add more flexible header manipulation

diff --git a/.mutt/append-header b/.mutt/append-header
new file mode 120000 (symlink)
index 0000000..5cc745f
--- /dev/null
+++ b/.mutt/append-header
@@ -0,0 +1 @@
+edit-header
\ No newline at end of file

diff --git a/.mutt/edit-header b/.mutt/edit-header
new file mode 100755 (executable)
index 0000000..3a3a96a
--- /dev/null
+++ b/.mutt/edit-header
@@ -0,0 +1,67 @@
+#!/bin/sh
+#
+# edit-header - helper script to append/replace/remove headers with mutt
+#
+# Based on an idea by David Champion <dgc at uchicago.edu>
+#
+# Copyright © 2008 martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+set -euvx
+
+if [ ! -x "$(command -v formail)" ]; then
+  echo E: formail not installed. >&2
+  exit 1
+fi
+
+header="${1:-}"
+if [ -z "$header" ]; then
+  echo "E: no header specified" >&2
+  exit 1
+fi
+
+get_header_contents()
+{
+  local contents
+  printf "Enter ${1:-header} contents: " >/dev/tty
+  read contents </dev/tty
+  echo "$contents"
+}
+
+script="${0%/*}/${2:-}"
+if [ -f "$script" ] && [ -x "$script" ]; then
+  contents_source="$script"
+  shift
+else
+  contents_source=get_header_contents
+fi
+
+editor=
+case "$0" in
+  *append-header|*supersede-header|*replace-header)
+    contents="${2:-}"
+    [ -n "$contents" ] || contents="$(eval $contents_source $header)"
+    case "$0" in
+      *append-header) flag=-A;;
+      *supersede-header) flag=-i;;
+      *replace-header) flag=-I;;
+    esac
+    editor="${0%/*}/filter-proxy formail $flag \'$header: $contents\'"
+    ;;
+
+  *remove-header)
+    editor="${0%/*}/filter-proxy formail -I \'$header:\'"
+    ;;
+
+  *)
+    echo "E: unknown invocation: ${0##*/}" >&2
+    exit 1
+    ;;
+
+esac
+
+echo "set my_editor=\"\$editor\'"
+echo "set editor=\"$editor\""
+echo "push <tag-prefix><edit>"
+# we need to push this so it happens after the editing
+echo "push :set editor=\"\$my_editor\"<enter>"

diff --git a/.mutt/filter-proxy b/.mutt/filter-proxy
new file mode 100755 (executable)
index 0000000..bd54b44
--- /dev/null
+++ b/.mutt/filter-proxy
@@ -0,0 +1,31 @@
+#!/bin/sh
+#
+# filter-proxy - enable filters to work on real files (using tmpfiles)
+#
+# Copyright © 2008 martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+set -euvx
+
+cmd=
+file=
+while [ -n "${1:-}" ]; do
+  if [ -z "${2:-}" ]; then
+    file="$1"
+  else
+    case "$1" in
+      *' '*) cmd="$cmd '$1'";;
+      *) cmd="$cmd $1";;
+    esac
+  fi
+  shift
+done
+
+TMPFILE="$(tempfile -p proxy)"
+trap "rm -f $TMPFILE" 0 1 2 3 4 5 6 7 8 10 11 12 13 14 15
+
+eval $cmd <"$file" >$TMPFILE
+cat $TMPFILE >"$file"
+
+rm -f $TMPFILE
+trap - 0 1 2 3 4 5 6 7 8 10 11 12 13 14 15

diff --git a/.mutt/get-timestamp b/.mutt/get-timestamp
new file mode 100755 (executable)
index 0000000..4a1c524
--- /dev/null
+++ b/.mutt/get-timestamp
@@ -0,0 +1,28 @@
+#!/bin/sh
+#
+# get-timestamp - helper script to obtain a timestamp from the user
+#
+# Copyright © 2008 martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+set -eu
+
+printf 'When should I tickle you about this message? ' >/dev/tty
+read timespec </dev/tty
+
+case "$timespec" in
+  @[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]|*' '*)
+    date="$timespec";;
+  *[0-9]y) date="now + ${timespec%y} years 00:00";;
+  *[0-9]m) date="now + ${timespec%m} months 00:00";;
+  *[0-9]w) date="now + ${timespec%w} weeks 00:00";;
+  *[0-9]d) date="now + ${timespec%d} days 00:00";;
+  *[0-9]h) date="now + ${timespec%h} hours";;
+  *[!0-9]*) 
+    echo "E: invalid timespec: $timespec" >&2
+    exit 1
+    ;;
+  *) date="now + $timespec days 00:00";;
+esac
+
+exec date +'%s (%c)' -d "$date"

diff --git a/.mutt/remove-header b/.mutt/remove-header
new file mode 120000 (symlink)
index 0000000..5cc745f
--- /dev/null
+++ b/.mutt/remove-header
@@ -0,0 +1 @@
+edit-header
\ No newline at end of file

diff --git a/.mutt/replace-header b/.mutt/replace-header
new file mode 120000 (symlink)
index 0000000..5cc745f
--- /dev/null
+++ b/.mutt/replace-header
@@ -0,0 +1 @@
+edit-header
\ No newline at end of file

diff --git a/.mutt/supersede-header b/.mutt/supersede-header
new file mode 120000 (symlink)
index 0000000..5cc745f
--- /dev/null
+++ b/.mutt/supersede-header
@@ -0,0 +1 @@
+edit-header
\ No newline at end of file