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Diffstat (limited to 'graph.h')
| -rw-r--r-- | graph.h | 121 |
1 files changed, 121 insertions, 0 deletions
@@ -0,0 +1,121 @@ +#ifndef GRAPH_H +#define GRAPH_H + +/* A graph is a pointer to this opaque structure */ +struct git_graph; + +/* + * Create a new struct git_graph. + * The graph should be freed with graph_release() when no longer needed. + */ +struct git_graph *graph_init(); + +/* + * Destroy a struct git_graph and free associated memory. + */ +void graph_release(struct git_graph *graph); + +/* + * Update a git_graph with a new commit. + * This will cause the graph to begin outputting lines for the new commit + * the next time graph_next_line() is called. + * + * If graph_update() is called before graph_is_commit_finished() returns 1, + * the next call to graph_next_line() will output an ellipsis ("...") + * to indicate that a portion of the graph is missing. + */ +void graph_update(struct git_graph *graph, struct commit *commit); + +/* + * Output the next line for a graph. + * This formats the next graph line into the specified strbuf. It is not + * terminated with a newline. + * + * Returns 1 if the line includes the current commit, and 0 otherwise. + * graph_next_line() will return 1 exactly once for each time + * graph_update() is called. + */ +int graph_next_line(struct git_graph *graph, struct strbuf *sb); + +/* + * Output a padding line in the graph. + * This is similar to graph_next_line(). However, it is guaranteed to + * never print the current commit line. Instead, if the commit line is + * next, it will simply output a line of vertical padding, extending the + * branch lines downwards, but leaving them otherwise unchanged. + */ +void graph_padding_line(struct git_graph *graph, struct strbuf *sb); + +/* + * Determine if a graph has finished outputting lines for the current + * commit. + * + * Returns 1 if graph_next_line() needs to be called again before + * graph_update() should be called. Returns 0 if no more lines are needed + * for this commit. If 0 is returned, graph_next_line() may still be + * called without calling graph_update(), and it will merely output + * appropriate "vertical padding" in the graph. + */ +int graph_is_commit_finished(struct git_graph const *graph); + + +/* + * graph_show_*: helper functions for printing to stdout + */ + + +/* + * If the graph is non-NULL, print the history graph to stdout, + * up to and including the line containing this commit. + * Does not print a terminating newline on the last line. + */ +void graph_show_commit(struct git_graph *graph); + +/* + * If the graph is non-NULL, print one line of the history graph to stdout. + * Does not print a terminating newline on the last line. + */ +void graph_show_oneline(struct git_graph *graph); + +/* + * If the graph is non-NULL, print one line of vertical graph padding to + * stdout. Does not print a terminating newline on the last line. + */ +void graph_show_padding(struct git_graph *graph); + +/* + * If the graph is non-NULL, print the rest of the history graph for this + * commit to stdout. Does not print a terminating newline on the last line. + */ +int graph_show_remainder(struct git_graph *graph); + +/* + * Print a strbuf to stdout. If the graph is non-NULL, all lines but the + * first will be prefixed with the graph output. + * + * If the strbuf ends with a newline, the output will end after this + * newline. A new graph line will not be printed after the final newline. + * If the strbuf is empty, no output will be printed. + * + * Since the first line will not include the graph ouput, the caller is + * responsible for printing this line's graph (perhaps via + * graph_show_commit() or graph_show_oneline()) before calling + * graph_show_strbuf(). + */ +void graph_show_strbuf(struct git_graph *graph, struct strbuf const *sb); + +/* + * Print a commit message strbuf and the remainder of the graph to stdout. + * + * This is similar to graph_show_strbuf(), but it always prints the + * remainder of the graph. + * + * If the strbuf ends with a newline, the output printed by + * graph_show_commit_msg() will end with a newline. If the strbuf is + * missing a terminating newline (including if it is empty), the output + * printed by graph_show_commit_msg() will also be missing a terminating + * newline. + */ +void graph_show_commit_msg(struct git_graph *graph, struct strbuf const *sb); + +#endif /* GRAPH_H */ |