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660e113ce1
Add an extension to git-diff and git-log (and any other graph-aware displayable output) such that "--line-prefix=<string>" will print the additional line-prefix on every line of output. To make this work, we have to fix a few bugs in the graph API that force graph_show_commit_msg to be used only when you have a valid graph. Additionally, we extend the default_diff_output_prefix handler to work even when no graph is enabled. This is somewhat of a hack on top of the graph API, but I think it should be acceptable here. This will be used by a future extension of submodule display which displays the submodule diff as the actual diff between the pre and post commit in the submodule project. Add some tests for both git-log and git-diff to ensure that the prefix is honored correctly. Signed-off-by: Jacob Keller <jacob.keller@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
140 lines
4.9 KiB
C
140 lines
4.9 KiB
C
#ifndef GRAPH_H
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#define GRAPH_H
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#include "diff.h"
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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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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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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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*/
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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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* 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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