Add scripts to unabsorb git dirs

They do reverse of `git submodule absorbgitdirs`.
There are simple and recursive variants.

diff --git a/submodules/unabsorbgitdirs b/submodules/unabsorbgitdirs
new file mode 100755 (executable)
index 0000000..2416477
--- /dev/null
+++ b/submodules/unabsorbgitdirs
@@ -0,0 +1,23 @@
+#! /bin/sh
+set -e
+
+# To the top-level directory of the current submodule
+cd "`git rev-parse --show-toplevel`"
+
+unset GIT_DIR
+
+# If .git/ subdirectory is already here
+test -d .git && exit 0
+
+if ! test -f .git; then
+    echo "Error: Cannot find gitlink, aborting" >&2
+    exit 1
+fi
+
+# Fix core.worktree now
+git config --unset core.worktree
+
+read _gitdir gitpath < .git
+unset _gitdir
+rm .git
+exec mv "$gitpath" .git

diff --git a/submodules/unabsorbgitdirs-recursive b/submodules/unabsorbgitdirs-recursive
new file mode 100755 (executable)
index 0000000..72b4464
--- /dev/null
+++ b/submodules/unabsorbgitdirs-recursive
@@ -0,0 +1,38 @@
+#! /bin/sh
+# The script cannot be run with `git submodule foreach --recursive`
+# because the command runs recursively from top to bottom
+# while the command is required to be run from bottom to top
+# because it doesn't fix childrens' gitlinks.
+# So the script runs recursion itself;
+# it can be run with `git submodule foreach` without `--recursive`.
+set -e
+
+START_DIR="`pwd`"
+cd "`dirname \"$0\"`"
+PROG_DIR="`pwd`"
+cd "$START_DIR"
+
+# To the top-level directory of the current submodule or the superproject
+cd "`git rev-parse --show-toplevel`"
+
+unset GIT_DIR
+
+# If .git/ subdirectory is already here
+test -d .git && exit 0
+
+if ! test -f .git; then
+    echo "Error: Cannot find gitlink, aborting" >&2
+    exit 1
+fi
+
+if test -f .gitmodules; then
+    git submodule foreach "$PROG_DIR"/"`basename \"$0\"`"
+fi
+
+# Fix core.worktree now
+git config --unset core.worktree
+
+read _gitdir gitpath < .git
+unset _gitdir
+rm .git
+exec mv "$gitpath" .git