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