eat update (integration)

eat/integration/bash

@@ -0,0 +1,134 @@
+# integration/bash --- Bash integration
+
+# Copyright (C) 2022 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/>.
+
+__eat_prompt_command () {
+  # Send exit status.
+  if test -n "$__eat_current_command"
+  then
+    printf '\e]51;e;H;%i\e\\' "$__eat_exit_status"
+  fi
+  __eat_current_command=""
+  # Inform that a new prompt is going to be printed.
+  printf '\e]51;e;J\e\\'
+  # Send the current working directory, for directory tracking.
+  printf '\e]51;e;A;%s;%s\e\\' "$(printf "%s" "$HOSTNAME" | base64)" \
+         "$(printf "%s" "$PWD" | base64)"
+  # 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" "$HOSTNAME" \
+         "${PWD/$HOME/'~'}" \
+         "$(test $UID -eq 0 && echo '#' || echo '$')"
+}
+
+__eat_preexec () {
+  # Get the real command typed by the user from the history.
+  __eat_current_command="$(history 1 | sed 's/ *[0-9]* *//')"
+  # Send current command.
+  printf '\e]51;e;F;%s\e\\' \
+         "$(printf "%s" "$__eat_current_command" | base64)"
+  # Send pre-exec sequence.
+  printf '\e]51;e;G\e\\'
+  # Update title to include the command running.
+  # "${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 %s\e\\' "$USER" "$HOSTNAME" \
+         "${PWD/$HOME/'~'}" \
+         "$(test $UID -eq 0 && echo '#' || echo '$')" \
+         "$__eat_current_command"
+}
+
+__eat_before_prompt_command ()
+{
+  __eat_exit_status="$?"
+  __eat_inhibit_preexec=yes
+}
+
+__eat_after_prompt_command ()
+{
+  __eat_inhibit_preexec=no
+}
+
+__eat_before_exec () {
+  if test $__eat_inhibit_preexec = no \
+      && test "$BASH_COMMAND" != __eat_before_prompt_command
+  then
+    __eat_inhibit_preexec=yes
+    __eat_preexec
+  fi
+}
+
+__eat_enable_integration ()
+{
+  __eat_integration_enabled=yes
+  __eat_current_command=""
+  __eat_exit_status=0
+  __eat_inhibit_preexec=yes
+  local __eat_prompt_start='\e]51;e;B\e\\'
+  local __eat_prompt_end='\e]51;e;C\e\\'
+  local __eat_continuation_start='\e]51;e;D\e\\'
+  local __eat_continuation_end='\e]51;e;E\e\\'
+  PS1="\[$__eat_prompt_start\]$PS1\[$__eat_prompt_end\]"
+  PS2="\[$__eat_continuation_start\]$PS2\[$__eat_continuation_end\]"
+  PROMPT_COMMAND+=(__eat_prompt_command)
+  trap '__eat_before_exec' DEBUG
+  # Wrap 'PROMPT_COMMAND' to avoid it getting trapped in 'DEBUG' trap.
+  # Fun fact: Microsoft doesn't still about know this simple trick.
+  # They ended up using something as silly and pityful as
+  # 'VAR=$PROMPT_COMMAND' to copy a Bash array in VSCode Bash
+  # integration script, which simply won't work ever, and then
+  # complain about Bash in the comments!  xD
+  PROMPT_COMMAND+=(__eat_after_prompt_command)
+  PROMPT_COMMAND=(__eat_before_prompt_command "${PROMPT_COMMAND[@]}")
+  # Send the history, for native shell prompt.
+  printf '\e]51;e;I;0;bash;%s;%s\e\\' \
+         "$(printf "%s" "$HOSTNAME" | base64)" \
+         "$(printf "%s" "$HISTFILE" | base64)"
+  local REPLY
+  IFS=$';\e' read -r -s -t 10 -d "\\" -a REPLY
+  if test "${REPLY[4]}" != 0
+  then
+    printf '\e]51;e;I;1;bash;%s\e\\' \
+           "$(tail -n "${REPLY[4]}" "$HISTFILE" | base64)"
+  fi
+}
+
+_eat_msg () {
+  local msg=$'\e]51;e;M'
+  for _ in $(eval "echo {1..$#}")
+  do
+    msg="$msg;$(printf "%s" "$1" | base64)"
+    shift
+  done
+  printf "%s\e\\" "$msg"
+}
+
+# Enable.
+if test -z "$__eat_integration_enabled" && \
+    test "${TERM:0:4}" = "eat-"
+then
+  __eat_enable_integration
+else
+  true
+fi
+
+# Local Variables:
+# mode: sh
+# sh-shell: bash
+# End: