add fish integration

* eat.el (eat-default-shell-function, eat-shell)
(eat-tramp-shells): New user option.
* eat.el (eat-default-shell): New function.
* eat.el (eat--1, eat): Call the function specified in
'eat-default-shell-function' to get the default shell.
* eat.texi (Changing Shell): New chapter.

ChangeLog

@@ -1,3 +1,27 @@
+2023-12-15  Akib Azmain Turja  <akib@disroot.org>
+
+	Don't let automatic scrolling mess up the display
+
+	* eat.el (eat-mode, eat--eshell-local-mode): Set both
+	'scroll-margin' and 'hscroll-margin' to zero.
+
+2023-10-26  Akib Azmain Turja  <akib@disroot.org>
+
+	Don't queue input
+
+	* eat.el (eat--pending-input-chunks)
+	(eat--defer-input-processing, eat--process-input-queue-timer):
+	Remove.
+	All references updated.
+	* eat.el (eat--send-input): Send the input immediately.
+	* eat.el (eat--process-input-queue): Remove.
+	* eat.el (eat--eshell-process-output-queue)
+	(eat--process-output-queue): Loop while output queue isn't
+	empty, set 'eat--output-queue-first-chunk-time' to 't' in the
+	loop.
+	* eat.el (eat--filter, eat--eshell-filter): Don't start a timer
+	if 'eat--output-queue-first-chunk-time' is 't'.
+
 2023-10-19  Akib Azmain Turja  <akib@disroot.org>
 
 	* eat.ti (eat-mono): Remove unused capability 'Ed'

README.org

@@ -35,13 +35,13 @@ To start Eat, run =M-x eat=.  Eat has four input modes:
   - =C-c C-k=: Kill process.
   - =C-c C-e=: Switch to "emacs" input mode.
   - =C-c M-d=: Switch to "char" input mode.
-  - =C-c C-e=: Switch to "line" input mode.
+  - =C-c C-l=: Switch to "line" input mode.
 
 - "emacs" mode: No special keybinding, except the following:
 
   - =C-c C-j=: Switch to "semi-char" input mode.
   - =C-c M-d=: Switch to "char" input mode.
-  - =C-c C-e=: Switch to "line" input mode.
+  - =C-c C-l=: Switch to "line" input mode.
   - =C-c C-k=: Kill process.
 
 - "char" mode: All supported keys are bound to send the key to the

eat.el

@@ -4,7 +4,7 @@
 
 ;; Author: Akib Azmain Turja <akib@disroot.org>
 ;; Created: 2022-08-15
-;; Version: 0.9.3
+;; Version: 0.9.4
 ;; Package-Requires: ((emacs "26.1") (compat "29.1"))
 ;; Keywords: terminals processes
 ;; Homepage: https://codeberg.org/akib/emacs-eat
@@ -89,6 +89,8 @@
 (require 'shell)
 (require 'term)
 (require 'url)
+(require 'tramp)
+(require 'term/xterm)
 
 ;; Needed by `eat-reload'.
 (defvar eat--being-loaded nil
@@ -117,6 +119,26 @@
   "Eat Eshell integration."
   :group 'eat)
 
+(defcustom eat-default-shell-function #'eat-default-shell
+  "Function to call to get the default shell to run."
+  :type 'function
+  :group 'eat-ui)
+
+(defcustom eat-shell (or explicit-shell-file-name
+                         (getenv "ESHELL")
+                         shell-file-name)
+  "Default shell to run."
+  :type 'string
+  :group 'eat-ui)
+
+(defcustom eat-tramp-shells '(("docker" . "/bin/sh"))
+  "Alist specifying the shells to run in Tramp.
+
+Each element of form (TRAMP-METHOD . SHELL), where SHELL corresponds
+to the default shell for remote directories using TRAMP-METHOD."
+  :type '(alist :key-type string :value-type string)
+  :group 'eat-ui)
+
 (defcustom eat-buffer-name "*eat*"
   "The basename used for Eat buffers.
 
@@ -5829,6 +5851,7 @@ EVENT is the mouse event."
                 #'eat-line-previous-matching-input-from-input)
     (define-key map [?\C-c ?\M-s]
                 #'eat-line-next-matching-input-from-input)
+    (define-key map [xterm-paste] #'xterm-paste)
     map)
   "Keymap for Eat line mode.")
 
@@ -6582,6 +6605,8 @@ END if it's safe to do so."
           glyphless-char-display
           cursor-type
           track-mouse
+          scroll-margin
+          hscroll-margin
           eat-terminal
           eat--synchronize-scroll-function
           eat--mouse-grabbing-type
@@ -6604,6 +6629,8 @@ END if it's safe to do so."
           eat--shell-prompt-annotation-correction-timer))
   ;; This is intended; input methods don't work on read-only buffers.
   (setq buffer-read-only nil)
+  (setq scroll-margin 0)
+  (setq hscroll-margin 0)
   (setq eat--synchronize-scroll-function #'eat--synchronize-scroll)
   (setq filter-buffer-substring-function
         #'eat--filter-buffer-substring)
@@ -7038,14 +7065,19 @@ PROGRAM."
       (eat-exec buffer name program startfile switches))
     buffer))
 
+(defun eat-default-shell ()
+  "Return a shell to run."
+  (or (and (file-remote-p default-directory)
+           (with-parsed-tramp-file-name default-directory nil
+             (alist-get method eat-tramp-shells nil nil 'equal)))
+      eat-shell))
+
 (defun eat--1 (program arg display-buffer-fn)
   "Start a new Eat terminal emulator in a buffer.
 
 PROGRAM and ARG is same as in `eat' and `eat-other-window'.
 DISPLAY-BUFFER-FN is the function to display the buffer."
-  (let ((program (or program (or explicit-shell-file-name
+  (let ((program (or program (funcall eat-default-shell-function)))
-                                 (getenv "ESHELL")
-                                 shell-file-name)))
         (buffer
          (cond
           ((numberp arg)
@@ -7084,9 +7116,7 @@ PROGRAM can be a shell command."
   (interactive
    (list (when (equal current-prefix-arg '(16))
            (read-shell-command "Run program: "
-                               (or explicit-shell-file-name
+                               (funcall eat-default-shell-function)))
-                                   (getenv "ESHELL")
-                                   shell-file-name)))
          current-prefix-arg))
   (eat--1 program arg #'pop-to-buffer-same-window))
 
@@ -7553,6 +7583,8 @@ symbol `buffer', in which case the point of current buffer is set."
   :interactive nil
   (let ((locals '(cursor-type
                   glyphless-char-display
+                  scroll-margin
+                  hscroll-margin
                   track-mouse
                   filter-buffer-substring-function
                   eat-terminal
@@ -7565,6 +7597,8 @@ symbol `buffer', in which case the point of current buffer is set."
     (cond
      (eat--eshell-local-mode
       (mapc #'make-local-variable locals)
+      (setq scroll-margin 0)
+      (setq hscroll-margin 0)
       (setq eat--synchronize-scroll-function
             #'eat--eshell-synchronize-scroll)
       (setq filter-buffer-substring-function

eat.texi

@@ -2,8 +2,8 @@
 
 @comment %**start of header
 @setfilename eat.info
-@set UPDATED 19 October 2023
+@set UPDATED 15 December 2023
-@set VERSION 0.9.3
+@set VERSION 0.9.4
 @documentencoding UTF-8
 @codequotebacktick on
 @codequoteundirected on
@@ -67,6 +67,7 @@ Basic Operations
 Advanced Customizations
 * Shell Integration::   Getting the most from Eat and your shell.
 * Querying Before Kill::  Confirming before you kill your terminal.
+* Changing Shell::      Changing the default shell.
 * Display::             The region where everything is shown.
 * Scrollback::          Region for things that went out of display.
 * Cursor Types::        Cursor can displayed in many forms.
@@ -74,6 +75,7 @@ Advanced Customizations
 * Clipboard::           Integrating kill ring with terminal.
 * Colors::              Eat can show more than sixteen million colors.
 * Fonts::               Eat can show up to sixteen different fonts.
+* Sixel::               Eat can render Sixel graphics.
 * Blinking Text::       Annoying blinking texts.
 * Performance Tuning::  Fine tuning to maximize performance.
 
@@ -460,11 +462,11 @@ By default, every keystroke gets recorded in the lossage, which can be
 seen by pressing @kbd{C-h l}.  This is actually a good thing, unless
 you're inputting password.
 
-@findex eat-send-command
+@findex eat-send-password
 Emacs doesn't record keystrokes when a password is read from the
 minibuffer.  However, when the password prompt is in the terminal, the
 keys you use to type in your password gets recorded.  To prevent this
-from happening, you can use the command @command{eat-send-command},
+from happening, you can use the command @command{eat-send-password},
 it'll read password from the minibuffer and send it.  Since the
 password is read from the minibuffer, it's not recorded.
 
@@ -676,6 +678,39 @@ integration code is executed on shell); before that it is essentially
 same as @code{t}, and Eat will always query.
 @end defopt
 
+@node Changing Shell
+@cindex changing default shell
+@cindex changing shell
+@cindex shell, default, changing
+@cindex default, shell changing
+@cindex shell, changing shell
+@chapter Changing the Default Shell
+
+Eat automatically uses a reasonable shell by default.  However you can
+customize it.
+
+@vindex eat-shell
+@defopt eat-shell
+The default shell to run.
+@end defopt
+
+@vindex eat-tramp-shells
+@defopt eat-tramp-shells
+This user options allows you to customize default shell for each Tramp
+method.  It's an alist and it's elements are of form (TRAMP-METHOD
+SHELL).
+@end defopt
+
+@vindex eat-default-shell-function
+@defopt eat-default-shell-function
+This user options gives more control on the default shell.  It
+specifies a function to call without any argument, whose return value
+is used as the default shell.
+
+If you change this from the default value, @code{eat-shell} and
+@code{eat-tramp-shells} won't work.
+@end defopt
+
 @node Display
 @cindex display
 @chapter Display
@@ -944,7 +979,7 @@ normal.  Faint text uses the face @code{eat-term-faint}.
 @cindex text, slant
 @vindex eat-term-italic
 Programs may request the terminal to show italic text too.  Italic
-text uses the customizable face @code{eat-term-faint}.
+text uses the customizable face @code{eat-term-italic}.
 
 @cindex font family
 @cindex text, font family

integration/fish

@@ -0,0 +1,95 @@
+# integration/fish --- Fish integration
+
+# Copyright (C) 2022-2024 Akib Azmain Turja.
+
+# This file is not part of GNU Emacs.
+
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# For a full copy of the GNU General Public License
+# see <https://www.gnu.org/licenses/>.
+
+
+# Features missing compared to the bash/zsh integrations:
+# - Fish history import into Emacs.
+# - The prompt markers are not portable, they depend on a specific prompt customization.
+# - The PS2 prompt support (line continuation).
+
+function eat_enable_integration
+    set -g __eat_integration_enabled yes
+
+    function __eat_chpwd --on-variable PWD
+        # Send the current working directory, for directory tracking.
+        printf '\e]51;e;A;%s;%s\e\\\\'         \
+            "$(echo -n -- $hostname | base64)" \
+            "$(echo -n -- $PWD | base64)"
+    end
+
+    function __eat_preexec --on-event fish_preexec
+        set current_command $argv[1]
+        # Send current command.
+        printf '\e]51;e;F;%s\e\\\\' \
+            "$(echo -n -- $current_command | base64)"
+
+        # Send pre-exec sequence.
+        printf '\e]51;e;G\e\\\\'
+
+        # Update title to include the command running.
+        # "${PWD/$HOME/'~'}" converts "/home/akib/foo/" to "~/foo/".
+        # The next one is substituted with '$', or '#' if we're "root".
+        printf '\e]2;%s@%s:%s%s\e\\\\' "$USER" "$hostname" \
+            "$(string replace $HOME '~' $PWD)"             \
+            "$(fish_is_root_user && echo '#' || echo '$')" \
+            "$current_command"
+    end
+
+    function __eat_postexec --on-event fish_postexec
+        set exit_status $status
+        # Send exit status.
+        printf '\e]51;e;H;%i\e\\\\' $exit_status
+
+        # Inform that a new prompt is going to be printed.
+        printf '\e]51;e;J\e\\\\'
+
+        # Update title.
+        # "${PWD/$HOME/'~'}" converts "/home/akib/org/" to "~/org/".
+        # The next one is substituted with '$', or '#' if we're "root".
+        printf '\e]2;%s@%s:%s%s\e\\\\' "$USER" "$hostname" \
+            "$(string replace $HOME '~' $PWD)"             \
+            "$(fish_is_root_user && echo '#' || echo '$')"
+    end
+
+    # FIXME: These are custom variables for a modified prompt, not native to Fish.
+    set --global --prepend fish_before_prompt \
+        (printf '\e]51;e;B\e\\\\')
+    set --global --append  fish_after_prompt  \
+        (printf '\e]51;e;C\e\\\\')
+end
+
+function _eat_msg
+    set msg (printf '\e]51;e;M')
+    for arg in $argv
+        set msg $msg "$(echo -n -- $arg | base64)"
+    end
+    printf "%s\e\\\\" (string join ";" $msg)
+end
+
+if status is-interactive
+    and test -z $__eat_integration_enabled
+    and set -q EAT_SHELL_INTEGRATION_DIR
+    and string match -q "eat-*" $TERM
+
+    eat_enable_integration
+end
+
+# Local Variables:
+# mode: fish
+# End: