Add shell integration script for GNU Bash

* integration/bash: New file.
* eat.el (eat-term-shell-integration-directory): New variable.
Contains path to the directory containing the scripts,
automatically updated when Eat is updated.
* eat.el (eat-exec, eat-eshell-mode): New enviroment variable
'EAT_SHELL_INTEGRATION_DIR'.
* eat.texi (Shell Integration): New chapter.
* eat.texi (Directory Tracking): Refer to 'Shell Integration'.

eat.el

@@ -255,6 +255,7 @@ This value is used by terminal programs to identify the terminal."
   "Path to directory where Eat is installed.")
 
 (defvar eat-term-terminfo-directory)
+(defvar eat-term-shell-integration-directory)
 (let ((old-install-path eat--install-path))
   (setq eat--install-path
         (copy-sequence
@@ -262,15 +263,27 @@ This value is used by terminal programs to identify the terminal."
                                   buffer-file-name))))
 
   (defcustom eat-term-terminfo-directory eat--install-path
-    "Directory where require terminfo databases can be found.
+    "Directory where required terminfo databases can be found.
 
 This value is used by terminal programs to find the terminfo databases
 that describe the capabilities of the terminal."
     :type 'directory
     :group 'eat-term)
 
+  (defcustom eat-term-shell-integration-directory
+    (expand-file-name "integration" eat--install-path)
+    "Directory where Eat shell integration scripts can be found.
+
+This value is exposed to terminal programs as
+`EAT_SHELL_INTEGRATION_DIR' environment variable."
+    :type 'directory
+    :group 'eat-ui
+    :group 'eat-eshell)
+
   (when (eq eat-term-terminfo-directory old-install-path)
-    (setq eat-term-terminfo-directory eat--install-path)))
+    (setq eat-term-terminfo-directory eat--install-path
+          eat-term-shell-integration-directory
+          (expand-file-name "integration" eat--install-path))))
 
 (defcustom eat-term-inside-emacs (format "%s,eat" emacs-version)
   "Value for the `INSIDE_EMACS' environment variable."
@@ -2212,7 +2225,6 @@ MODE should be one of nil and `x10', `normal', `button-event',
 
 URL should be a URL in the format \"file://HOST/CWD/\"; HOST can be
 empty."
-  (message "%S" url)
   (let ((obj (url-generic-parse-url url)))
     (when (and (string= (url-type obj) "file")
                (or (null (url-host obj))
@@ -4563,7 +4575,9 @@ same Eat buffer.  The hook `eat-exec-hook' is run after each exec."
                (list
                 (concat "TERM=" (eat-term-name))
                 (concat "TERMINFO=" eat-term-terminfo-directory)
-                (concat "INSIDE_EMACS=" eat-term-inside-emacs))
+                (concat "INSIDE_EMACS=" eat-term-inside-emacs)
+                (concat "EAT_SHELL_INTEGRATION_DIR="
+                        eat-term-shell-integration-directory))
                process-environment))
              (process-connection-type t)
              ;; We should suppress conversion of end-of-line format.
@@ -5103,6 +5117,8 @@ sane 2>%s ; if [ $1 = .. ]; then shift; fi; exec \"$@\""
           `(("TERM" eat--eshell-term-name t)
             ("TERMINFO" eat-term-terminfo-directory t)
             ("INSIDE_EMACS" eat-term-inside-emacs t)
+            ("EAT_SHELL_INTEGRATION_DIR"
+             eat-term-shell-integration-directory t)
             ,@eshell-variable-aliases-list))
     (advice-add #'eshell-gather-process-output :around
                 #'eat--eshell-adjust-make-process-args))

eat.texi

@@ -71,6 +71,7 @@ Advanced Customizations
 * Mouse Tracking::      Eat tracks mouse, but this can be changed.
 * Clipboard::           Integrating kill ring with terminal.
 * Directory Tracking::  Tracking the working directory of program.
+* Shell Integration::   Getting the most from Eat and your shell.
 * Colors::              Eat can show more than sixteen million colors.
 * Fonts::               Eat can show up to sixty font different fonts.
 * Blinking Text::       Annoying blinking texts.
@@ -486,9 +487,10 @@ directory is changed back to the directory from where the program was
 invoked.
 
 To track, Eat needs the program to send this information.  So, to
-enable directory tracking, you'll need to setup your shell.  You'll
-need to arrange that your shell sends appropriate escape sequence at
-each prompt, for example with the command:
+enable directory tracking, you'll need to setup your shell
+(@pxref{Shell Integration}).  You'll need to arrange that your shell
+sends appropriate escape sequence at each prompt, for example with the
+command:
 
 @example
 printf "\\e]7;file://%s%s\\e\\\\" "$HOSTNAME" "$PWD"
@@ -503,6 +505,24 @@ This controls directory tracking.  When set to non-@code{nil}, Eat
 tracks the current working directory of programs.
 @end defopt
 
+@node Shell Integration
+@cindex shell integration
+@cindex integration, shell
+@chapter Shell Integration
+
+Eat comes with shell scripts to integrate your favorite shell with
+Eat.  You can include the script in your shell configuration file,
+it'll take care of everything.
+
+Currently only GNU Bash is supported.
+
+If you use GNU Bash, put the following in your @samp{.bashrc} file:
+
+@example
+[ -n "$EAT_SHELL_INTEGRATION_DIR" ] && \
+  source "$EAT_SHELL_INTEGRATION_DIR/bash"
+@end example
+
 @node Colors
 @cindex colors
 @cindex customizing colors

integration/bash

@@ -0,0 +1,11 @@
+function _eat_prompt_command () {
+  # Send the current working directory, for directory tracking.
+  printf "\\e]7;file://%s%s\\e\\\\" "$HOSTNAME" "$PWD"
+}
+
+# Add '_eat_prompt_command' as the last element of 'PROMPT_COMMAND'.
+PROMPT_COMMAND[${#PROMPT_COMMAND[*]}]=_eat_prompt_command
+
+# Local Variables:
+# mode: sh
+# End: