		 '(0 mdw-number-face))
 
 	   ;; And anything else is punctuation.
@@ -2567,13 +2634,56 @@ strip numbers instead."
 (defun mdw-fontify-pyrex ()
   (mdw-fontify-pythonic
    (mdw-regexps "and" "as" "assert" "break" "cdef" "class" "continue"
-		"ctypedef" "def" "del" "elif" "else" "except" "exec"
+		"ctypedef" "def" "del" "elif" "else" "enum" "except" "exec"
 		"extern" "finally" "for" "from" "global" "if"
 		"import" "in" "is" "lambda" "not" "or" "pass" "print"
-		"raise" "return" "struct" "try" "while" "with"
+		"property" "raise" "return" "struct" "try" "while" "with"
 		"yield")))
 
 ;;;--------------------------------------------------------------------------
+;;; Lua programming style.
+
+(setq lua-indent-level 2)
+
+(defun mdw-fontify-lua ()
+
+  ;; Miscellaneous fiddling.
+  (mdw-standard-fill-prefix "\\([ \t]*#+[ \t]*\\)")
+
+  ;; Now define fontification things.
+  (make-local-variable 'font-lock-keywords)
+  (let ((lua-keywords
+	 (mdw-regexps "and" "break" "do" "else" "elseif" "end"
+		      "false" "for" "function" "goto" "if" "in" "local"
+		      "nil" "not" "or" "repeat" "return" "then" "true"
+		      "until" "while")))
+    (setq font-lock-keywords
+	  (list
+
+	   ;; Set up the keywords defined above.
+	   (list (concat "\\_<\\(" lua-keywords "\\)\\_>")
+		 '(0 font-lock-keyword-face))
+
+	   ;; At least numbers are simpler than C.
+	   (list (concat "\\_<\\(" "0[xX]"
+				   "\\(" "[0-9a-fA-F]+"
+					 "\\(\\.[0-9a-fA-F]*\\)?"
+				   "\\|" "\\.[0-9a-fA-F]+"
+				   "\\)"
+				   "\\([pP][-+]?[0-9]+\\)?"
+			     "\\|" "\\(" "[0-9]+"
+					 "\\(\\.[0-9]*\\)?"
+				   "\\|" "\\.[0-9]+"
+				   "\\)"
+				   "\\([eE][-+]?[0-9]+\\)?"
+			     "\\)")
+		 '(0 mdw-number-face))
+
+	   ;; And anything else is punctuation.
+	   (list "\\(\\s.\\|\\s(\\|\\s)\\|\\s\\\\|\\s/\\)"
+		 '(0 mdw-punct-face))))))
+
+;;;--------------------------------------------------------------------------
 ;;; Icon programming style.
 
 ;; Icon indentation style.
@@ -3052,7 +3162,7 @@ strip numbers instead."
   (local-set-key [?$] 'self-insert-command)
 
   ;; Make `tab' be useful, given that tab stops in TeX don't work well.
-  (local-set-key "\C-i" 'indent-relative)
+  (local-set-key "\C-\M-i" 'indent-relative)
   (setq indent-tabs-mode nil)
 
   ;; Set fill prefix.
@@ -3109,6 +3219,25 @@ strip numbers instead."
 	 (list "[$^_{}#&]"
 	       '(0 mdw-punct-face)))))
 
+(eval-after-load 'font-latex
+  '(defun font-latex-jit-lock-force-redisplay (buf start end)
+     "Compatibility for Emacsen not offering `jit-lock-force-redisplay'."
+     ;; The following block is an expansion of `jit-lock-force-redisplay'
+     ;; and involved macros taken from CVS Emacs on 2007-04-28.
+     (with-current-buffer buf
+       (let ((modified (buffer-modified-p)))
+	 (unwind-protect
+	     (let ((buffer-undo-list t)
+		   (inhibit-read-only t)
+		   (inhibit-point-motion-hooks t)
+		   (inhibit-modification-hooks t)
+		   deactivate-mark
+		   buffer-file-name
+		   buffer-file-truename)
+	       (put-text-property start end 'fontified t))
+	   (unless modified
+	     (restore-buffer-modified-p nil)))))))
+
 ;;;--------------------------------------------------------------------------
 ;;; SGML hacking.
 
@@ -3552,6 +3681,9 @@ that character only to be normal punctuation.")
    "\\([ \t]*\\([>#|:] ?\\)*[ \t]*\\)" 3)
   (auto-fill-mode 1))
 
+(eval-after-load "flyspell"
+  '(define-key flyspell-mode-map "\C-\M-i" nil))
+
 ;;;--------------------------------------------------------------------------
 ;;; Outline and hide/show modes.
 
@@ -3630,6 +3762,267 @@ This allows you to pass a list of arguments through `ansi-term'."
   (grep command-args))
 
 ;;;--------------------------------------------------------------------------
+;;; Magit configuration.
+
+(setq magit-diff-refine-hunk 'all
+      magit-view-git-manual-method 'man
+      magit-log-margin '(nil age magit-log-margin-width t 18)
+      magit-wip-after-save-local-mode-lighter ""
+      magit-wip-after-apply-mode-lighter ""
+      magit-wip-before-change-mode-lighter "")
+(eval-after-load "magit"
+  '(progn (global-magit-file-mode 1)
+	  (magit-wip-after-save-mode 1)
+	  (magit-wip-after-apply-mode 1)
+	  (magit-wip-before-change-mode 1)
+	  (add-to-list 'magit-no-confirm 'safe-with-wip)
+	  (push '(:eval (if (or magit-wip-after-save-local-mode
+				magit-wip-after-apply-mode
+				magit-wip-before-change-mode)
+			    (format " wip:%s%s%s"
+				    (if magit-wip-after-apply-mode "A" "")
+				    (if magit-wip-before-change-mode "C" "")
+				    (if magit-wip-after-save-local-mode "S" ""))))
+		minor-mode-alist)
+	  (dolist (popup '(magit-diff-popup
+			   magit-diff-refresh-popup
+			   magit-diff-mode-refresh-popup
+			   magit-revision-mode-refresh-popup))
+	    (magit-define-popup-switch popup ?R "Reverse diff" "-R"))))
+
+(setq magit-repolist-columns
+      '(("Name" 16 magit-repolist-column-ident nil)
+	("Version" 18 magit-repolist-column-version nil)
+	("St" 2 magit-repolist-column-dirty nil)
+	("L<U" 3 mdw-repolist-column-unpulled-from-upstream nil)
+	("L>U" 3 mdw-repolist-column-unpushed-to-upstream nil)
+	("Path" 32 magit-repolist-column-path nil)))
+
+(setq magit-repository-directories '(("~/etc/profile" . 0)
+				     ("~/src/" . 1)))
+
+(defadvice magit-list-repos (around mdw-dirname () activate compile)
+  "Make sure the returned names are directory names.
+Otherwise child processes get started in the wrong directory and
+there is sadness."
+  (setq ad-return-value (mapcar #'file-name-as-directory ad-do-it)))
+
+(defun mdw-repolist-column-unpulled-from-upstream (_id)
+  "Insert number of upstream commits not in the current branch."
+  (let ((upstream (magit-get-upstream-branch (magit-get-current-branch) t)))
+    (and upstream
+	 (let ((n (cadr (magit-rev-diff-count "HEAD" upstream))))
+	   (propertize (number-to-string n) 'face
+		       (if (> n 0) 'bold 'shadow))))))
+
+(defun mdw-repolist-column-unpushed-to-upstream (_id)
+  "Insert number of commits in the current branch but not its upstream."
+  (let ((upstream (magit-get-upstream-branch (magit-get-current-branch) t)))
+    (and upstream
+	 (let ((n (car (magit-rev-diff-count "HEAD" upstream))))
+	   (propertize (number-to-string n) 'face
+		       (if (> n 0) 'bold 'shadow))))))
+
+;;;--------------------------------------------------------------------------
+;;; MPC configuration.
+
+(eval-when-compile (trap (require 'mpc)))
+
+(setq mpc-browser-tags '(Artist|Composer|Performer Album|Playlist))
+
+(defun mdw-mpc-now-playing ()
+  (interactive)
+  (require 'mpc)
+  (save-excursion
+    (set-buffer (mpc-proc-cmd (mpc-proc-cmd-list '("status" "currentsong"))))
+    (mpc--status-callback))
+  (let ((state (cdr (assq 'state mpc-status))))
+    (cond ((member state '("stop"))
+	   (message "mpd stopped."))
+	  ((member state '("play" "pause"))
+	   (let* ((artist (cdr (assq 'Artist mpc-status)))
+		  (album (cdr (assq 'Album mpc-status)))
+		  (title (cdr (assq 'Title mpc-status)))
+		  (file (cdr (assq 'file mpc-status)))
+		  (duration-string (cdr (assq 'Time mpc-status)))
+		  (time-string (cdr (assq 'time mpc-status)))
+		  (time (and time-string
+			     (string-to-number
+			      (if (string-match ":" time-string)
+				  (substring time-string
+					     0 (match-beginning 0))
+				(time-string)))))
+		  (duration (and duration-string
+				 (string-to-number duration-string)))
+		  (pos (and time duration
+			    (format " [%d:%02d/%d:%02d]"
+				    (/ time 60) (mod time 60)
+				    (/ duration 60) (mod duration 60))))
+		  (fmt (cond ((and artist title)
+			      (format "`%s' by %s%s" title artist
+				      (if album (format ", from `%s'" album)
+					"")))
+			     (file
+			      (format "`%s' (no tags)" file))
+			     (t
+			      "(no idea what's playing!)"))))
+	     (if (string= state "play")
+		 (message "mpd playing %s%s" fmt (or pos ""))
+	       (message "mpd paused in %s%s" fmt (or pos "")))))
+	  (t
+	   (message "mpd in unknown state `%s'" state)))))
+
+(defmacro mdw-define-mpc-wrapper (func bvl interactive &rest body)
+  `(defun ,func ,bvl
+     (interactive ,@interactive)
+     (require 'mpc)
+     ,@body
+     (mdw-mpc-now-playing)))
+
+(mdw-define-mpc-wrapper mdw-mpc-play-or-pause () nil
+  (if (member (cdr (assq 'state (mpc-cmd-status))) '("play"))
+      (mpc-pause)
+    (mpc-play)))
+
+(mdw-define-mpc-wrapper mdw-mpc-next () nil (mpc-next))
+(mdw-define-mpc-wrapper mdw-mpc-prev () nil (mpc-prev))
+(mdw-define-mpc-wrapper mdw-mpc-stop () nil (mpc-stop))
+
+(defun mdw-mpc-louder (step)
+  (interactive (list (if current-prefix-arg
+			 (prefix-numeric-value current-prefix-arg)
+		       +10)))
+  (mpc-proc-cmd (format "volume %+d" step)))
+
+(defun mdw-mpc-quieter (step)
+  (interactive (list (if current-prefix-arg
+			 (prefix-numeric-value current-prefix-arg)
+		       +10)))
+  (mpc-proc-cmd (format "volume %+d" (- step))))
+
+(defun mdw-mpc-hack-lines (arg interactivep func)
+  (if (and interactivep (use-region-p))
+      (let ((from (region-beginning)) (to (region-end)))
+	(goto-char from)
+	(beginning-of-line)
+	(funcall func)
+	(forward-line)
+	(while (< (point) to)
+	  (funcall func)
+	  (forward-line)))
+    (let ((n (prefix-numeric-value arg)))
+      (cond ((minusp n)
+	     (unless (bolp)
+	       (beginning-of-line)
+	       (funcall func)
+	       (incf n))
+	     (while (minusp n)
+	       (forward-line -1)
+	       (funcall func)
+	       (incf n)))
+	    (t
+	     (beginning-of-line)
+	     (while (plusp n)
+	       (funcall func)
+	       (forward-line)
+	       (decf n)))))))
+
+(defun mdw-mpc-select-one ()
+  (when (and (get-char-property (point) 'mpc-file)
+	     (not (get-char-property (point) 'mpc-select)))
+    (mpc-select-toggle)))
+
+(defun mdw-mpc-unselect-one ()
+  (when (get-char-property (point) 'mpc-select)
+    (mpc-select-toggle)))
+
+(defun mdw-mpc-select (&optional arg interactivep)
+  (interactive (list current-prefix-arg t))
+  (mdw-mpc-hack-lines arg interactivep 'mdw-mpc-select-one))
+
+(defun mdw-mpc-unselect (&optional arg interactivep)
+  (interactive (list current-prefix-arg t))
+  (mdw-mpc-hack-lines arg interactivep 'mdw-mpc-unselect-one))
+
+(defun mdw-mpc-unselect-backwards (arg)
+  (interactive "p")
+  (mdw-mpc-hack-lines (- arg) t 'mdw-mpc-unselect-one))
+
+(defun mdw-mpc-unselect-all ()
+  (interactive)
+  (setq mpc-select nil)
+  (mpc-selection-refresh))
+
+(defun mdw-mpc-next-line (arg)
+  (interactive "p")
+  (beginning-of-line)
+  (forward-line arg))
+
+(defun mdw-mpc-previous-line (arg)
+  (interactive "p")
+  (beginning-of-line)
+  (forward-line (- arg)))
+
+(defun mdw-mpc-playlist-add (&optional arg interactivep)
+  (interactive (list current-prefix-arg t))
+  (let ((mpc-select mpc-select))
+    (when (or arg (and interactivep (use-region-p)))
+      (setq mpc-select nil)
+      (mdw-mpc-hack-lines arg interactivep 'mdw-mpc-select-one))
+    (setq mpc-select (reverse mpc-select))
+    (mpc-playlist-add)))
+
+(defun mdw-mpc-playlist-delete (&optional arg interactivep)
+  (interactive (list current-prefix-arg t))
+  (setq mpc-select (nreverse mpc-select))
+  (mpc-select-save
+    (when (or arg (and interactivep (use-region-p)))
+      (setq mpc-select nil)
+      (mpc-selection-refresh)
+      (mdw-mpc-hack-lines arg interactivep 'mdw-mpc-select-one))
+      (mpc-playlist-delete)))
+
+(defun mdw-mpc-hack-tagbrowsers ()
+  (setq-local mode-line-format
+	      '("%e"
+		mode-line-frame-identification
+		mode-line-buffer-identification)))
+(add-hook 'mpc-tagbrowser-mode-hook 'mdw-mpc-hack-tagbrowsers)
+
+(defun mdw-mpc-hack-songs ()
+  (setq-local header-line-format
+	      ;; '("MPC " mpc-volume " " mpc-current-song)
+	      (list (propertize " " 'display '(space :align-to 0))
+		    ;; 'mpc-songs-format-description
+		    '(:eval
+		      (let ((deactivate-mark) (hscroll (window-hscroll)))
+			(with-temp-buffer
+			  (mpc-format mpc-songs-format 'self hscroll)
+			  ;; That would be simpler than the hscroll handling in
+			  ;; mpc-format, but currently move-to-column does not
+			  ;; recognize :space display properties.
+			  ;; (move-to-column hscroll)
+			  ;; (delete-region (point-min) (point))
+			  (buffer-string)))))))
+(add-hook 'mpc-songs-mode-hook 'mdw-mpc-hack-songs)
+
+(eval-after-load "mpc"
+  '(progn
+     (define-key mpc-mode-map "m" 'mdw-mpc-select)
+     (define-key mpc-mode-map "u" 'mdw-mpc-unselect)
+     (define-key mpc-mode-map "\177" 'mdw-mpc-unselect-backwards)
+     (define-key mpc-mode-map "\e\177" 'mdw-mpc-unselect-all)
+     (define-key mpc-mode-map "n" 'mdw-mpc-next-line)
+     (define-key mpc-mode-map "p" 'mdw-mpc-previous-line)
+     (define-key mpc-mode-map "/" 'mpc-songs-search)
+     (setq mpc-songs-mode-map (make-sparse-keymap))
+     (set-keymap-parent mpc-songs-mode-map mpc-mode-map)
+     (define-key mpc-songs-mode-map "l" 'mpc-playlist)
+     (define-key mpc-songs-mode-map "+" 'mdw-mpc-playlist-add)
+     (define-key mpc-songs-mode-map "-" 'mdw-mpc-playlist-delete)
+     (define-key mpc-songs-mode-map "\r" 'mpc-songs-jump-to)))
+
+;;;--------------------------------------------------------------------------
 ;;; Inferior Emacs Lisp.
 
 (setq comint-prompt-read-only t)