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Enable custom schemes for column colors in the graph API

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Currently, the graph code is hardcoded to use ANSI color escapes for
coloring the column characters in the generated graphs. This patch
allows a custom scheme of colors to be set at runtime, allowing
different types of color escapes to be used.

A new function - graph_set_column_colors() - is added to the graph.h API,
which allows a custom column_colors array (and column_colors_max value)
to replace the builtin ANSI array (and _max value). The new function -
if used - must be called before graph_init() is called.

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johan Herland 2010-07-13 23:23:39 +02:00 committed by Junio C Hamano
parent 6bdc17d9a6
commit 1e3d4119d2
2 changed files with 43 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
graph.c
View File

@ -62,7 +62,7 @@ enum graph_state {
/*
* The list of available column colors.
*/
static char column_colors[][COLOR_MAXLEN] = {
static const char *column_colors_ansi[] = {
GIT_COLOR_RED,
GIT_COLOR_GREEN,
GIT_COLOR_YELLOW,
@ -75,23 +75,33 @@ static char column_colors[][COLOR_MAXLEN] = {
GIT_COLOR_BOLD_BLUE,
GIT_COLOR_BOLD_MAGENTA,
GIT_COLOR_BOLD_CYAN,
GIT_COLOR_RESET,
};
#define COLUMN_COLORS_MAX (ARRAY_SIZE(column_colors))
#define COLUMN_COLORS_ANSI_MAX (ARRAY_SIZE(column_colors_ansi) - 1)
static const char *column_get_color_code(const struct column *c)
static const char **column_colors;
static unsigned short column_colors_max;
void graph_set_column_colors(const char **colors, unsigned short colors_max)
{
return column_colors[c->color];
column_colors = colors;
column_colors_max = colors_max;
}
static const char *column_get_color_code(unsigned short color)
{
return column_colors[color];
}
static void strbuf_write_column(struct strbuf *sb, const struct column *c,
char col_char)
{
if (c->color < COLUMN_COLORS_MAX)
strbuf_addstr(sb, column_get_color_code(c));
if (c->color < column_colors_max)
strbuf_addstr(sb, column_get_color_code(c->color));
strbuf_addch(sb, col_char);
if (c->color < COLUMN_COLORS_MAX)
strbuf_addstr(sb, GIT_COLOR_RESET);
if (c->color < column_colors_max)
strbuf_addstr(sb, column_get_color_code(column_colors_max));
}
struct git_graph {
@ -215,6 +225,11 @@ static struct strbuf *diff_output_prefix_callback(struct diff_options *opt, void
struct git_graph *graph_init(struct rev_info *opt)
{
struct git_graph *graph = xmalloc(sizeof(struct git_graph));
if (!column_colors)
graph_set_column_colors(column_colors_ansi,
COLUMN_COLORS_ANSI_MAX);
graph->commit = NULL;
graph->revs = opt;
graph->num_parents = 0;
@ -231,7 +246,7 @@ struct git_graph *graph_init(struct rev_info *opt)
* always increment it for the first commit we output.
* This way we start at 0 for the first commit.
*/
graph->default_column_color = COLUMN_COLORS_MAX - 1;
graph->default_column_color = column_colors_max - 1;
/*
* Allocate a reasonably large default number of columns
@ -354,7 +369,7 @@ static struct commit_list *first_interesting_parent(struct git_graph *graph)
static unsigned short graph_get_current_column_color(const struct git_graph *graph)
{
if (!DIFF_OPT_TST(&graph->revs->diffopt, COLOR_DIFF))
return COLUMN_COLORS_MAX;
return column_colors_max;
return graph->default_column_color;
}
@ -364,7 +379,7 @@ static unsigned short graph_get_current_column_color(const struct git_graph *gra
static void graph_increment_column_color(struct git_graph *graph)
{
graph->default_column_color = (graph->default_column_color + 1) %
COLUMN_COLORS_MAX;
column_colors_max;
}
static unsigned short graph_find_commit_color(const struct git_graph *graph,

17
graph.h
View File

@ -4,6 +4,23 @@
/* A graph is a pointer to this opaque structure */
struct git_graph;
/*
* 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.
*/
void graph_set_column_colors(const char **colors, unsigned short colors_max);
/*
* Create a new struct git_graph.
*/