Fixes and cleanups to hgeditor:

- "HG: merge resolve" isn't supported for a long time now.
- detection of unchanged commit message if signing is turned off.
- don't add manifest hash to commit message if not signing.

hgeditor

@@ -1,59 +1,57 b''
 #!/bin/sh
 #
 # This is an example of using HGEDITOR to automate the signing of
 # commits and so on.
 
 # change this to one to turn on GPG support
 SIGN=0
 
 T1=""; T2=""
 cleanup_exit() {
     rm -f "$T1" "$T2"
     exit $1
 }
 
 # If you want to pass your favourite editor some other parameters
 # only for Mercurial, modify this:
 case "${EDITOR:=vi}" in
     emacs)
         EDITOR="$EDITOR -nw"
         ;;
     gvim|vim)
         EDITOR="$EDITOR -f -o"
         ;;
 esac
 
-if grep -q "^HG: merge resolve" "$1" ; then
-    # we don't sign merges
-    exec $EDITOR "$1"
-else
-    # Remove temporary files even if we get interrupted
-    trap "cleanup_exit 255" TERM KILL INT QUIT ABRT
-    T1=`mktemp`; T2=`mktemp`
-    MANIFEST=`grep '^HG: manifest hash' "$1" | cut -b 19-`
+# Remove temporary files even if we get interrupted
+trap "cleanup_exit 255" TERM KILL INT QUIT ABRT
+T1=`mktemp`; T2=`mktemp`
+(
+    cd "`hg root`"
+    grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
+        hg diff "$changed" >> "$T2"
+    done
+)
 
-    echo -e "\n\nmanifest hash: $MANIFEST" >> "$T1"
-    grep -vE '^(HG: manifest hash .*)?$' "$1" >> "$T1"
-    (
-        cd "`hg root`"
-        grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
-            hg diff "$changed" >> "$T2"
-        done
-    )
-
-    CHECKSUM=`md5sum "$T1"`
-    $EDITOR "$T1" "$T2" || cleanup_exit $?
+echo > "$T1"
+if [ "$SIGN" == "1" ]; then
+    MANIFEST=`grep '^HG: manifest hash' "$1" | cut -b 19-`
+    echo -e "\nmanifest hash: $MANIFEST" >> "$T1"
+fi
+grep -vE '^(HG: manifest hash .*)?$' "$1" >> "$T1"
 
-    if [ "$SIGN" == "1" ] ; then
-	echo "$CHECKSUM" | md5sum -c 2>/dev/null && cleanup_exit 13
-	{
-	    head -n 1 "$T1"
-	    echo
-	    grep -v "^HG:" "$T1" | gpg -t -a -u "${HGUSER}" --clearsign
-	} > "$T2" && mv "$T2" "$1"
-    else
-	mv "$T1" "$1"
-    fi
-    cleanup_exit $?
+CHECKSUM=`md5sum "$T1"`
+$EDITOR "$T1" "$T2" || cleanup_exit $?
+echo "$CHECKSUM" | md5sum -c 2>/dev/null && cleanup_exit 13
+
+if [ "$SIGN" == "1" ]; then
+    {
+        head -n 1 "$T1"
+        echo
+        grep -v "^HG:" "$T1" | gpg -t -a -u "${HGUSER}" --clearsign
+    } > "$T2" && mv "$T2" "$1"
+else
+    mv "$T1" "$1"
 fi
 
+cleanup_exit $?