mirror of
https://github.com/git/git
synced 2024-11-05 04:53:18 +00:00
dccf6c16f1
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
265 lines
8.7 KiB
C
265 lines
8.7 KiB
C
#ifndef GRAPH_H
|
|
#define GRAPH_H
|
|
#include "diff.h"
|
|
|
|
/**
|
|
* The graph API is used to draw a text-based representation of the commit
|
|
* history. The API generates the graph in a line-by-line fashion.
|
|
*
|
|
* Calling sequence
|
|
* ----------------
|
|
*
|
|
* - Create a `struct git_graph` by calling `graph_init()`. When using the
|
|
* revision walking API, this is done automatically by `setup_revisions()` if
|
|
* the '--graph' option is supplied.
|
|
*
|
|
* - Use the revision walking API to walk through a group of contiguous commits.
|
|
* The `get_revision()` function automatically calls `graph_update()` each time
|
|
* it is invoked.
|
|
*
|
|
* - For each commit, call `graph_next_line()` repeatedly, until
|
|
* `graph_is_commit_finished()` returns non-zero. Each call to
|
|
* `graph_next_line()` will output a single line of the graph. The resulting
|
|
* lines will not contain any newlines. `graph_next_line()` returns 1 if the
|
|
* resulting line contains the current commit, or 0 if this is merely a line
|
|
* needed to adjust the graph before or after the current commit. This return
|
|
* value can be used to determine where to print the commit summary information
|
|
* alongside the graph output.
|
|
*
|
|
* Limitations
|
|
* -----------
|
|
* - Check the graph_update() function for its limitations.
|
|
*
|
|
* - The graph API does not currently support reverse commit ordering. In
|
|
* order to implement reverse ordering, the graphing API needs an
|
|
* (efficient) mechanism to find the children of a commit.
|
|
*
|
|
* Sample usage
|
|
* ------------
|
|
*
|
|
* ------------
|
|
* struct commit *commit;
|
|
* struct git_graph *graph = graph_init(opts);
|
|
*
|
|
* while ((commit = get_revision(opts)) != NULL) {
|
|
* while (!graph_is_commit_finished(graph))
|
|
* {
|
|
* struct strbuf sb;
|
|
* int is_commit_line;
|
|
*
|
|
* strbuf_init(&sb, 0);
|
|
* is_commit_line = graph_next_line(graph, &sb);
|
|
* fputs(sb.buf, stdout);
|
|
*
|
|
* if (is_commit_line)
|
|
* log_tree_commit(opts, commit);
|
|
* else
|
|
* putchar(opts->diffopt.line_termination);
|
|
* }
|
|
* }
|
|
* ------------
|
|
* Sample output
|
|
* -------------
|
|
*
|
|
* The following is an example of the output from the graph API. This output does
|
|
* not include any commit summary information--callers are responsible for
|
|
* outputting that information, if desired.
|
|
* ------------
|
|
* *
|
|
* *
|
|
* *
|
|
* |\
|
|
* * |
|
|
* | | *
|
|
* | \ \
|
|
* | \ \
|
|
* *-. \ \
|
|
* |\ \ \ \
|
|
* | | * | |
|
|
* | | | | | *
|
|
* | | | | | *
|
|
* | | | | | *
|
|
* | | | | | |\
|
|
* | | | | | | *
|
|
* | * | | | | |
|
|
* | | | | | * \
|
|
* | | | | | |\ |
|
|
* | | | | * | | |
|
|
* | | | | * | | |
|
|
* * | | | | | | |
|
|
* | |/ / / / / /
|
|
* |/| / / / / /
|
|
* * | | | | | |
|
|
* |/ / / / / /
|
|
* * | | | | |
|
|
* | | | | | *
|
|
* | | | | |/
|
|
* | | | | *
|
|
* ------------
|
|
*
|
|
*/
|
|
|
|
/* A graph is a pointer to this opaque structure */
|
|
struct git_graph;
|
|
|
|
/*
|
|
* Called to setup global display of line_prefix diff option.
|
|
*
|
|
* Passed a diff_options structure which indicates the line_prefix and the
|
|
* file to output the prefix to. This is sort of a hack used so that the
|
|
* line_prefix will be honored by all flows which also honor "--graph"
|
|
* regardless of whether a graph has actually been setup. The normal graph
|
|
* flow will honor the exact diff_options passed, but a NULL graph will cause
|
|
* display of a line_prefix to stdout.
|
|
*/
|
|
void graph_setup_line_prefix(struct diff_options *diffopt);
|
|
|
|
/*
|
|
* Set up a custom scheme for column colors.
|
|
*
|
|
* The default column color scheme inserts ANSI color escapes to colorize
|
|
* the graph. The various color escapes are stored in an array of strings
|
|
* where each entry corresponds to a color, except for the last entry,
|
|
* which denotes the escape for resetting the color back to the default.
|
|
* When generating the graph, strings from this array are inserted before
|
|
* and after the various column characters.
|
|
*
|
|
* This function allows you to enable a custom array of color escapes.
|
|
* The 'colors_max' argument is the index of the last "reset" entry.
|
|
*
|
|
* This functions must be called BEFORE graph_init() is called.
|
|
*
|
|
* NOTE: This function isn't used in Git outside graph.c but it is used
|
|
* by CGit (http://git.zx2c4.com/cgit/) to use HTML for colors.
|
|
*/
|
|
void graph_set_column_colors(const char **colors, unsigned short colors_max);
|
|
|
|
/*
|
|
* Create a new struct git_graph.
|
|
*/
|
|
struct git_graph *graph_init(struct rev_info *opt);
|
|
|
|
/*
|
|
* Free a struct git_graph.
|
|
*/
|
|
void graph_clear(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.
|
|
*
|
|
* Limitations:
|
|
* -----------
|
|
*
|
|
* - `graph_update()` must be called with commits in topological order. It should
|
|
* not be called on a commit if it has already been invoked with an ancestor of
|
|
* that commit, or the graph output will be incorrect.
|
|
*
|
|
* - `graph_update()` must be called on a contiguous group of commits. If
|
|
* `graph_update()` is called on a particular commit, it should later be called
|
|
* on all parents of that commit. Parents must not be skipped, or the graph
|
|
* output will appear incorrect.
|
|
*
|
|
* - `graph_update()` may be used on a pruned set of commits only if the parent list
|
|
* has been rewritten so as to include only ancestors from the pruned set.
|
|
*/
|
|
void graph_update(struct git_graph *graph, struct commit *commit);
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* If `graph_update()` is called before all lines for the current commit have
|
|
* been printed, the next call to `graph_next_line()` will output an ellipsis,
|
|
* to indicate that a portion of the graph was omitted.
|
|
*/
|
|
int graph_is_commit_finished(struct git_graph const *graph);
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* NOTE: This function isn't used in Git outside graph.c but it is used
|
|
* by CGit (http://git.zx2c4.com/cgit/) to wrap HTML around graph lines.
|
|
*/
|
|
int graph_next_line(struct git_graph *graph, struct strbuf *sb);
|
|
|
|
|
|
/*
|
|
* Return current width of the graph in on-screen characters.
|
|
*/
|
|
int graph_width(struct git_graph *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.
|
|
* Returns 1 if output was printed, and 0 if no output was necessary.
|
|
*/
|
|
int graph_show_remainder(struct git_graph *graph);
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* It is better than directly calling `graph_show_strbuf()` followed by
|
|
* `graph_show_remainder()` since it properly handles buffers that do not end in
|
|
* a terminating newline.
|
|
*
|
|
* 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.
|
|
*
|
|
* Note that unlike some other graph display functions, you must pass the file
|
|
* handle directly. It is assumed that this is the same file handle as the
|
|
* file specified by the graph diff options. This is necessary so that
|
|
* graph_show_commit_msg can be called even with a NULL graph.
|
|
*/
|
|
void graph_show_commit_msg(struct git_graph *graph,
|
|
FILE *file,
|
|
struct strbuf const *sb);
|
|
|
|
#endif /* GRAPH_H */
|