From 4c29f1a4a06948e003145dfdcd7638c240001a26 Mon Sep 17 00:00:00 2001
From: Rob Pearce <rob@nethack.net>
Date: Fri, 17 Jun 2022 10:12:13 +1000
Subject: [PATCH] Added 'gen' command to renumber all task IDs

---
 t.sh | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 64 insertions(+), 2 deletions(-)

diff --git a/t.sh b/t.sh
index 304e11d..fc78a5c 100755
--- a/t.sh
+++ b/t.sh
@@ -18,7 +18,7 @@ if [[ -z $HAVE_BASHTOOLS ]]; then
 fi
 
 INFORMCOL="$GREEN"
-INFORMCOLB="$GREENBOLD"
+INFORMCOLB="$GREEN$BOLD"
 
 brack="$CYAN"
 brackfold="$CYAN"
@@ -1705,6 +1705,7 @@ vdirsyncconfig="${vdirsyncdir}/config"
 printed=0
 rows=$(tput lines)
 
+
 addcmd "list" "list [id1] .. [idX]" "List [just the specified] tasks" "list|ls|show" SUPPORTS_ALL PASSIVE
 addcmd "fold" "fold <id>" "Fold a parent task (hide its children)" "fold|f|zc" SUPPORTS_ALL
 addcmd "unfold" "unfold <id>" "Unfold a parent task (show its children)" "unfold|u|zo" SUPPORTS_ALL
@@ -1728,6 +1729,7 @@ addcmd "push" "push" "Push all tasks to server" "push"
 addcmd "view" "view <id>" "Show detailed info for given task" "v|view|info|vcal" PASSIVE
 addcmd "showcals" "showcals" "List available calendars" "cals|showcals|cls" PASSIVE
 addcmd "setcal" "setcal" "Set the default calendar." "setcal|sc"
+addcmd "renumber" "renumber" "Re-generate IDs for all tasks with lowest possible numbers" "rn|gen"
 
 [[ ! -e $cachedir ]] && mkdir -p "$cachedir"
 
@@ -1848,6 +1850,67 @@ if [[ $mode == "sync" ]]; then
 elif [[ $mode == "push" ]]; then
     tasksync push
     exit $rv
+elif [[ $mode == "renumber" ]]; then
+    idfilebackup="$idfile.bak.$(date +%Y%m%d%H%M%S)"
+    idfilenew=$(mktemp /tmp/newid.XXXXXXXX)
+
+    # figure out what summing program to use
+    sumprog=""
+    for x in md5 md5sum; do
+        which $x >/dev/null 2>&1
+        if [[ $? -eq 0 ]]; then
+            sumprog="$x"
+            break
+        fi
+    done
+    if [[ -n $sumprog ]]; then
+        notify "Checking current task IDs"
+        cat "$idfile" | awk 'BEGIN { id=1; FS=":"; } /.*:.*/{ print $1 ":" id++; } ' > "$idfilenew"
+        md5old=$($sumprog "$idfile")
+        md5new=$($sumprog "$idfilenew")
+        if [[ $sumprog == "md5" ]]; then
+            md5old=$(echo "$md5old" | awk '{ print $NF }')
+            md5new=$(echo "$md5new" | awk '{ print $NF }')
+        else
+            md5old=$(echo "$md5old" | awk '{ print $1 }')
+            md5new=$(echo "$md5new" | awk '{ print $1 }')
+        fi
+        ok
+        if [[ $md5old == $md5new ]]; then
+            inform "No changes required based on checksums."
+echo "old:  $md5sumold"
+echo "new:  $md5sumnew"
+            exit 0
+        fi
+    else
+        warn "No checksumming program found - install md5 or md5sum."
+    fi
+    oldmin=$(cat "$idfile" | cut -d: -f2 | sort -nr | tail -1)
+    oldmax=$(cat "$idfile" | cut -d: -f2 | sort -n | tail -1)
+    min=$(cat "$idfilenew" | cut -d: -f2 | sort -nr | tail -1)
+    max=$(cat "$idfilenew" | cut -d: -f2 | sort -n | tail -1)
+    if [[ $oldmin -eq $min && $newmin -eq $min ]]; then
+        inform "No changes required based on task IDs."
+        exit 0
+    fi
+    inform "This process will renumber all tasks:"
+    inform "       Current ID range:   ^b$oldmin^p-^b$oldmax^p"
+    inform "           New ID range:   ^b$min^p-^b$max^p"
+    confirm "Really proceed"
+    if [[ $? -ne 0 ]]; then
+        inform "Aborted."
+        exit 1
+    fi
+
+    notify "Backing up mapping file to ^b$idfilebackup^p"
+    cp -a "$idfile" "$idfilebackup"
+    [[ $? -eq 0 ]] && ok || { fail; exit 1; }
+    notify "Re-generating task IDs"
+    mv -f "$idfilenew" "$idfile"
+    [[ $? -eq 0 ]] && ok || { fail; exit 1; }
+
+    inform "Task ID renumbering complete."
+    exit 0
 fi
 
 notify "Processing"
@@ -1855,7 +1918,6 @@ loadids || exit 1
 loadtasks || exit 1
 ok
 
-
 if [[ $MAINTMODE -eq 1 ]]; then
     # check for id mappings with missing tasks
     notify "Checking ID mappings"