[PATCH v2 1/5] worktree.c: add find_worktree_by_path()

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So far we haven't needed to identify an existing worktree from command
line. Future commands such as lock or move will need it. There are of
course other options for identifying a worktree, for example by branch
or even by internal id. They may be added later if proved useful.

Helped-by: Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 worktree.c | 12 ++++++++++++
 worktree.h |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/worktree.c b/worktree.c
index f4a4f38..c5d45a6 100644
--- a/worktree.c
+++ b/worktree.c
@@ -214,6 +214,18 @@ const char *get_worktree_git_dir(const struct worktree *wt)
 		return git_common_path("worktrees/%s", wt->id);
 }
 
+struct worktree *find_worktree_by_path(struct worktree **list,
+				       const char *path_)
+{
+	char *path = xstrdup(real_path(path_));
+
+	for (; *list; list++)
+		if (!fspathcmp(path, real_path((*list)->path)))
+			break;
+	free(path);
+	return *list;
+}
+
 int is_worktree_being_rebased(const struct worktree *wt,
 			      const char *target)
 {
diff --git a/worktree.h b/worktree.h
index 1394909..91627fd 100644
--- a/worktree.h
+++ b/worktree.h
@@ -29,6 +29,12 @@ extern struct worktree **get_worktrees(void);
  */
 extern const char *get_worktree_git_dir(const struct worktree *wt);
 
+/*
+ * Search a worktree by its path. Paths are normalized internally.
+ */
+extern struct worktree *find_worktree_by_path(struct worktree **list,
+					      const char *path_);
+
 /*
  * Free up the memory for worktree(s)
  */
-- 
2.8.2.524.g6ff3d78

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