tg export (collapse): implement skipping empty patches

[topgit.git] / tg-export.sh

diff --git a/tg-export.sh b/tg-export.sh
index 335f698b5ce8d3907f31c08df24fd37bdbd365e7..95aa346ef014af079c40ff8b397d5bee7e1ffa01 100644 (file)
--- a/tg-export.sh
+++ b/tg-export.sh
@@ -4,6 +4,7 @@
 # GPLv2
 
 name=
+branches=
 output=
 driver=collapse
 
@@ -13,12 +14,14 @@ driver=collapse
 while [ -n "$1" ]; do
        arg="$1"; shift
        case "$arg" in
+       -b)
+               branches="$1"; shift;;
        --quilt)
                driver=quilt;;
        --collapse)
                driver=collapse;;
        -*)
-               echo "Usage: tg [...] export ([--collapse] NEWBRANCH | --quilt DIRECTORY)" >&2
+               echo "Usage: tg [...] export ([--collapse] NEWBRANCH | [-b BRANCH1,BRANCH2...] --quilt DIRECTORY)" >&2
                exit 1;;
        *)
                [ -z "$output" ] || die "output already specified ($output)"
@@ -27,9 +30,16 @@ while [ -n "$1" ]; do
 done
 
 
-name="$(git symbolic-ref HEAD | sed 's#^refs/heads/##')"
-base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
-       die "not on a TopGit-controlled branch"
+
+[ -z "$branches" -o "$driver" = "quilt" ] ||
+       die "-b works only with the quilt driver"
+
+if [ -z "$branches" ]; then
+       # this check is only needed when no branches have been passed
+       name="$(git symbolic-ref HEAD | sed 's#^refs/heads/##')"
+       base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
+               die "not on a TopGit-controlled branch"
+fi
 
 
 playground="$(mktemp -d -t tg-export.XXXXXX)"
@@ -81,9 +91,13 @@ collapsed_commit()
                        $(for p in $parent; do echo -p $p; done))"
        fi
 
-       (printf '%s\n\n' "$SUBJECT"; cat "$playground/^msg") |
-       git stripspace |
-       git commit-tree "$(pretty_tree "$name")" -p "$parent"
+       if branch_empty "$name"; then
+               echo "$parent";
+       else
+               (printf '%s\n\n' "$SUBJECT"; cat "$playground/^msg") |
+               git stripspace |
+               git commit-tree "$(pretty_tree "$name")" -p "$parent"
+       fi;
 
        echo "$name" >>"$playground/^ticker"
 }
@@ -130,10 +144,14 @@ quilt()
                return
        fi
 
-       echo "Exporting $_dep"
-       mkdir -p "$(dirname "$filename")"
-       $tg patch "$_dep" >"$filename"
-       echo "$_dep.diff -p1" >>"$output/series"
+       if branch_empty "$_dep"; then
+               echo "Skip empty patch $_dep";
+       else
+               echo "Exporting $_dep"
+               mkdir -p "$(dirname "$filename")"
+               $tg patch "$_dep" >"$filename"
+               echo "$_dep.diff -p1" >>"$output/series"
+       fi
 }
 
 
@@ -157,6 +175,7 @@ fi
 
 driver()
 {
+       case $_dep in refs/remotes/*) return;; esac
        branch_needs_update >/dev/null
        [ "$_ret" -eq 0 ] ||
                die "cancelling export of $_dep (-> $_name): branch not up-to-date"
@@ -166,8 +185,16 @@ driver()
 
 # Call driver on all the branches - this will happen
 # in topological order.
-recurse_deps driver "$name"
-(_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; driver)
+if [ -z "$branches" ]; then
+       recurse_deps driver "$name"
+       (_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; driver)
+else
+       echo "$branches" | tr ',' '\n' | while read _dep; do
+               _dep_is_tgish=1
+               $driver
+       done
+       name="$(echo "$branches" | sed 's/.*,//')"
+fi
 
 
 if [ "$driver" = "collapse" ]; then
@@ -180,3 +207,5 @@ elif [ "$driver" = "quilt" ]; then
        depcount="$(cat "$output/series" | wc -l)"
        echo "Exported topic branch $name (total $depcount topics) to directory $output"
 fi
+
+# vim:noet