[PATCH] cli: add a tool for starting new message in the emacs ui

[Jani Nikula]

Add a tool to start composing an email in the Notmuch Emacs UI with
the specified subject, recipients, and message body.

---

I need something like this to script some mails, particularly with the
mutt compatible options, but I also think notmuch must have long
options. I then got a little carried away with figuring out how to
support both. I think it turned out pretty neat, except due to some
subtlety it only works with bash.

I didn't integrate this in the man build or install or anything,
because I wanted to get feedback first on whether we want to have this
at all. Or if it should live in contrib or something.

BR,
Jani.
---
 doc/man1/notmuch-emacs-mua.rst |  50 ++++++++++++++++++
 notmuch-emacs-mua              | 113 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 163 insertions(+)
 create mode 100644 doc/man1/notmuch-emacs-mua.rst
 create mode 100755 notmuch-emacs-mua

diff --git a/doc/man1/notmuch-emacs-mua.rst b/doc/man1/notmuch-emacs-mua.rst
new file mode 100644
index 000000000000..6e63818492fb
--- /dev/null
+++ b/doc/man1/notmuch-emacs-mua.rst
@@ -0,0 +1,50 @@
+=================
+notmuch-emacs-mua
+=================
+
+SYNOPSIS
+========
+
+**notmuch-emacs-mua** [options ...] [<to-address> ...]
+
+DESCRIPTION
+===========
+
+Start composing an email in the Notmuch Emacs UI with the specified
+subject, recipients, and message body.
+
+For **notmuch-emacs-mua** to work, you need **emacsclient** and an
+already running Emacs with a server.
+
+Supported options for **notmuch-emacs-mua** include
+
+    ``-h, --help``
+        Display help.
+
+    ``-s, --subject=``\ <subject>
+        Specify the subject of the message.
+
+    ``--to=``\ <to-address>
+        Specify a recipient (To).
+
+    ``-c, --cc=``\ <cc-address>
+        Specify a carbon-copy (Cc) recipient.
+
+    ``-b, --bcc=``\ <bcc-address>
+        Specify a blind-carbon-copy (Bcc) recipient.
+
+    ``-i, --body=``\ <file>
+        Specify a file to include into the body of the message.
+
+    ``--print``
+        Output the resulting elisp to stdout instead of evaluating it.
+
+The supported positional parameters and short options are a compatible
+subset of the **mutt** MUA command-line options.
+
+Options may be specified multiple times.
+
+SEE ALSO
+========
+
+**notmuch(1)**, **emacsclient(1)**, **mutt(1)**
diff --git a/notmuch-emacs-mua b/notmuch-emacs-mua
new file mode 100755
index 000000000000..a482fe1a8eca
--- /dev/null
+++ b/notmuch-emacs-mua
@@ -0,0 +1,113 @@
+#!/bin/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 http://www.gnu.org/licenses/ .
+#
+# Authors: Jani Nikula <jani at nikula.org>
+#
+
+set -e
+
+# The crux of it all: construct an elisp progn and eval it.
+ELISP="(progn (notmuch-mua-new-mail)"
+
+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)
+		    ;;
+		*)
+		    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
+
+    case "${opt}" in
+	--help|h)
+	    exec man notmuch-search
+	    ;;
+	--subject|s)
+	    ELISP="${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) (cd \"${PWD}\") (insert-file \"${OPTARG}\")"
+	    ;;
+	--print)
+	    PRINT_ONLY=1
+	    ;;
+	*)
+	    # We should never end up here.
+	    echo "$0: internal error (option ${opt})." >&2
+	    exit 1
+	    ;;
+    esac
+
+    shift $((OPTIND - 1))
+    OPTIND=1
+done
+
+# Positional parameters.
+while [ $# -gt 0 ]; do
+    ELISP="${ELISP} (message-goto-to) (insert \"${1}, \")"
+    shift
+done
+
+# End progn.
+ELISP="${ELISP})"
+
+if [ -n "$PRINT_ONLY" ]; then
+    echo ${ELISP}
+    exit 0
+fi
+
+# Evaluate the progn.
+emacsclient --eval "${ELISP}" &>/dev/null
+if [ $? -ne 0 ]; then
+    echo "$0: emacsclient failed" >&2
+    exit 1
+fi
-- 
1.9.0