X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topgit.git;a=blobdiff_plain;f=tg.sh;h=b848f7863ae6f482dd7d37d4df9ebd07e91dc509;hp=56c5709f1d8f319e7d356d1b0fe9f0880cf98fed;hb=8d92943bcdb6eea3819dce28d2ff48dd8a061b31;hpb=749b6480eb88ab6703a8143e24e853777b82dca1

diff --git a/tg.sh b/tg.sh
index 56c5709..b848f78 100644
--- a/tg.sh
+++ b/tg.sh
@@ -3,6 +3,7 @@
 # (c) Petr Baudis <pasky@suse.cz>  2008
 # GPLv2
 
+TG_VERSION=0.8
 
 ## Auxiliary functions
 
@@ -17,25 +18,49 @@ die()
 	exit 1
 }
 
+# cat_file "topic:file"
+# Like `git cat-file blob $1`, but topics '(i)' and '(w)' means index and worktree
+cat_file()
+{
+	arg="$1"
+	case "$arg" in
+	'(w):'*)
+		arg=$(echo "$arg" | tail --bytes=+5)
+		cat "$arg"
+		return
+		;;
+	'(i):'*)
+		# ':file' means cat from index
+		arg=$(echo "$arg" | tail --bytes=+5)
+		git cat-file blob ":$arg"
+		;;
+	*)
+		git cat-file blob "$arg"
+	esac
+}
+
 # setup_hook NAME
 setup_hook()
 {
-	hook_call="\"\$(tg --hooks-path)\"/$1 \"\$@\""
-	if fgrep -q "$hook_call" "$git_dir/hooks/$1"; then
+	hook_call="\"\$($tg --hooks-path)\"/$1 \"\$@\""
+	if [ -f "$git_dir/hooks/$1" ] &&
+	   fgrep -q "$hook_call" "$git_dir/hooks/$1"; then
 		# Another job well done!
 		return
 	fi
-	# Prepare incanation
+	# Prepare incantation
 	if [ -x "$git_dir/hooks/$1" ]; then
 		hook_call="$hook_call"' || exit $?'
 	else
 		hook_call="exec $hook_call"
 	fi
+	# Don't call hook if tg is not installed
+	hook_call="if which \"$tg\" > /dev/null; then $hook_call; fi"
 	# Insert call into the hook
 	{
 		echo "#!/bin/sh"
 		echo "$hook_call"
-		cat "$git_dir/hooks/$1"
+		[ ! -s "$git_dir/hooks/$1" ] || cat "$git_dir/hooks/$1"
 	} >"$git_dir/hooks/$1+"
 	chmod a+x "$git_dir/hooks/$1+"
 	mv "$git_dir/hooks/$1+" "$git_dir/hooks/$1"
@@ -44,11 +69,11 @@ setup_hook()
 # setup_ours (no arguments)
 setup_ours()
 {
-	if [ ! -s "$git_dir/info/gitattributes" ] || ! grep -q topmsg "$git_dir/info/gitattributes"; then
+	if [ ! -s "$git_dir/info/attributes" ] || ! grep -q topmsg "$git_dir/info/attributes"; then
 		{
-			echo -e ".topmsg\tmerge=ours"
-			echo -e ".topdeps\tmerge=ours"
-		} >>"$git_dir/info/gitattributes"
+			echo ".topmsg	merge=ours"
+			echo ".topdeps	merge=ours"
+		} >>"$git_dir/info/attributes"
 	fi
 	if ! git config merge.ours.driver >/dev/null; then
 		git config merge.ours.name '"always keep ours" merge driver'
@@ -59,11 +84,11 @@ setup_ours()
 # measure_branch NAME [BASE]
 measure_branch()
 {
-	_name="$1"; _base="$2"
-	[ -n "$_base" ] || _base="refs/top-bases/$_name"
+	_bname="$1"; _base="$2"
+	[ -n "$_base" ] || _base="refs/top-bases/$_bname"
 	# The caller should've verified $name is valid
-	_commits="$(git rev-list "$_name" ^"$_base" | wc -l)"
-	_nmcommits="$(git rev-list --no-merges "$_name" ^"$_base" | wc -l)"
+	_commits="$(git rev-list "$_bname" ^"$_base" -- | wc -l)"
+	_nmcommits="$(git rev-list --no-merges "$_bname" ^"$_base" -- | wc -l)"
 	if [ $_commits -gt 1 ]; then
 		_suffix="commits"
 	else
@@ -76,46 +101,163 @@ measure_branch()
 # Whether B1 is a superset of B2.
 branch_contains()
 {
-	[ -z "$(git rev-list ^"$1" "$2")" ]
+	[ -z "$(git rev-list --max-count=1 ^"$1" "$2" --)" ]
+}
+
+# ref_exists REF
+# Whether REF is a valid ref name
+ref_exists()
+{
+	git rev-parse --verify "$@" >/dev/null 2>&1
+}
+
+# has_remote BRANCH
+# Whether BRANCH has a remote equivalent (accepts top-bases/ too)
+has_remote()
+{
+	[ -n "$base_remote" ] && ref_exists "remotes/$base_remote/$1"
 }
 
-# needs_update NAME [BRANCHPATH...]
+branch_annihilated()
+{
+	_name="$1";
+
+	# use the merge base in case the base is ahead.
+	mb="$(git merge-base "refs/top-bases/$_name" "$_name")";
+
+	test "$(git rev-parse "$mb^{tree}")" = "$(git rev-parse "$_name^{tree}")";
+}
+
+# is_sha1 REF
+# Whether REF is a SHA1 (compared to a symbolic name).
+is_sha1()
+{
+	[ "$(git rev-parse "$1")" = "$1" ]
+}
+
+# recurse_deps CMD NAME [BRANCHPATH...]
+# Recursively eval CMD on all dependencies of NAME.
+# CMD can refer to $_name for queried branch name,
+# $_dep for dependency name,
+# $_depchain for space-seperated branch backtrace,
+# and the $_dep_is_tgish boolean.
+# It can modify $_ret to affect the return value
+# of the whole function.
+# If recurse_deps() hits missing dependencies, it will append
+# them to space-separated $missing_deps list and skip them.
+# remote dependencies are processed if no_remotes is unset.
+recurse_deps()
+{
+	_cmd="$1"; shift
+	_name="$1"; # no shift
+	_depchain="$*"
+
+	_depsfile="$(mktemp -t tg-depsfile.XXXXXX)"
+	# If no_remotes is unset check also our base against remote base.
+	# Checking our head against remote head has to be done in the helper.
+	if test -z "$no_remotes" && has_remote "top-bases/$_name"; then
+		echo "refs/remotes/$base_remote/top-bases/$_name" >>"$_depsfile"
+	fi
+
+	# if the branch was annihilated, there exists no .topdeps file
+	if ! branch_annihilated "$_name"; then
+		#TODO: handle nonexisting .topdeps?
+		git cat-file blob "$_name:.topdeps" >>"$_depsfile";
+	fi;
+
+	_ret=0
+	while read _dep; do
+		if ! ref_exists "$_dep" ; then
+			# All hope is lost
+			missing_deps="$missing_deps $_dep"
+			continue
+		fi
+
+		_dep_is_tgish=1
+		ref_exists "refs/top-bases/$_dep"  ||
+			_dep_is_tgish=
+
+		# Shoo shoo, keep our environment alone!
+		[ -z "$_dep_is_tgish" ] ||
+			(recurse_deps "$_cmd" "$_dep" "$@") ||
+			_ret=$?
+
+		eval "$_cmd"
+	done <"$_depsfile"
+	missing_deps="${missing_deps# }"
+	rm "$_depsfile"
+	return $_ret
+}
+
+# branch_needs_update
+# This is a helper function for determining whether given branch
+# is up-to-date wrt. its dependencies. It expects input as if it
+# is called as a recurse_deps() helper.
+# In case the branch does need update, it will echo it together
+# with the branch backtrace on the output (see needs_update()
+# description for details) and set $_ret to non-zero.
+branch_needs_update()
+{
+	_dep_base_update=
+	if [ -n "$_dep_is_tgish" ]; then
+		if has_remote "$_dep"; then
+			branch_contains "$_dep" "refs/remotes/$base_remote/$_dep" || _dep_base_update=%
+		fi
+		# This can possibly override the remote check result;
+		# we want to sync with our base first
+		branch_contains "$_dep" "refs/top-bases/$_dep" || _dep_base_update=:
+	fi
+
+	if [ -n "$_dep_base_update" ]; then
+		# _dep needs to be synced with its base/remote
+		echo "$_dep_base_update $_dep $_depchain"
+		_ret=1
+	elif [ -n "$_name" ] && ! branch_contains "refs/top-bases/$_name" "$_dep"; then
+		# Some new commits in _dep
+		echo "$_dep $_depchain"
+		_ret=1
+	fi
+}
+
+# needs_update NAME
 # This function is recursive; it outputs reverse path from NAME
 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
 # inner paths first. Innermost name can be ':' if the head is
-# not in sync with the base.
+# not in sync with the base or '%' if the head is not in sync
+# with the remote (in this order of priority).
+# It will also return non-zero status if NAME needs update.
+# If needs_update() hits missing dependencies, it will append
+# them to space-separated $missing_deps list and skip them.
 needs_update()
 {
-	{
-	git cat-file blob "$1:.topdeps" 2>/dev/null |
-		while read _dep; do
-			_dep_is_tgish=1
-			git rev-parse --verify "refs/top-bases/$_dep" >/dev/null 2>&1 ||
-				_dep_is_tgish=
-
-			# Shoo shoo, keep our environment alone!
-			[ -z "$_dep_is_tgish" ] || (needs_update "$_dep" "$@")
-
-			_dep_base_uptodate=1
-			if [ -n "$_dep_is_tgish" ]; then
-				branch_contains "$_dep" "refs/top-bases/$_dep" || _dep_base_uptodate=
-			fi
-
-			if [ -z "$_dep_base_uptodate" ]; then
-				# _dep needs to be synced with its base
-				echo ": $_dep $*"
-			elif ! branch_contains "refs/top-bases/$1" "$_dep"; then
-				# Some new commits in _dep
-				echo "$_dep $*"
-			fi
-		done
-	} || : # $1 is not tracked by TopGit anymore
+	recurse_deps branch_needs_update "$@"
 }
 
 # branch_empty NAME
 branch_empty()
 {
-	[ -z "$(git diff-tree "refs/top-bases/$1" "$1" | fgrep -v "	.top")" ]
+	[ -z "$(git diff-tree "refs/top-bases/$1" "$1" -- | fgrep -v "	.top")" ]
+}
+
+# list_deps
+list_deps()
+{
+	git for-each-ref refs/top-bases |
+		while read rev type ref; do
+			name="${ref#refs/top-bases/}"
+			if branch_annihilated "$name"; then
+				continue;
+			fi
+
+			git cat-file blob "$name:.topdeps" | while read dep; do
+				dep_is_tgish=true
+				ref_exists "refs/top-bases/$dep"  ||
+					dep_is_tgish=false
+				if ! "$dep_is_tgish" || ! branch_annihilated $dep; then
+					echo "$name $dep"
+				fi
+			done
+		done
 }
 
 # switch_to_base NAME [SEED]
@@ -131,38 +273,140 @@ switch_to_base()
 	git symbolic-ref HEAD "$_base"
 }
 
+# Show the help messages.
+do_help()
+{
+	if [ -z "$1" ] ; then
+		# This is currently invoked in all kinds of circumstances,
+		# including when the user made a usage error. Should we end up
+		# providing more than a short help message, then we should
+		# differentiate.
+		# Petr's comment: http://marc.info/?l=git&m=122718711327376&w=2
+
+		## Build available commands list for help output
+
+		cmds=
+		sep=
+		for cmd in "@cmddir@"/tg-*; do
+			! [ -r "$cmd" ] && continue
+			# strip directory part and "tg-" prefix
+			cmd="$(basename "$cmd")"
+			cmd="${cmd#tg-}"
+			cmds="$cmds$sep$cmd"
+			sep="|"
+		done
+
+		echo "TopGit v$TG_VERSION - A different patch queue manager"
+		echo "Usage: tg [-r REMOTE] ($cmds|help) ..."
+	elif [ -r "@cmddir@"/tg-$1 ] ; then
+		setup_pager
+		@cmddir@/tg-$1 -h 2>&1 || :
+		echo
+		if [ -r "@sharedir@/tg-$1.txt" ] ; then
+			cat "@sharedir@/tg-$1.txt"
+		fi
+	else
+		echo "`basename $0`: no help for $1" 1>&2
+		do_help
+		exit 1
+	fi
+}
+
+## Pager stuff
+
+# isatty FD
+isatty()
+{
+	test -t $1
+}
+
+# setup_pager
+# Spawn pager process and redirect the rest of our output to it
+setup_pager()
+{
+	isatty 1 || return 0
+
+	# TG_PAGER = GIT_PAGER | PAGER | less
+	# NOTE: GIT_PAGER='' is significant
+	TG_PAGER=${GIT_PAGER-${PAGER-less}}
+
+	[ -z "$TG_PAGER"  -o  "$TG_PAGER" = "cat" ]  && return 0
+
+
+	# now spawn pager
+	export LESS="${LESS:-FRSX}"	# as in pager.c:pager_preexec()
+
+	_pager_fifo_dir="$(mktemp -t -d tg-pager-fifo.XXXXXX)"
+	_pager_fifo="$_pager_fifo_dir/0"
+	mkfifo -m 600 "$_pager_fifo"
+
+	"$TG_PAGER" < "$_pager_fifo" &
+	exec > "$_pager_fifo"		# dup2(pager_fifo.in, 1)
+
+	# this is needed so e.g. `git diff` will still colorize it's output if
+	# requested in ~/.gitconfig with color.diff=auto
+	export GIT_PAGER_IN_USE=1
+
+	# atexit(close(1); wait pager)
+	trap "exec >&-; rm \"$_pager_fifo\"; rmdir \"$_pager_fifo_dir\"; wait" EXIT
+}
+
+## Startup
+
+[ -d "@cmddir@" ] ||
+	die "No command directory: '@cmddir@'"
 
 ## Initial setup
 
 set -e
 git_dir="$(git rev-parse --git-dir)"
 root_dir="$(git rev-parse --show-cdup)"; root_dir="${root_dir:-.}"
+# Make sure root_dir doesn't end with a trailing slash.
+root_dir="${root_dir%/}"
+base_remote="$(git config topgit.remote 2>/dev/null)" || :
+tg="tg"
 # make sure merging the .top* files will always behave sanely
 setup_ours
 setup_hook "pre-commit"
 
-
 ## Dispatch
 
 # We were sourced from another script for our utility functions;
-# this is set by hooks.
-[ -z "$tg__include" ] || return 0
+# this is set by hooks.  Skip the rest of the file.  A simple return doesn't
+# work as expected in every shell.  See http://bugs.debian.org/516188
+if [ -z "$tg__include" ]; then
+
+if [ "$1" = "-r" ]; then
+	shift
+	if [ -z "$1" ]; then
+		echo "Option -r requires an argument." >&2
+		do_help
+		exit 1
+	fi
+	base_remote="$1"; shift
+	tg="$tg -r $base_remote"
+fi
 
 cmd="$1"
-[ -n "$cmd" ] || die "He took a duck in the face at two hundred and fifty knots"
+[ -n "$cmd" ] || { do_help; exit 1; }
 shift
 
 case "$cmd" in
-help)
-	echo "TopGit - A different patch queue manager"
-	echo "Usage: tg (create|delete|info|patch|summary|update|help) ..."
-	exit 1;;
-create|delete|info|patch|summary|update)
-	. "@cmddir@"/tg-$cmd;;
+help|--help|-h)
+	do_help "$1"
+	exit 0;;
 --hooks-path)
 	# Internal command
 	echo "@hooksdir@";;
 *)
-	echo "Unknown subcommand: $cmd" >&2
-	exit 1;;
+	[ -r "@cmddir@"/tg-$cmd ] || {
+		echo "Unknown subcommand: $cmd" >&2
+		do_help
+		exit 1
+	}
+	. "@cmddir@"/tg-$cmd;;
 esac
+
+fi
+
+# vim:noet