notes.h

   1 #ifndef NOTES_H
   2 #define NOTES_H
   3
   4 /*
   5  * Flags controlling behaviour of notes tree initialization
   6  *
   7  * Default behaviour is to initialize the notes tree from the tree object
   8  * specified by the given (or default) notes ref.
   9  */
  10 #define NOTES_INIT_EMPTY 1
  11
  12 /*
  13  * Initialize internal notes tree structure with the notes tree at the given
  14  * ref. If given ref is NULL, the value of the $GIT_NOTES_REF environment
  15  * variable is used, and if that is missing, the default notes ref is used
  16  * ("refs/notes/commits").
  17  *
  18  * If you need to re-intialize the internal notes tree structure (e.g. loading
  19  * from a different notes ref), please first de-initialize the current notes
  20  * tree by calling free_notes().
  21  */
  22 void init_notes(const char *notes_ref, int flags);
  23
  24 /*
  25  * Add the given note object to the internal notes tree structure
  26  *
  27  * IMPORTANT: The changes made by add_note() to the internal notes tree structure
  28  * are not persistent until a subsequent call to write_notes_tree() returns
  29  * zero.
  30  */
  31 void add_note(const unsigned char *object_sha1,
  32                 const unsigned char *note_sha1);
  33
  34 /*
  35  * Remove the given note object from the internal notes tree structure
  36  *
  37  * IMPORTANT: The changes made by remove_note() to the internal notes tree
  38  * structure are not persistent until a subsequent call to write_notes_tree()
  39  * returns zero.
  40  */
  41 void remove_note(const unsigned char *object_sha1);
  42
  43 /*
  44  * Get the note object SHA1 containing the note data for the given object
  45  *
  46  * Return NULL if the given object has no notes.
  47  */
  48 const unsigned char *get_note(const unsigned char *object_sha1);
  49
  50 /*
  51  * Flags controlling behaviour of for_each_note()
  52  *
  53  * Default behaviour of for_each_note() is to traverse every single note object
  54  * in the notes tree, unpacking subtree entries along the way.
  55  * The following flags can be used to alter the default behaviour:
  56  *
  57  * - DONT_UNPACK_SUBTREES causes for_each_note() NOT to unpack and recurse into
  58  *   subtree entries while traversing the notes tree. This causes notes within
  59  *   those subtrees NOT to be passed to the callback. Use this flag if you
  60  *   don't want to traverse _all_ notes, but only want to traverse the parts
  61  *   of the notes tree that have already been unpacked (this includes at least
  62  *   all notes that have been added/changed).
  63  *
  64  * - YIELD_SUBTREES causes any subtree entries that are encountered to be
  65  *   passed to the callback, before recursing into them. Subtree entries are
  66  *   not note objects, but represent intermediate directories in the notes
  67  *   tree. When passed to the callback, subtree entries will have a trailing
  68  *   slash in their path, which the callback may use to differentiate between
  69  *   note entries and subtree entries. Note that already-unpacked subtree
  70  *   entries are not part of the notes tree, and will therefore not be yielded.
  71  *   If this flag is used together with DONT_UNPACK_SUBTREES, for_each_note()
  72  *   will yield the subtree entry, but not recurse into it.
  73  */
  74 #define FOR_EACH_NOTE_DONT_UNPACK_SUBTREES 1
  75 #define FOR_EACH_NOTE_YIELD_SUBTREES 2
  76
  77 /*
  78  * Invoke the specified callback function for each note
  79  *
  80  * If the callback returns nonzero, the note walk is aborted, and the return
  81  * value from the callback is returned from for_each_note(). Hence, a zero
  82  * return value from for_each_note() indicates that all notes were walked
  83  * successfully.
  84  *
  85  * IMPORTANT: The callback function is NOT allowed to change the notes tree.
  86  * In other words, the following functions can NOT be invoked (on the current
  87  * notes tree) from within the callback:
  88  * - add_note()
  89  * - remove_note()
  90  * - free_notes()
  91  */
  92 typedef int each_note_fn(const unsigned char *object_sha1,
  93                 const unsigned char *note_sha1, char *note_path,
  94                 void *cb_data);
  95 int for_each_note(int flags, each_note_fn fn, void *cb_data);
  96
  97 /*
  98  * Write the internal notes tree structure to the object database
  99  *
 100  * Creates a new tree object encapsulating the current state of the
 101  * internal notes tree, and stores its SHA1 into the 'result' argument.
 102  *
 103  * Returns zero on success, non-zero on failure.
 104  *
 105  * IMPORTANT: Changes made to the internal notes tree structure are not
 106  * persistent until this function has returned zero. Please also remember
 107  * to create a corresponding commit object, and update the appropriate
 108  * notes ref.
 109  */
 110 int write_notes_tree(unsigned char *result);
 111
 112 /*
 113  * Free (and de-initialize) the internal notes tree structure
 114  *
 115  * IMPORTANT: Changes made to the notes tree since the last, successful
 116  * call to write_notes_tree() will be lost.
 117  */
 118 void free_notes(void);
 119
 120 /* Flags controlling how notes are formatted */
 121 #define NOTES_SHOW_HEADER 1
 122 #define NOTES_INDENT 2
 123
 124 /*
 125  * Fill the given strbuf with the notes associated with the given object.
 126  *
 127  * If the internal notes structure is not initialized, it will be auto-
 128  * initialized to the default value (see documentation for init_notes() above).
 129  *
 130  * 'flags' is a bitwise combination of the above formatting flags.
 131  */
 132 void format_note(const unsigned char *object_sha1, struct strbuf *sb,
 133                 const char *output_encoding, int flags);
 134
 135 #endif