From bb828ac13f9010318047cf0ee427a8f1c4e51897 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Wed, 20 May 2020 18:12:36 +0200
Subject: initial commit

---
 reorder-maildir | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100755 reorder-maildir

diff --git a/reorder-maildir b/reorder-maildir
new file mode 100755
index 0000000..d0801f8
--- /dev/null
+++ b/reorder-maildir
@@ -0,0 +1,57 @@
+#!/bin/bash
+
+if [ $# -ne 1 ] || [ -n "${1##*/courierimapuiddb}" ]; then
+  >&2 printf 'usage: %s dir/courierimapuiddb' "$0"
+  exit 1
+fi
+
+dir="${1%/courierimapuiddb}"
+
+>&2 printf 'reordering %s ...\n' "$dir"
+
+cd "${dir}/cur"
+
+tmp_dir=$(mktemp -d)
+trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT
+
+while read -r n i; do
+  is_ok=true
+  if f=$(ls "${i}"*) \
+  && d=$(
+    sed -n '
+      /^$/q
+      s/^[Dd]ate: //
+      T
+      p
+    ' "$f" \
+    |head -n1
+  ) \
+  && [ -n "$d" ] \
+  && d=$(date +%s -d"$d"); then
+    printf '%s %s\n' "$d" "$i" \
+    >>"${tmp_dir}/to-sort"
+  else
+    printf '%s %s\n' "${i%%.*}" "$i"
+  fi
+done \
+< <(sed 1d ../courierimapuiddb)
+
+{
+  sed -n 1p ../courierimapuiddb
+  sort -k1n,1 "${tmp_dir}/to-sort" \
+  |cat -n \
+  |sed '
+    s/^\s*\(\S\+\)\s\+\S\+\s\+\(\S.*\)$/\1 \2/
+  '
+} \
+>"${tmp_dir}/sorted"
+
+if diff -u --color <(
+  sed 's/^\S\+ //' ../courierimapuiddb | sort
+) <(
+  sed 's/^\S\+ //' "${tmp_dir}/sorted" | sort
+); then
+  mv "${tmp_dir}/sorted" ../courierimapuiddb
+fi
+
+>&2 printf '... done\n'
-- 
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