+#!/usr/bin/env bash
+#
+# notmuch-emacs-mua - start composing a mail on the command line
+#
+# Copyright © 2014 Jani Nikula
+#
+# This program 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 of the License, 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see https://www.gnu.org/licenses/ .
+#
+# Authors: Jani Nikula <jani@nikula.org>
+#
+
+set -eu
+
+# escape: "expand" '\' as '\\' and '"' as '\"'
+# calling convention: escape -v var "$arg" (like in bash printf).
+escape ()
+{
+ local __escape_arg__=${3//\\/\\\\}
+ printf -v $2 '%s' "${__escape_arg__//\"/\\\"}"
+}
+
+EMACS=${EMACS:-emacs}
+EMACSCLIENT=${EMACSCLIENT:-emacsclient}
+
+PRINT_ONLY=
+NO_WINDOW=
+USE_EMACSCLIENT=
+AUTO_DAEMON=
+CREATE_FRAME=
+ELISP=
+MAILTO=
+
+# Short options compatible with mutt(1).
+while getopts :s:c:b:i:h opt; do
+ # Handle errors and long options.
+ case "${opt}" in
+ :)
+ echo "$0: short option -${OPTARG} requires an argument." >&2
+ exit 1
+ ;;
+ \?)
+ opt=$1
+ if [ "${OPTARG}" != "-" ]; then
+ echo "$0: unknown short option -${OPTARG}." >&2
+ exit 1
+ fi
+
+ case "${opt}" in
+ # Long options with arguments.
+ --subject=*|--to=*|--cc=*|--bcc=*|--body=*)
+ OPTARG=${opt#--*=}
+ opt=${opt%%=*}
+ ;;
+ # Long options without arguments.
+ --help|--print|--no-window-system|--client|--auto-daemon|--create-frame)
+ ;;
+ *)
+ echo "$0: unknown long option ${opt}, or argument mismatch." >&2
+ exit 1
+ ;;
+ esac
+ # getopts does not do this for what it considers errors.
+ OPTIND=$((OPTIND + 1))
+ ;;
+ esac
+
+ escape -v OPTARG "${OPTARG-none}"
+
+ case "${opt}" in
+ --help|h)
+ exec man notmuch-emacs-mua
+ ;;
+ --subject|s)
+ ELISP="${ELISP} (message-goto-subject) (insert \"${OPTARG}\")"
+ ;;
+ --to)
+ ELISP="${ELISP} (message-goto-to) (insert \"${OPTARG}, \")"
+ ;;
+ --cc|c)
+ ELISP="${ELISP} (message-goto-cc) (insert \"${OPTARG}, \")"
+ ;;
+ --bcc|b)
+ ELISP="${ELISP} (message-goto-bcc) (insert \"${OPTARG}, \")"
+ ;;
+ --body|i)
+ ELISP="${ELISP} (message-goto-body) (insert-file \"${OPTARG}\")"
+ ;;
+ --print)
+ PRINT_ONLY=1
+ ;;
+ --no-window-system)
+ NO_WINDOW="-nw"
+ ;;
+ --client)
+ USE_EMACSCLIENT="yes"
+ ;;
+ --auto-daemon)
+ AUTO_DAEMON="--alternate-editor="
+ CREATE_FRAME="-c"
+ ;;
+ --create-frame)
+ CREATE_FRAME="-c"
+ ;;
+ *)
+ # We should never end up here.
+ echo "$0: internal error (option ${opt})." >&2
+ exit 1
+ ;;
+ esac
+
+ shift $((OPTIND - 1))
+ OPTIND=1
+done
+
+# Positional parameters.
+for arg; do
+ escape -v arg "${arg}"
+ case $arg in
+ mailto:*)
+ if [ -n "${MAILTO}" ]; then
+ echo "$0: more than one mailto: argument." >&2
+ exit 1
+ fi
+ MAILTO="${arg}"
+ ;;
+ *)
+ ELISP="${ELISP} (message-goto-to) (insert \"${arg}, \")"
+ ;;
+ esac
+done
+
+if [ -n "${MAILTO}" ]; then
+ if [ -n "${ELISP}" ]; then
+ echo "$0: mailto: is not compatible with other message parameters." >&2
+ exit 1
+ fi
+ ELISP="(browse-url-mail \"${MAILTO}\")"
+else
+ ELISP="(notmuch-mua-new-mail) ${ELISP}"
+fi
+
+# Kill the terminal/frame if we're creating one.
+if [ -z "$USE_EMACSCLIENT" -o -n "$CREATE_FRAME" -o -n "$NO_WINDOW" ]; then
+ ELISP="${ELISP} (message-add-action #'save-buffers-kill-terminal 'exit)"
+fi
+
+escape -v pwd "$PWD"
+
+# The crux of it all: construct an elisp progn and eval it.
+ELISP="(prog1 'done (require 'notmuch) (cd \"$pwd\") ${ELISP})"
+
+if [ -n "$PRINT_ONLY" ]; then
+ echo ${ELISP}
+ exit 0
+fi
+
+if [ -n "$USE_EMACSCLIENT" ]; then
+ # Evaluate the progn.
+ exec ${EMACSCLIENT} ${NO_WINDOW} ${CREATE_FRAME} ${AUTO_DAEMON} --eval "${ELISP}"
+else
+ exec ${EMACS} ${NO_WINDOW} --eval "${ELISP}"
+fi