Symlink identical files if they are not yet linked

Edge case: a file is a copy of a dotfile but is not linked. In this case
we should link it.

3 files changed, 29 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index d4ac330..ed8ea2a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -35,6 +35,7 @@ TESTS = \
 	test/rcup-hostname.t \
 	test/rcup-standalone.t \
 	test/rcup-symlink-dirs.t \
+	test/rcup-symlink-existing.t \
 	test/rcup-usage.t \
 	test/rcdn-hooks.t \
 	test/rcdn-hooks-run-in-situ.t \
diff --git a/bin/rcup.in b/bin/rcup.in
index bdae664..de11751 100755
--- a/bin/rcup.in
+++ b/bin/rcup.in
@@ -130,6 +130,18 @@ is_identical() {
   diff -c "$1" "$2" > /dev/null 2>&1
 }
 
+is_linked() {
+  local src="$1"
+  local dest="$2"
+
+  if [ -h "$dest" ]; then
+    local link_dest=$(readlink $dest)
+    [ "$link_dest" == "$src" ]
+  else
+    return 1
+  fi  
+}
+
 handle_dir() {
   local dest="$1"
 
@@ -148,7 +160,12 @@ handle_file() {
 
   if [ "$generate" -ne 1 -a -e "$dest" ]; then
     if is_identical "$src" "$dest"; then
-      $VERBOSE "identical $dest"
+      if [ "x$sigil" != "xX" ] && ! is_linked "$src" "$dest"; then
+        $VERBOSE "replacing identical but unlinked $dest"
+        replace_file "$src" "$dest" "$sigil"
+      else
+        $VERBOSE "identical $dest"
+      fi
     elif [ $REPLACE_ALL -eq 1 ]; then
       replace_file "$src" "$dest" "$sigil"
     else
diff --git a/test/rcup-symlink-existing.t b/test/rcup-symlink-existing.t
new file mode 100644
index 0000000..d311b93
--- /dev/null
+++ b/test/rcup-symlink-existing.t
@@ -0,0 +1,10 @@
+  $ . "$TESTDIR/helper.sh"
+
+Symlinks files even if they are identical
+
+  $ mkdir -p .dotfiles
+  > echo find-me > "$HOME/.door"
+  > echo find-me > .dotfiles/door
+
+  $ rcup
+  > assert_linked "$HOME/.door" "$HOME/.dotfiles/door"