Notes API: init_notes(): Initialize the notes tree from the given notes ref

Created by a simple refactoring of initialize_notes().

Also add a new 'flags' parameter, which is a bitwise combination of notes
initialization flags. For now, there is only one flag - NOTES_INIT_EMPTY -
which indicates that the notes tree should not auto-load the contents of
the given (or default) notes ref, but rather should leave the notes tree
initialized to an empty state. This will become useful in the future when
manipulating the notes tree through the notes API.

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/notes.c b/notes.c
index 4ee4fec2331b651d66e04eeeca1b626d98d8f93e..3f4ae3534043798be86fcaa478246727bbbf4e1d 100644 (file)
--- a/notes.c
+++ b/notes.c
@@ -340,15 +340,28 @@ static void load_subtree(struct leaf_node *subtree, struct int_node *node,
        free(buf);
 }
 
-static void initialize_notes(const char *notes_ref_name)
+void init_notes(const char *notes_ref, int flags)
 {
        unsigned char sha1[20], object_sha1[20];
        unsigned mode;
        struct leaf_node root_tree;
 
-       if (!notes_ref_name || read_ref(notes_ref_name, object_sha1) ||
-           get_tree_entry(object_sha1, "", sha1, &mode))
+       assert(!initialized);
+       initialized = 1;
+
+       if (!notes_ref)
+               notes_ref = getenv(GIT_NOTES_REF_ENVIRONMENT);
+       if (!notes_ref)
+               notes_ref = notes_ref_name; /* value of core.notesRef config */
+       if (!notes_ref)
+               notes_ref = GIT_NOTES_DEFAULT_REF;
+
+       if (flags & NOTES_INIT_EMPTY || !notes_ref ||
+           read_ref(notes_ref, object_sha1))
                return;
+       if (get_tree_entry(object_sha1, "", sha1, &mode))
+               die("Failed to read notes tree referenced by %s (%s)",
+                   notes_ref, object_sha1);
 
        hashclr(root_tree.key_sha1);
        hashcpy(root_tree.val_sha1, sha1);
@@ -379,15 +392,8 @@ void format_note(const unsigned char *object_sha1, struct strbuf *sb,
        unsigned long linelen, msglen;
        enum object_type type;
 
-       if (!initialized) {
-               const char *env = getenv(GIT_NOTES_REF_ENVIRONMENT);
-               if (env)
-                       notes_ref_name = getenv(GIT_NOTES_REF_ENVIRONMENT);
-               else if (!notes_ref_name)
-                       notes_ref_name = GIT_NOTES_DEFAULT_REF;
-               initialize_notes(notes_ref_name);
-               initialized = 1;
-       }
+       if (!initialized)
+               init_notes(NULL, 0);
 
        sha1 = lookup_notes(object_sha1);
        if (!sha1)

diff --git a/notes.h b/notes.h
index d745ed12da5a412c78d7e97a65b66210930ae976..6b527991b01a714784f0184e250fff96944724dc 100644 (file)
--- a/notes.h
+++ b/notes.h
@@ -1,6 +1,26 @@
 #ifndef NOTES_H
 #define NOTES_H
 
+/*
+ * Flags controlling behaviour of notes tree initialization
+ *
+ * Default behaviour is to initialize the notes tree from the tree object
+ * specified by the given (or default) notes ref.
+ */
+#define NOTES_INIT_EMPTY 1
+
+/*
+ * Initialize internal notes tree structure with the notes tree at the given
+ * ref. If given ref is NULL, the value of the $GIT_NOTES_REF environment
+ * variable is used, and if that is missing, the default notes ref is used
+ * ("refs/notes/commits").
+ *
+ * If you need to re-intialize the internal notes tree structure (e.g. loading
+ * from a different notes ref), please first de-initialize the current notes
+ * tree by calling free_notes().
+ */
+void init_notes(const char *notes_ref, int flags);
+
 /* Free (and de-initialize) the internal notes tree structure */
 void free_notes(void);