Modified the graph drawing logic to colorize edges based on parent-child
relationships similiarly to gitk.
Signed-off-by: Allan Caffee <allan.caffee@xxxxxxxxx>
---
color.h | 1 +
graph.c | 246 ++++++++++++++++++++++++++++++++++++++++++++++++++------------
2 files changed, 199 insertions(+), 48 deletions(-)
diff --git a/color.h b/color.h
index 6846be1..18abeb7 100644
--- a/color.h
+++ b/color.h
@@ -11,6 +11,7 @@
#define GIT_COLOR_GREEN "\033[32m"
#define GIT_COLOR_YELLOW "\033[33m"
#define GIT_COLOR_BLUE "\033[34m"
+#define GIT_COLOR_MAGENTA "\033[35m"
#define GIT_COLOR_CYAN "\033[36m"
#define GIT_COLOR_BG_RED "\033[41m"
diff --git a/graph.c b/graph.c
index 162a516..0fcb61a 100644
--- a/graph.c
+++ b/graph.c
@@ -1,5 +1,6 @@
#include "cache.h"
#include "commit.h"
+#include "color.h"
#include "graph.h"
#include "diff.h"
#include "revision.h"
@@ -43,10 +44,6 @@ static void graph_show_strbuf(struct git_graph *graph, struct strbuf const *sb);
/*
* TODO:
- * - Add colors to the graph.
- * Pick a color for each column, and print all characters
- * in that column with the specified color.
- *
* - Limit the number of columns, similar to the way gitk does.
* If we reach more than a specified number of columns, omit
* sections of some columns.
@@ -72,9 +69,10 @@ struct column {
*/
struct commit *commit;
/*
- * XXX: Once we add support for colors, struct column could also
- * contain the color of its branch line.
+ * The color to (optionally) print this column in. This is an
+ * index into column_colors.
*/
+ unsigned short color;
};
enum graph_state {
@@ -86,6 +84,41 @@ enum graph_state {
GRAPH_COLLAPSING
};
+/*
+ * The list of available column colors.
+ */
+static char column_colors[][COLOR_MAXLEN] = {
+ GIT_COLOR_RED,
+ GIT_COLOR_GREEN,
+ GIT_COLOR_YELLOW,
+ GIT_COLOR_BLUE,
+ GIT_COLOR_MAGENTA,
+ GIT_COLOR_CYAN,
+ GIT_COLOR_BOLD GIT_COLOR_RED,
+ GIT_COLOR_BOLD GIT_COLOR_GREEN,
+ GIT_COLOR_BOLD GIT_COLOR_YELLOW,
+ GIT_COLOR_BOLD GIT_COLOR_BLUE,
+ GIT_COLOR_BOLD GIT_COLOR_MAGENTA,
+ GIT_COLOR_BOLD GIT_COLOR_CYAN,
+};
+
+#define COLUMN_COLORS_MAX (ARRAY_SIZE(column_colors))
+
+static const char *column_get_color_code(const struct column *c)
+{
+ return column_colors[c->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));
+ strbuf_addch(sb, col_char);
+ if (c->color < COLUMN_COLORS_MAX)
+ strbuf_addstr(sb, GIT_COLOR_RESET);
+}
+
struct git_graph {
/*
* The commit currently being processed
@@ -185,6 +218,11 @@ struct git_graph {
* temporary array each time we have to output a collapsing line.
*/
int *new_mapping;
+ /*
+ * The current default column color being used. This is
+ * stored as an index into the array column_colors.
+ */
+ unsigned short default_column_color;
};
struct git_graph *graph_init(struct rev_info *opt)
@@ -201,6 +239,7 @@ struct git_graph *graph_init(struct rev_info *opt)
graph->num_columns = 0;
graph->num_new_columns = 0;
graph->mapping_size = 0;
+ graph->default_column_color = 0;
/*
* Allocate a reasonably large default number of columns
@@ -312,6 +351,33 @@ static struct commit_list *first_interesting_parent(struct git_graph *graph)
return next_interesting_parent(graph, parents);
}
+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 graph->default_column_color;
+}
+
+/*
+ * Update the graph's default column color.
+ */
+static void graph_increment_column_color(struct git_graph *graph)
+{
+ graph->default_column_color = (graph->default_column_color + 1) %
+ COLUMN_COLORS_MAX;
+}
+
+static unsigned short graph_find_commit_color(const struct git_graph *graph,
+ const struct commit *commit)
+{
+ int i;
+ for (i = 0; i < graph->num_columns; i++) {
+ if (graph->columns[i].commit == commit)
+ return graph->columns[i].color;
+ }
+ return graph_get_current_column_color(graph);
+}
+
static void graph_insert_into_new_columns(struct git_graph *graph,
struct commit *commit,
int *mapping_index)
@@ -334,6 +400,7 @@ static void graph_insert_into_new_columns(struct git_graph *graph,
* This commit isn't already in new_columns. Add it.
*/
graph->new_columns[graph->num_new_columns].commit = commit;
+ graph->new_columns[graph->num_new_columns].color = graph_find_commit_color(graph, commit);
graph->mapping[*mapping_index] = graph->num_new_columns;
*mapping_index += 2;
graph->num_new_columns++;
@@ -445,6 +512,12 @@ static void graph_update_columns(struct git_graph *graph)
for (parent = first_interesting_parent(graph);
parent;
parent = next_interesting_parent(graph, parent)) {
+ /*
+ * If this is a merge increment the current
+ * color.
+ */
+ if (graph->num_parents > 1)
+ graph_increment_column_color(graph);
graph_insert_into_new_columns(graph,
parent->item,
&mapping_idx);
@@ -560,7 +633,8 @@ static int graph_is_mapping_correct(struct git_graph *graph)
return 1;
}
-static void graph_pad_horizontally(struct git_graph *graph, struct strbuf *sb)
+static void graph_pad_horizontally(struct git_graph *graph, struct strbuf *sb,
+ int chars_written)
{
/*
* Add additional spaces to the end of the strbuf, so that all
@@ -570,10 +644,10 @@ static void graph_pad_horizontally(struct git_graph *graph, struct strbuf *sb)
* aligned for the entire commit.
*/
int extra;
- if (sb->len >= graph->width)
+ if (chars_written >= graph->width)
return;
- extra = graph->width - sb->len;
+ extra = graph->width - chars_written;
strbuf_addf(sb, "%*s", (int) extra, "");
}
@@ -596,10 +670,11 @@ static void graph_output_padding_line(struct git_graph *graph,
* Output a padding row, that leaves all branch lines unchanged
*/
for (i = 0; i < graph->num_new_columns; i++) {
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, &graph->new_columns[i], '|');
+ strbuf_addch(sb, ' ');
}
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, graph->num_new_columns * 2);
}
static void graph_output_skip_line(struct git_graph *graph, struct strbuf *sb)
@@ -609,7 +684,7 @@ static void graph_output_skip_line(struct git_graph *graph, struct strbuf *sb)
* of the graph is missing.
*/
strbuf_addstr(sb, "...");
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, 3);
if (graph->num_parents >= 3 &&
graph->commit_index < (graph->num_columns - 1))
@@ -623,6 +698,7 @@ static void graph_output_pre_commit_line(struct git_graph *graph,
{
int num_expansion_rows;
int i, seen_this;
+ int chars_written;
/*
* This function formats a row that increases the space around a commit
@@ -645,11 +721,14 @@ static void graph_output_pre_commit_line(struct git_graph *graph,
* Output the row
*/
seen_this = 0;
+ chars_written = 0;
for (i = 0; i < graph->num_columns; i++) {
struct column *col = &graph->columns[i];
if (col->commit == graph->commit) {
seen_this = 1;
- strbuf_addf(sb, "| %*s", graph->expansion_row, "");
+ strbuf_write_column(sb, col, '|');
+ strbuf_addf(sb, " %*s", graph->expansion_row, "");
+ chars_written += 2 + graph->expansion_row;
} else if (seen_this && (graph->expansion_row == 0)) {
/*
* This is the first line of the pre-commit output.
@@ -662,17 +741,22 @@ static void graph_output_pre_commit_line(struct git_graph *graph,
*/
if (graph->prev_state == GRAPH_POST_MERGE &&
graph->prev_commit_index < i)
- strbuf_addstr(sb, "\\ ");
+ strbuf_write_column(sb, col, '\\');
else
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, col, '|');
+ chars_written++;
} else if (seen_this && (graph->expansion_row > 0)) {
- strbuf_addstr(sb, "\\ ");
+ strbuf_write_column(sb, col, '\\');
+ chars_written++;
} else {
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, col, '|');
+ chars_written++;
}
+ strbuf_addch(sb, ' ');
+ chars_written++;
}
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, chars_written);
/*
* Increment graph->expansion_row,
@@ -714,10 +798,34 @@ static void graph_output_commit_char(struct git_graph *graph, struct strbuf *sb)
strbuf_addch(sb, '*');
}
+/*
+ * Draw an octopus merge and return the number of characters written.
+ */
+static int graph_draw_octopus_merge(struct git_graph *graph,
+ struct strbuf *sb)
+{
+ /*
+ * Here dashless_commits represents the number of parents
+ * which don't need to have dashes (because their edges fit
+ * neatly under the commit).
+ */
+ const int dashless_commits = 2;
+ int col_num, i;
+ int num_dashes =
+ ((graph->num_parents - dashless_commits) * 2) - 1;
+ for (i = 0; i < num_dashes; i++) {
+ col_num = (i / 2) + dashless_commits;
+ strbuf_write_column(sb, &graph->new_columns[col_num], '-');
+ }
+ col_num = (i / 2) + dashless_commits;
+ strbuf_write_column(sb, &graph->new_columns[col_num], '.');
+ return num_dashes + 1;
+}
+
static void graph_output_commit_line(struct git_graph *graph, struct strbuf *sb)
{
int seen_this = 0;
- int i, j;
+ int i, chars_written;
/*
* Output the row containing this commit
@@ -727,7 +835,9 @@ static void graph_output_commit_line(struct git_graph *graph, struct strbuf *sb)
* children that we have already processed.)
*/
seen_this = 0;
+ chars_written = 0;
for (i = 0; i <= graph->num_columns; i++) {
+ struct column *col = &graph->columns[i];
struct commit *col_commit;
if (i == graph->num_columns) {
if (seen_this)
@@ -740,18 +850,14 @@ static void graph_output_commit_line(struct git_graph *graph, struct strbuf *sb)
if (col_commit == graph->commit) {
seen_this = 1;
graph_output_commit_char(graph, sb);
+ chars_written++;
- if (graph->num_parents < 3)
- strbuf_addch(sb, ' ');
- else {
- int num_dashes =
- ((graph->num_parents - 2) * 2) - 1;
- for (j = 0; j < num_dashes; j++)
- strbuf_addch(sb, '-');
- strbuf_addstr(sb, ". ");
- }
+ if (graph->num_parents > 3)
+ chars_written += graph_draw_octopus_merge(graph,
+ sb);
} else if (seen_this && (graph->num_parents > 2)) {
- strbuf_addstr(sb, "\\ ");
+ strbuf_write_column(sb, col, '\\');
+ chars_written++;
} else if (seen_this && (graph->num_parents == 2)) {
/*
* This is a 2-way merge commit.
@@ -768,15 +874,19 @@ static void graph_output_commit_line(struct git_graph *graph, struct strbuf *sb)
*/
if (graph->prev_state == GRAPH_POST_MERGE &&
graph->prev_commit_index < i)
- strbuf_addstr(sb, "\\ ");
+ strbuf_write_column(sb, col, '\\');
else
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, col, '|');
+ chars_written++;
} else {
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, col, '|');
+ chars_written++;
}
+ strbuf_addch(sb, ' ');
+ chars_written++;
}
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, chars_written);
/*
* Update graph->state
@@ -789,37 +899,75 @@ static void graph_output_commit_line(struct git_graph *graph, struct strbuf *sb)
graph_update_state(graph, GRAPH_COLLAPSING);
}
+static struct column *find_new_column_by_commit(struct git_graph *graph,
+ struct commit *commit)
+{
+ int i;
+ for (i = 0; i < graph->num_new_columns; i++) {
+ if (graph->new_columns[i].commit == commit)
+ return &graph->new_columns[i];
+ }
+ return 0;
+}
+
static void graph_output_post_merge_line(struct git_graph *graph, struct strbuf *sb)
{
int seen_this = 0;
- int i, j;
+ int i, j, chars_written;
/*
* Output the post-merge row
*/
+ chars_written = 0;
for (i = 0; i <= graph->num_columns; i++) {
+ struct column *col = &graph->columns[i];
struct commit *col_commit;
if (i == graph->num_columns) {
if (seen_this)
break;
col_commit = graph->commit;
} else {
- col_commit = graph->columns[i].commit;
+ col_commit = col->commit;
}
if (col_commit == graph->commit) {
+ /*
+ * Since the current commit is a merge find
+ * the columns for the parent commits in
+ * new_columns and use those to format the
+ * edges.
+ */
+ struct commit_list *parents = NULL;
+ struct column *par_column;
seen_this = 1;
- strbuf_addch(sb, '|');
- for (j = 0; j < graph->num_parents - 1; j++)
- strbuf_addstr(sb, "\\ ");
+ parents = first_interesting_parent(graph);
+ assert(parents);
+ par_column = find_new_column_by_commit(graph,parents->item);
+ assert(par_column);
+
+ strbuf_write_column(sb, par_column, '|');
+ chars_written++;
+ for (j = 0; j < graph->num_parents - 1; j++) {
+ parents = next_interesting_parent(graph, parents);
+ assert(parents);
+ par_column = find_new_column_by_commit(graph,parents->item);
+ assert(par_column);
+ strbuf_write_column(sb, par_column, '\\');
+ strbuf_addch(sb, ' ');
+ }
+ chars_written += j * 2;
} else if (seen_this) {
- strbuf_addstr(sb, "\\ ");
+ strbuf_write_column(sb, col, '\\');
+ strbuf_addch(sb, ' ');
+ chars_written += 2;
} else {
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, col, '|');
+ strbuf_addch(sb, ' ');
+ chars_written += 2;
}
}
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, chars_written);
/*
* Update graph->state
@@ -912,12 +1060,12 @@ static void graph_output_collapsing_line(struct git_graph *graph, struct strbuf
if (target < 0)
strbuf_addch(sb, ' ');
else if (target * 2 == i)
- strbuf_addch(sb, '|');
+ strbuf_write_column(sb, &graph->new_columns[target], '|');
else
- strbuf_addch(sb, '/');
+ strbuf_write_column(sb, &graph->new_columns[target], '/');
}
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, graph->mapping_size);
/*
* Swap mapping and new_mapping
@@ -979,9 +1127,10 @@ static void graph_padding_line(struct git_graph *graph, struct strbuf *sb)
* children that we have already processed.)
*/
for (i = 0; i < graph->num_columns; i++) {
- struct commit *col_commit = graph->columns[i].commit;
+ struct column *col = &graph->columns[i];
+ struct commit *col_commit = col->commit;
if (col_commit == graph->commit) {
- strbuf_addch(sb, '|');
+ strbuf_write_column(sb, col, '|');
if (graph->num_parents < 3)
strbuf_addch(sb, ' ');
@@ -991,11 +1140,12 @@ static void graph_padding_line(struct git_graph *graph, struct strbuf *sb)
strbuf_addch(sb, ' ');
}
} else {
- strbuf_addstr(sb, "| ");
+ strbuf_write_column(sb, col, '|');
+ strbuf_addch(sb, ' ');
}
}
- graph_pad_horizontally(graph, sb);
+ graph_pad_horizontally(graph, sb, graph->num_columns);
/*
* Update graph->prev_state since we have output a padding line
--
1.5.6.3
--
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