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1 | #ifndef NOTES_H | |
2 | #define NOTES_H | |
3 | ||
4 | /* | |
5 | * Function type for combining two notes annotating the same object. | |
6 | * | |
7 | * When adding a new note annotating the same object as an existing note, it is | |
8 | * up to the caller to decide how to combine the two notes. The decision is | |
9 | * made by passing in a function of the following form. The function accepts | |
10 | * two SHA1s -- of the existing note and the new note, respectively. The | |
11 | * function then combines the notes in whatever way it sees fit, and writes the | |
12 | * resulting SHA1 into the first SHA1 argument (cur_sha1). A non-zero return | |
13 | * value indicates failure. | |
14 | * | |
15 | * The two given SHA1s must both be non-NULL and different from each other. | |
16 | * | |
17 | * The default combine_notes function (you get this when passing NULL) is | |
18 | * combine_notes_concatenate(), which appends the contents of the new note to | |
19 | * the contents of the existing note. | |
20 | */ | |
21 | typedef int combine_notes_fn(unsigned char *cur_sha1, const unsigned char *new_sha1); | |
22 | ||
23 | /* Common notes combinators */ | |
24 | int combine_notes_concatenate(unsigned char *cur_sha1, const unsigned char *new_sha1); | |
25 | int combine_notes_overwrite(unsigned char *cur_sha1, const unsigned char *new_sha1); | |
26 | int combine_notes_ignore(unsigned char *cur_sha1, const unsigned char *new_sha1); | |
27 | ||
28 | /* | |
29 | * Notes tree object | |
30 | * | |
31 | * Encapsulates the internal notes tree structure associated with a notes ref. | |
32 | * Whenever a struct notes_tree pointer is required below, you may pass NULL in | |
33 | * order to use the default/internal notes tree. E.g. you only need to pass a | |
34 | * non-NULL value if you need to refer to several different notes trees | |
35 | * simultaneously. | |
36 | */ | |
37 | extern struct notes_tree { | |
38 | struct int_node *root; | |
39 | struct non_note *first_non_note, *prev_non_note; | |
40 | char *ref; | |
41 | combine_notes_fn *combine_notes; | |
42 | int initialized; | |
43 | } default_notes_tree; | |
44 | ||
45 | /* | |
46 | * Flags controlling behaviour of notes tree initialization | |
47 | * | |
48 | * Default behaviour is to initialize the notes tree from the tree object | |
49 | * specified by the given (or default) notes ref. | |
50 | */ | |
51 | #define NOTES_INIT_EMPTY 1 | |
52 | ||
53 | /* | |
54 | * Initialize the given notes_tree with the notes tree structure at the given | |
55 | * ref. If given ref is NULL, the value of the $GIT_NOTES_REF environment | |
56 | * variable is used, and if that is missing, the default notes ref is used | |
57 | * ("refs/notes/commits"). | |
58 | * | |
59 | * If you need to re-intialize a notes_tree structure (e.g. when switching from | |
60 | * one notes ref to another), you must first de-initialize the notes_tree | |
61 | * structure by calling free_notes(struct notes_tree *). | |
62 | * | |
63 | * If you pass t == NULL, the default internal notes_tree will be initialized. | |
64 | * | |
65 | * The combine_notes function that is passed becomes the default combine_notes | |
66 | * function for the given notes_tree. If NULL is passed, the default | |
67 | * combine_notes function is combine_notes_concatenate(). | |
68 | * | |
69 | * Precondition: The notes_tree structure is zeroed (this can be achieved with | |
70 | * memset(t, 0, sizeof(struct notes_tree))) | |
71 | */ | |
72 | void init_notes(struct notes_tree *t, const char *notes_ref, | |
73 | combine_notes_fn combine_notes, int flags); | |
74 | ||
75 | /* | |
76 | * Add the given note object to the given notes_tree structure | |
77 | * | |
78 | * IMPORTANT: The changes made by add_note() to the given notes_tree structure | |
79 | * are not persistent until a subsequent call to write_notes_tree() returns | |
80 | * zero. | |
81 | */ | |
82 | void add_note(struct notes_tree *t, const unsigned char *object_sha1, | |
83 | const unsigned char *note_sha1, combine_notes_fn combine_notes); | |
84 | ||
85 | /* | |
86 | * Remove the given note object from the given notes_tree structure | |
87 | * | |
88 | * IMPORTANT: The changes made by remove_note() to the given notes_tree | |
89 | * structure are not persistent until a subsequent call to write_notes_tree() | |
90 | * returns zero. | |
91 | */ | |
92 | void remove_note(struct notes_tree *t, const unsigned char *object_sha1); | |
93 | ||
94 | /* | |
95 | * Get the note object SHA1 containing the note data for the given object | |
96 | * | |
97 | * Return NULL if the given object has no notes. | |
98 | */ | |
99 | const unsigned char *get_note(struct notes_tree *t, | |
100 | const unsigned char *object_sha1); | |
101 | ||
102 | /* | |
103 | * Flags controlling behaviour of for_each_note() | |
104 | * | |
105 | * Default behaviour of for_each_note() is to traverse every single note object | |
106 | * in the given notes tree, unpacking subtree entries along the way. | |
107 | * The following flags can be used to alter the default behaviour: | |
108 | * | |
109 | * - DONT_UNPACK_SUBTREES causes for_each_note() NOT to unpack and recurse into | |
110 | * subtree entries while traversing the notes tree. This causes notes within | |
111 | * those subtrees NOT to be passed to the callback. Use this flag if you | |
112 | * don't want to traverse _all_ notes, but only want to traverse the parts | |
113 | * of the notes tree that have already been unpacked (this includes at least | |
114 | * all notes that have been added/changed). | |
115 | * | |
116 | * - YIELD_SUBTREES causes any subtree entries that are encountered to be | |
117 | * passed to the callback, before recursing into them. Subtree entries are | |
118 | * not note objects, but represent intermediate directories in the notes | |
119 | * tree. When passed to the callback, subtree entries will have a trailing | |
120 | * slash in their path, which the callback may use to differentiate between | |
121 | * note entries and subtree entries. Note that already-unpacked subtree | |
122 | * entries are not part of the notes tree, and will therefore not be yielded. | |
123 | * If this flag is used together with DONT_UNPACK_SUBTREES, for_each_note() | |
124 | * will yield the subtree entry, but not recurse into it. | |
125 | */ | |
126 | #define FOR_EACH_NOTE_DONT_UNPACK_SUBTREES 1 | |
127 | #define FOR_EACH_NOTE_YIELD_SUBTREES 2 | |
128 | ||
129 | /* | |
130 | * Invoke the specified callback function for each note in the given notes_tree | |
131 | * | |
132 | * If the callback returns nonzero, the note walk is aborted, and the return | |
133 | * value from the callback is returned from for_each_note(). Hence, a zero | |
134 | * return value from for_each_note() indicates that all notes were walked | |
135 | * successfully. | |
136 | * | |
137 | * IMPORTANT: The callback function is NOT allowed to change the notes tree. | |
138 | * In other words, the following functions can NOT be invoked (on the current | |
139 | * notes tree) from within the callback: | |
140 | * - add_note() | |
141 | * - remove_note() | |
142 | * - free_notes() | |
143 | */ | |
144 | typedef int each_note_fn(const unsigned char *object_sha1, | |
145 | const unsigned char *note_sha1, char *note_path, | |
146 | void *cb_data); | |
147 | int for_each_note(struct notes_tree *t, int flags, each_note_fn fn, | |
148 | void *cb_data); | |
149 | ||
150 | /* | |
151 | * Write the given notes_tree structure to the object database | |
152 | * | |
153 | * Creates a new tree object encapsulating the current state of the given | |
154 | * notes_tree, and stores its SHA1 into the 'result' argument. | |
155 | * | |
156 | * Returns zero on success, non-zero on failure. | |
157 | * | |
158 | * IMPORTANT: Changes made to the given notes_tree are not persistent until | |
159 | * this function has returned zero. Please also remember to create a | |
160 | * corresponding commit object, and update the appropriate notes ref. | |
161 | */ | |
162 | int write_notes_tree(struct notes_tree *t, unsigned char *result); | |
163 | ||
164 | /* | |
165 | * Remove all notes annotating non-existing objects from the given notes tree | |
166 | * | |
167 | * All notes in the given notes_tree that are associated with objects that no | |
168 | * longer exist in the database, are removed from the notes tree. | |
169 | * | |
170 | * IMPORTANT: The changes made by prune_notes() to the given notes_tree | |
171 | * structure are not persistent until a subsequent call to write_notes_tree() | |
172 | * returns zero. | |
173 | */ | |
174 | void prune_notes(struct notes_tree *t); | |
175 | ||
176 | /* | |
177 | * Free (and de-initialize) the given notes_tree structure | |
178 | * | |
179 | * IMPORTANT: Changes made to the given notes_tree since the last, successful | |
180 | * call to write_notes_tree() will be lost. | |
181 | */ | |
182 | void free_notes(struct notes_tree *t); | |
183 | ||
184 | /* Flags controlling how notes are formatted */ | |
185 | #define NOTES_SHOW_HEADER 1 | |
186 | #define NOTES_INDENT 2 | |
187 | ||
188 | /* | |
189 | * Fill the given strbuf with the notes associated with the given object. | |
190 | * | |
191 | * If the given notes_tree structure is not initialized, it will be auto- | |
192 | * initialized to the default value (see documentation for init_notes() above). | |
193 | * If the given notes_tree is NULL, the internal/default notes_tree will be | |
194 | * used instead. | |
195 | * | |
196 | * 'flags' is a bitwise combination of the above formatting flags. | |
197 | */ | |
198 | void format_note(struct notes_tree *t, const unsigned char *object_sha1, | |
199 | struct strbuf *sb, const char *output_encoding, int flags); | |
200 | ||
201 | ||
202 | struct string_list; | |
203 | ||
204 | struct display_notes_opt { | |
205 | int suppress_default_notes:1; | |
206 | struct string_list *extra_notes_refs; | |
207 | }; | |
208 | ||
209 | /* | |
210 | * Load the notes machinery for displaying several notes trees. | |
211 | * | |
212 | * If 'opt' is not NULL, then it specifies additional settings for the | |
213 | * displaying: | |
214 | * | |
215 | * - suppress_default_notes indicates that the notes from | |
216 | * core.notesRef and notes.displayRef should not be loaded. | |
217 | * | |
218 | * - extra_notes_refs may contain a list of globs (in the same style | |
219 | * as notes.displayRef) where notes should be loaded from. | |
220 | */ | |
221 | void init_display_notes(struct display_notes_opt *opt); | |
222 | ||
223 | /* | |
224 | * Append notes for the given 'object_sha1' from all trees set up by | |
225 | * init_display_notes() to 'sb'. The 'flags' are a bitwise | |
226 | * combination of | |
227 | * | |
228 | * - NOTES_SHOW_HEADER: add a 'Notes (refname):' header | |
229 | * | |
230 | * - NOTES_INDENT: indent the notes by 4 places | |
231 | * | |
232 | * You *must* call init_display_notes() before using this function. | |
233 | */ | |
234 | void format_display_notes(const unsigned char *object_sha1, | |
235 | struct strbuf *sb, const char *output_encoding, int flags); | |
236 | ||
237 | /* | |
238 | * Load the notes tree from each ref listed in 'refs'. The output is | |
239 | * an array of notes_tree*, terminated by a NULL. | |
240 | */ | |
241 | struct notes_tree **load_notes_trees(struct string_list *refs); | |
242 | ||
243 | /* | |
244 | * Add all refs that match 'glob' to the 'list'. | |
245 | */ | |
246 | void string_list_add_refs_by_glob(struct string_list *list, const char *glob); | |
247 | ||
248 | /* | |
249 | * Add all refs from a colon-separated glob list 'globs' to the end of | |
250 | * 'list'. Empty components are ignored. This helper is used to | |
251 | * parse GIT_NOTES_DISPLAY_REF style environment variables. | |
252 | */ | |
253 | void string_list_add_refs_from_colon_sep(struct string_list *list, | |
254 | const char *globs); | |
255 | ||
256 | #endif |