Basic "subtree merge --squash" support.

Instead of merging in the history of the entire subproject, just squash it
all into one commit, but try to at least track which commits we used so that
we can do future merges correctly.

Bonus feature: we can actually switch branches of the subproject this way,
just by "squash merging" back and forth from one tag to another.

git-subtree.sh

@@ -167,15 +167,46 @@ try_remove_previous()
 	fi
 }
 
+find_latest_squash()
+{
+	debug "Looking for latest squash..."
+	dir="$1"
+	git log --grep="^git-subtree-dir: $dir\$" \
+		--pretty=format:'START %H%n%s%n%n%b%nEND%n' HEAD |
+	while read a b junk; do
+		case "$a" in
+			START) sq="$b" ;;
+			git-subtree-mainline:) main="$b" ;;
+			git-subtree-split:) sub="$b" ;;
+			END)
+				if [ -n "$sub" ]; then
+					if [ -n "$main" ]; then
+						# a rejoin commit?
+						# Pretend its sub was a squash.
+						sq="$sub"
+					fi
+					debug "Squash found: $sq $sub"
+					echo "$sq" "$sub"
+					break
+				fi
+				sq=
+				main=
+				sub=
+				;;
+		esac
+	done
+}
+
 find_existing_splits()
 {
 	debug "Looking for prior splits..."
 	dir="$1"
 	revs="$2"
 	git log --grep="^git-subtree-dir: $dir\$" \
-		--pretty=format:'%s%n%n%b%nEND' $revs |
+		--pretty=format:'%s%n%n%b%nEND%n' $revs |
 	while read a b junk; do
 		case "$a" in
+			START) main="$b" ;;
 			git-subtree-mainline:) main="$b" ;;
 			git-subtree-split:) sub="$b" ;;
 			END)
@@ -244,6 +275,28 @@ rejoin_msg()
 	EOF
 }
 
+squash_msg()
+{
+	dir="$1"
+	oldsub="$2"
+	newsub="$3"
+	oldsub_short=$(git rev-parse --short "$oldsub")
+	newsub_short=$(git rev-parse --short "$newsub")
+	cat <<-EOF
+		Squashed '$dir/' changes from $oldsub_short..$newsub_short
+	
+	EOF
+	
+	git log --pretty=tformat:'%h %s' "$oldsub..$newsub"
+	git log --pretty=tformat:'REVERT: %h %s' "$newsub..$oldsub"
+	
+	cat <<-EOF
+		
+		git-subtree-dir: $dir
+		git-subtree-split: $newsub
+	EOF
+}
+
 toptree_for_commit()
 {
 	commit="$1"
@@ -278,6 +331,16 @@ tree_changed()
 	fi
 }
 
+new_squash_commit()
+{
+	old="$1"
+	oldsub="$2"
+	newsub="$3"
+	tree=$(toptree_for_commit $newsub) || exit $?
+	squash_msg "$dir" "$oldsub" "$newsub" | 
+		git commit-tree "$tree" -p "$old" || exit $?
+}
+
 copy_or_skip()
 {
 	rev="$1"
@@ -452,6 +515,19 @@ cmd_merge()
 	fi
 	rev="$1"
 	
+	if [ -n "$squash" ]; then
+		first_split="$(find_latest_squash "$dir")"
+		if [ -z "$first_split" ]; then
+			die "Can't squash-merge: '$dir' was never added."
+		fi
+		set $first_split
+		old=$1
+		sub=$2
+		new=$(new_squash_commit "$old" "$sub" "$rev") || exit $?
+		debug "New squash commit: $new"
+		rev="$new"
+	fi
+	
 	git merge -s subtree $rev
 }