git/graph.c

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34 KiB
C
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#include "cache.h"
#include "commit.h"
#include "color.h"
#include "graph.h"
#include "diff.h"
#include "revision.h"
/* Internal API */
/*
* Output a padding line in the graph.
* This is similar to graph_next_line(). However, it is guaranteed to
* never print the current commit line. Instead, if the commit line is
* next, it will simply output a line of vertical padding, extending the
* branch lines downwards, but leaving them otherwise unchanged.
*/
static void graph_padding_line(struct git_graph *graph, struct strbuf *sb);
/*
* Print a strbuf to stdout. If the graph is non-NULL, all lines but the
* first will be prefixed with the graph output.
*
* If the strbuf ends with a newline, the output will end after this
* newline. A new graph line will not be printed after the final newline.
* If the strbuf is empty, no output will be printed.
*
* Since the first line will not include the graph output, the caller is
* responsible for printing this line's graph (perhaps via
* graph_show_commit() or graph_show_oneline()) before calling
* graph_show_strbuf().
*/
static void graph_show_strbuf(struct git_graph *graph, struct strbuf const *sb);
/*
* TODO:
* - 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.
*/
struct column {
/*
* The parent commit of this column.
*/
struct commit *commit;
/*
* The color to (optionally) print this column in. This is an
* index into column_colors.
*/
unsigned short color;
};
enum graph_state {
GRAPH_PADDING,
GRAPH_SKIP,
GRAPH_PRE_COMMIT,
GRAPH_COMMIT,
GRAPH_POST_MERGE,
GRAPH_COLLAPSING
};
static const char **column_colors;
static unsigned short column_colors_max;
void graph_set_column_colors(const char **colors, unsigned short colors_max)
{
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->color));
strbuf_addch(sb, col_char);
if (c->color < column_colors_max)
strbuf_addstr(sb, column_get_color_code(column_colors_max));
}
struct git_graph {
/*
* The commit currently being processed
*/
struct commit *commit;
/* The rev-info used for the current traversal */
struct rev_info *revs;
/*
* The number of interesting parents that this commit has.
*
* Note that this is not the same as the actual number of parents.
* This count excludes parents that won't be printed in the graph
* output, as determined by graph_is_interesting().
*/
int num_parents;
/*
* The width of the graph output for this commit.
* All rows for this commit are padded to this width, so that
* messages printed after the graph output are aligned.
*/
int width;
/*
* The next expansion row to print
* when state is GRAPH_PRE_COMMIT
*/
int expansion_row;
/*
* The current output state.
* This tells us what kind of line graph_next_line() should output.
*/
enum graph_state state;
/*
* The output state for the previous line of output.
* This is primarily used to determine how the first merge line
* should appear, based on the last line of the previous commit.
*/
enum graph_state prev_state;
/*
* The index of the column that refers to this commit.
*
* If none of the incoming columns refer to this commit,
* this will be equal to num_columns.
*/
int commit_index;
/*
* The commit_index for the previously displayed commit.
*
* This is used to determine how the first line of a merge
* graph output should appear, based on the last line of the
* previous commit.
*/
int prev_commit_index;
/*
* The maximum number of columns that can be stored in the columns
* and new_columns arrays. This is also half the number of entries
* that can be stored in the mapping and new_mapping arrays.
*/
int column_capacity;
/*
* The number of columns (also called "branch lines" in some places)
*/
int num_columns;
/*
* The number of columns in the new_columns array
*/
int num_new_columns;
/*
* The number of entries in the mapping array
*/
int mapping_size;
/*
* The column state before we output the current commit.
*/
struct column *columns;
/*
* The new column state after we output the current commit.
* Only valid when state is GRAPH_COLLAPSING.
*/
struct column *new_columns;
/*
* An array that tracks the current state of each
* character in the output line during state GRAPH_COLLAPSING.
* Each entry is -1 if this character is empty, or a non-negative
* integer if the character contains a branch line. The value of
* the integer indicates the target position for this branch line.
* (I.e., this array maps the current column positions to their
* desired positions.)
*
* The maximum capacity of this array is always
* sizeof(int) * 2 * column_capacity.
*/
int *mapping;
/*
* A temporary array for computing the next mapping state
* while we are outputting a mapping line. This is stored as part
* of the git_graph simply so we don't have to allocate a new
* 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;
};
static struct strbuf *diff_output_prefix_callback(struct diff_options *opt, void *data)
{
struct git_graph *graph = data;
static struct strbuf msgbuf = STRBUF_INIT;
assert(opt);
assert(graph);
opt->output_prefix_length = graph->width;
strbuf_reset(&msgbuf);
graph_padding_line(graph, &msgbuf);
return &msgbuf;
}
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;
graph->expansion_row = 0;
graph->state = GRAPH_PADDING;
graph->prev_state = GRAPH_PADDING;
graph->commit_index = 0;
graph->prev_commit_index = 0;
graph->num_columns = 0;
graph->num_new_columns = 0;
graph->mapping_size = 0;
/*
* Start the column color at the maximum value, since we'll
* 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;
/*
* Allocate a reasonably large default number of columns
* We'll automatically grow columns later if we need more room.
*/
graph->column_capacity = 30;
graph->columns = xmalloc(sizeof(struct column) *
graph->column_capacity);
graph->new_columns = xmalloc(sizeof(struct column) *
graph->column_capacity);
graph->mapping = xmalloc(sizeof(int) * 2 * graph->column_capacity);
graph->new_mapping = xmalloc(sizeof(int) * 2 * graph->column_capacity);
/*
* The diff output prefix callback, with this we can make
* all the diff output to align with the graph lines.
*/
opt->diffopt.output_prefix = diff_output_prefix_callback;
opt->diffopt.output_prefix_data = graph;
opt->diffopt.output_prefix_length = 0;
return graph;
}
static void graph_update_state(struct git_graph *graph, enum graph_state s)
{
graph->prev_state = graph->state;
graph->state = s;
}
static void graph_ensure_capacity(struct git_graph *graph, int num_columns)
{
if (graph->column_capacity >= num_columns)
return;
do {
graph->column_capacity *= 2;
} while (graph->column_capacity < num_columns);
REALLOC_ARRAY(graph->columns, graph->column_capacity);
REALLOC_ARRAY(graph->new_columns, graph->column_capacity);
REALLOC_ARRAY(graph->mapping, graph->column_capacity * 2);
REALLOC_ARRAY(graph->new_mapping, graph->column_capacity * 2);
}
/*
* Returns 1 if the commit will be printed in the graph output,
* and 0 otherwise.
*/
static int graph_is_interesting(struct git_graph *graph, struct commit *commit)
{
/*
* If revs->boundary is set, commits whose children have
* been shown are always interesting, even if they have the
* UNINTERESTING or TREESAME flags set.
*/
if (graph->revs && graph->revs->boundary) {
if (commit->object.flags & CHILD_SHOWN)
return 1;
}
/*
* Otherwise, use get_commit_action() to see if this commit is
* interesting
*/
return get_commit_action(graph->revs, commit) == commit_show;
}
static struct commit_list *next_interesting_parent(struct git_graph *graph,
struct commit_list *orig)
{
struct commit_list *list;
/*
* If revs->first_parent_only is set, only the first
* parent is interesting. None of the others are.
*/
if (graph->revs->first_parent_only)
return NULL;
/*
* Return the next interesting commit after orig
*/
for (list = orig->next; list; list = list->next) {
if (graph_is_interesting(graph, list->item))
return list;
}
return NULL;
}
static struct commit_list *first_interesting_parent(struct git_graph *graph)
{
struct commit_list *parents = graph->commit->parents;
/*
* If this commit has no parents, ignore it
*/
if (!parents)
return NULL;
/*
* If the first parent is interesting, return it
*/
if (graph_is_interesting(graph, parents->item))
return parents;
/*
* Otherwise, call next_interesting_parent() to get
* the next interesting parent
*/
return next_interesting_parent(graph, parents);
}
static unsigned short graph_get_current_column_color(const struct git_graph *graph)
{
color: delay auto-color decision until point of use When we read a color value either from a config file or from the command line, we use git_config_colorbool to convert it from the tristate always/never/auto into a single yes/no boolean value. This has some timing implications with respect to starting a pager. If we start (or decide not to start) the pager before checking the colorbool, everything is fine. Either isatty(1) will give us the right information, or we will properly check for pager_in_use(). However, if we decide to start a pager after we have checked the colorbool, things are not so simple. If stdout is a tty, then we will have already decided to use color. However, the user may also have configured color.pager not to use color with the pager. In this case, we need to actually turn off color. Unfortunately, the pager code has no idea which color variables were turned on (and there are many of them throughout the code, and they may even have been manipulated after the colorbool selection by something like "--color" on the command line). This bug can be seen any time a pager is started after config and command line options are checked. This has affected "git diff" since 89d07f7 (diff: don't run pager if user asked for a diff style exit code, 2007-08-12). It has also affect the log family since 1fda91b (Fix 'git log' early pager startup error case, 2010-08-24). This patch splits the notion of parsing a colorbool and actually checking the configuration. The "use_color" variables now have an additional possible value, GIT_COLOR_AUTO. Users of the variable should use the new "want_color()" wrapper, which will lazily determine and cache the auto-color decision. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-18 09:04:23 +04:00
if (!want_color(graph->revs->diffopt.use_color))
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)
{
int i;
/*
* If the commit is already in the new_columns list, we don't need to
* add it. Just update the mapping correctly.
*/
for (i = 0; i < graph->num_new_columns; i++) {
if (graph->new_columns[i].commit == commit) {
graph->mapping[*mapping_index] = i;
*mapping_index += 2;
return;
}
}
/*
* 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++;
}
static void graph_update_width(struct git_graph *graph,
int is_commit_in_existing_columns)
{
/*
* Compute the width needed to display the graph for this commit.
* This is the maximum width needed for any row. All other rows
* will be padded to this width.
*
* Compute the number of columns in the widest row:
* Count each existing column (graph->num_columns), and each new
* column added by this commit.
*/
int max_cols = graph->num_columns + graph->num_parents;
/*
* Even if the current commit has no parents to be printed, it
* still takes up a column for itself.
*/
if (graph->num_parents < 1)
max_cols++;
/*
* We added a column for the current commit as part of
* graph->num_parents. If the current commit was already in
* graph->columns, then we have double counted it.
*/
if (is_commit_in_existing_columns)
max_cols--;
/*
* Each column takes up 2 spaces
*/
graph->width = max_cols * 2;
}
static void graph_update_columns(struct git_graph *graph)
{
struct commit_list *parent;
struct column *tmp_columns;
int max_new_columns;
int mapping_idx;
int i, seen_this, is_commit_in_columns;
/*
* Swap graph->columns with graph->new_columns
* graph->columns contains the state for the previous commit,
* and new_columns now contains the state for our commit.
*
* We'll re-use the old columns array as storage to compute the new
* columns list for the commit after this one.
*/
tmp_columns = graph->columns;
graph->columns = graph->new_columns;
graph->num_columns = graph->num_new_columns;
graph->new_columns = tmp_columns;
graph->num_new_columns = 0;
/*
* Now update new_columns and mapping with the information for the
* commit after this one.
*
* First, make sure we have enough room. At most, there will
* be graph->num_columns + graph->num_parents columns for the next
* commit.
*/
max_new_columns = graph->num_columns + graph->num_parents;
graph_ensure_capacity(graph, max_new_columns);
/*
* Clear out graph->mapping
*/
graph->mapping_size = 2 * max_new_columns;
for (i = 0; i < graph->mapping_size; i++)
graph->mapping[i] = -1;
/*
* Populate graph->new_columns and graph->mapping
*
* Some of the parents of this commit may already be in
* graph->columns. If so, graph->new_columns should only contain a
* single entry for each such commit. graph->mapping should
* contain information about where each current branch line is
* supposed to end up after the collapsing is performed.
*/
seen_this = 0;
mapping_idx = 0;
is_commit_in_columns = 1;
for (i = 0; i <= graph->num_columns; i++) {
struct commit *col_commit;
if (i == graph->num_columns) {
if (seen_this)
break;
is_commit_in_columns = 0;
col_commit = graph->commit;
} else {
col_commit = graph->columns[i].commit;
}
if (col_commit == graph->commit) {
int old_mapping_idx = mapping_idx;
seen_this = 1;
graph->commit_index = i;
for (parent = first_interesting_parent(graph);
parent;
parent = next_interesting_parent(graph, parent)) {
/*
* If this is a merge, or the start of a new
* childless column, increment the current
* color.
*/
if (graph->num_parents > 1 ||
!is_commit_in_columns) {
graph_increment_column_color(graph);
}
graph_insert_into_new_columns(graph,
parent->item,
&mapping_idx);
}
/*
* We always need to increment mapping_idx by at
* least 2, even if it has no interesting parents.
* The current commit always takes up at least 2
* spaces.
*/
if (mapping_idx == old_mapping_idx)
mapping_idx += 2;
} else {
graph_insert_into_new_columns(graph, col_commit,
&mapping_idx);
}
}
/*
* Shrink mapping_size to be the minimum necessary
*/
while (graph->mapping_size > 1 &&
graph->mapping[graph->mapping_size - 1] < 0)
graph->mapping_size--;
/*
* Compute graph->width for this commit
*/
graph_update_width(graph, is_commit_in_columns);
}
void graph_update(struct git_graph *graph, struct commit *commit)
{
struct commit_list *parent;
/*
* Set the new commit
*/
graph->commit = commit;
/*
* Count how many interesting parents this commit has
*/
graph->num_parents = 0;
for (parent = first_interesting_parent(graph);
parent;
parent = next_interesting_parent(graph, parent))
{
graph->num_parents++;
}
/*
* Store the old commit_index in prev_commit_index.
* graph_update_columns() will update graph->commit_index for this
* commit.
*/
graph->prev_commit_index = graph->commit_index;
/*
* Call graph_update_columns() to update
* columns, new_columns, and mapping.
*/
graph_update_columns(graph);
graph->expansion_row = 0;
/*
* Update graph->state.
* Note that we don't call graph_update_state() here, since
* we don't want to update graph->prev_state. No line for
* graph->state was ever printed.
*
* If the previous commit didn't get to the GRAPH_PADDING state,
* it never finished its output. Goto GRAPH_SKIP, to print out
* a line to indicate that portion of the graph is missing.
*
* If there are 3 or more parents, we may need to print extra rows
* before the commit, to expand the branch lines around it and make
* room for it. We need to do this only if there is a branch row
* (or more) to the right of this commit.
*
* If there are less than 3 parents, we can immediately print the
* commit line.
*/
if (graph->state != GRAPH_PADDING)
graph->state = GRAPH_SKIP;
else if (graph->num_parents >= 3 &&
graph->commit_index < (graph->num_columns - 1))
graph->state = GRAPH_PRE_COMMIT;
else
graph->state = GRAPH_COMMIT;
}
static int graph_is_mapping_correct(struct git_graph *graph)
{
int i;
/*
* The mapping is up to date if each entry is at its target,
* or is 1 greater than its target.
* (If it is 1 greater than the target, '/' will be printed, so it
* will look correct on the next row.)
*/
for (i = 0; i < graph->mapping_size; i++) {
int target = graph->mapping[i];
if (target < 0)
continue;
if (target == (i / 2))
continue;
return 0;
}
return 1;
}
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
* lines for a particular commit have the same width.
*
* This way, fields printed to the right of the graph will remain
* aligned for the entire commit.
*/
int extra;
if (chars_written >= graph->width)
return;
extra = graph->width - chars_written;
strbuf_addf(sb, "%*s", (int) extra, "");
}
static void graph_output_padding_line(struct git_graph *graph,
struct strbuf *sb)
{
int i;
/*
* We could conceivable be called with a NULL commit
* if our caller has a bug, and invokes graph_next_line()
* immediately after graph_init(), without first calling
* graph_update(). Return without outputting anything in this
* case.
*/
if (!graph->commit)
return;
/*
* Output a padding row, that leaves all branch lines unchanged
*/
for (i = 0; i < graph->num_new_columns; i++) {
strbuf_write_column(sb, &graph->new_columns[i], '|');
strbuf_addch(sb, ' ');
}
graph_pad_horizontally(graph, sb, graph->num_new_columns * 2);
}
static void graph_output_skip_line(struct git_graph *graph, struct strbuf *sb)
{
/*
* Output an ellipsis to indicate that a portion
* of the graph is missing.
*/
strbuf_addstr(sb, "...");
graph_pad_horizontally(graph, sb, 3);
if (graph->num_parents >= 3 &&
graph->commit_index < (graph->num_columns - 1))
graph_update_state(graph, GRAPH_PRE_COMMIT);
else
graph_update_state(graph, GRAPH_COMMIT);
}
static void graph_output_pre_commit_line(struct git_graph *graph,
struct strbuf *sb)
{
int num_expansion_rows;
int i, seen_this;
int chars_written;
/*
* This function formats a row that increases the space around a commit
* with multiple parents, to make room for it. It should only be
* called when there are 3 or more parents.
*
* We need 2 extra rows for every parent over 2.
*/
assert(graph->num_parents >= 3);
num_expansion_rows = (graph->num_parents - 2) * 2;
/*
* graph->expansion_row tracks the current expansion row we are on.
* It should be in the range [0, num_expansion_rows - 1]
*/
assert(0 <= graph->expansion_row &&
graph->expansion_row < num_expansion_rows);
/*
* 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_write_column(sb, col, '|');
strbuf_addf(sb, "%*s", graph->expansion_row, "");
chars_written += 1 + graph->expansion_row;
} else if (seen_this && (graph->expansion_row == 0)) {
/*
* This is the first line of the pre-commit output.
* If the previous commit was a merge commit and
* ended in the GRAPH_POST_MERGE state, all branch
* lines after graph->prev_commit_index were
* printed as "\" on the previous line. Continue
* to print them as "\" on this line. Otherwise,
* print the branch lines as "|".
*/
if (graph->prev_state == GRAPH_POST_MERGE &&
graph->prev_commit_index < i)
strbuf_write_column(sb, col, '\\');
else
strbuf_write_column(sb, col, '|');
chars_written++;
} else if (seen_this && (graph->expansion_row > 0)) {
strbuf_write_column(sb, col, '\\');
chars_written++;
} else {
strbuf_write_column(sb, col, '|');
chars_written++;
}
strbuf_addch(sb, ' ');
chars_written++;
}
graph_pad_horizontally(graph, sb, chars_written);
/*
* Increment graph->expansion_row,
* and move to state GRAPH_COMMIT if necessary
*/
graph->expansion_row++;
if (graph->expansion_row >= num_expansion_rows)
graph_update_state(graph, GRAPH_COMMIT);
}
static void graph_output_commit_char(struct git_graph *graph, struct strbuf *sb)
{
/*
* For boundary commits, print 'o'
* (We should only see boundary commits when revs->boundary is set.)
*/
if (graph->commit->object.flags & BOUNDARY) {
assert(graph->revs->boundary);
strbuf_addch(sb, 'o');
return;
}
/*
* get_revision_mark() handles all other cases without assert()
*/
strbuf_addstr(sb, get_revision_mark(graph->revs, graph->commit));
}
/*
* 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 + graph->commit_index;
strbuf_write_column(sb, &graph->new_columns[col_num], '-');
}
col_num = (i / 2) + dashless_commits + graph->commit_index;
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, chars_written;
/*
* Output the row containing this commit
* Iterate up to and including graph->num_columns,
* since the current commit may not be in any of the existing
* columns. (This happens when the current commit doesn't have any
* 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)
break;
col_commit = graph->commit;
} else {
col_commit = graph->columns[i].commit;
}
if (col_commit == graph->commit) {
seen_this = 1;
graph_output_commit_char(graph, sb);
chars_written++;
if (graph->num_parents > 2)
chars_written += graph_draw_octopus_merge(graph,
sb);
} else if (seen_this && (graph->num_parents > 2)) {
strbuf_write_column(sb, col, '\\');
chars_written++;
} else if (seen_this && (graph->num_parents == 2)) {
/*
* This is a 2-way merge commit.
* There is no GRAPH_PRE_COMMIT stage for 2-way
* merges, so this is the first line of output
* for this commit. Check to see what the previous
* line of output was.
*
* If it was GRAPH_POST_MERGE, the branch line
* coming into this commit may have been '\',
* and not '|' or '/'. If so, output the branch
* line as '\' on this line, instead of '|'. This
* makes the output look nicer.
*/
if (graph->prev_state == GRAPH_POST_MERGE &&
graph->prev_commit_index < i)
strbuf_write_column(sb, col, '\\');
else
strbuf_write_column(sb, col, '|');
chars_written++;
} else {
strbuf_write_column(sb, col, '|');
chars_written++;
}
strbuf_addch(sb, ' ');
chars_written++;
}
graph_pad_horizontally(graph, sb, chars_written);
/*
* Update graph->state
*/
if (graph->num_parents > 1)
graph_update_state(graph, GRAPH_POST_MERGE);
else if (graph_is_mapping_correct(graph))
graph_update_state(graph, GRAPH_PADDING);
else
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 NULL;
}
static void graph_output_post_merge_line(struct git_graph *graph, struct strbuf *sb)
{
int seen_this = 0;
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 = 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;
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_write_column(sb, col, '\\');
strbuf_addch(sb, ' ');
chars_written += 2;
} else {
strbuf_write_column(sb, col, '|');
strbuf_addch(sb, ' ');
chars_written += 2;
}
}
graph_pad_horizontally(graph, sb, chars_written);
/*
* Update graph->state
*/
if (graph_is_mapping_correct(graph))
graph_update_state(graph, GRAPH_PADDING);
else
graph_update_state(graph, GRAPH_COLLAPSING);
}
static void graph_output_collapsing_line(struct git_graph *graph, struct strbuf *sb)
{
int i;
int *tmp_mapping;
short used_horizontal = 0;
int horizontal_edge = -1;
int horizontal_edge_target = -1;
/*
* Clear out the new_mapping array
*/
for (i = 0; i < graph->mapping_size; i++)
graph->new_mapping[i] = -1;
for (i = 0; i < graph->mapping_size; i++) {
int target = graph->mapping[i];
if (target < 0)
continue;
/*
* Since update_columns() always inserts the leftmost
* column first, each branch's target location should
* always be either its current location or to the left of
* its current location.
*
* We never have to move branches to the right. This makes
* the graph much more legible, since whenever branches
* cross, only one is moving directions.
*/
assert(target * 2 <= i);
if (target * 2 == i) {
/*
* This column is already in the
* correct place
*/
assert(graph->new_mapping[i] == -1);
graph->new_mapping[i] = target;
} else if (graph->new_mapping[i - 1] < 0) {
/*
* Nothing is to the left.
* Move to the left by one
*/
graph->new_mapping[i - 1] = target;
/*
* If there isn't already an edge moving horizontally
* select this one.
*/
if (horizontal_edge == -1) {
int j;
horizontal_edge = i;
horizontal_edge_target = target;
/*
* The variable target is the index of the graph
* column, and therefore target*2+3 is the
* actual screen column of the first horizontal
* line.
*/
for (j = (target * 2)+3; j < (i - 2); j += 2)
graph->new_mapping[j] = target;
}
} else if (graph->new_mapping[i - 1] == target) {
/*
* There is a branch line to our left
* already, and it is our target. We
* combine with this line, since we share
* the same parent commit.
*
* We don't have to add anything to the
* output or new_mapping, since the
* existing branch line has already taken
* care of it.
*/
} else {
/*
* There is a branch line to our left,
* but it isn't our target. We need to
* cross over it.
*
* The space just to the left of this
* branch should always be empty.
*
* The branch to the left of that space
* should be our eventual target.
*/
assert(graph->new_mapping[i - 1] > target);
assert(graph->new_mapping[i - 2] < 0);
assert(graph->new_mapping[i - 3] == target);
graph->new_mapping[i - 2] = target;
/*
* Mark this branch as the horizontal edge to
* prevent any other edges from moving
* horizontally.
*/
if (horizontal_edge == -1)
horizontal_edge = i;
}
}
/*
* The new mapping may be 1 smaller than the old mapping
*/
if (graph->new_mapping[graph->mapping_size - 1] < 0)
graph->mapping_size--;
/*
* Output out a line based on the new mapping info
*/
for (i = 0; i < graph->mapping_size; i++) {
int target = graph->new_mapping[i];
if (target < 0)
strbuf_addch(sb, ' ');
else if (target * 2 == i)
strbuf_write_column(sb, &graph->new_columns[target], '|');
else if (target == horizontal_edge_target &&
i != horizontal_edge - 1) {
/*
* Set the mappings for all but the
* first segment to -1 so that they
* won't continue into the next line.
*/
if (i != (target * 2)+3)
graph->new_mapping[i] = -1;
used_horizontal = 1;
strbuf_write_column(sb, &graph->new_columns[target], '_');
} else {
if (used_horizontal && i < horizontal_edge)
graph->new_mapping[i] = -1;
strbuf_write_column(sb, &graph->new_columns[target], '/');
}
}
graph_pad_horizontally(graph, sb, graph->mapping_size);
/*
* Swap mapping and new_mapping
*/
tmp_mapping = graph->mapping;
graph->mapping = graph->new_mapping;
graph->new_mapping = tmp_mapping;
/*
* If graph->mapping indicates that all of the branch lines
* are already in the correct positions, we are done.
* Otherwise, we need to collapse some branch lines together.
*/
if (graph_is_mapping_correct(graph))
graph_update_state(graph, GRAPH_PADDING);
}
int graph_next_line(struct git_graph *graph, struct strbuf *sb)
{
switch (graph->state) {
case GRAPH_PADDING:
graph_output_padding_line(graph, sb);
return 0;
case GRAPH_SKIP:
graph_output_skip_line(graph, sb);
return 0;
case GRAPH_PRE_COMMIT:
graph_output_pre_commit_line(graph, sb);
return 0;
case GRAPH_COMMIT:
graph_output_commit_line(graph, sb);
return 1;
case GRAPH_POST_MERGE:
graph_output_post_merge_line(graph, sb);
return 0;
case GRAPH_COLLAPSING:
graph_output_collapsing_line(graph, sb);
return 0;
}
assert(0);
return 0;
}
static void graph_padding_line(struct git_graph *graph, struct strbuf *sb)
{
int i;
if (graph->state != GRAPH_COMMIT) {
graph_next_line(graph, sb);
return;
}
/*
* Output the row containing this commit
* Iterate up to and including graph->num_columns,
* since the current commit may not be in any of the existing
* columns. (This happens when the current commit doesn't have any
* children that we have already processed.)
*/
for (i = 0; i < graph->num_columns; i++) {
struct column *col = &graph->columns[i];
strbuf_write_column(sb, col, '|');
if (col->commit == graph->commit && graph->num_parents > 2)
strbuf_addchars(sb, ' ', (graph->num_parents - 2) * 2);
else
strbuf_addch(sb, ' ');
}
graph_pad_horizontally(graph, sb, graph->num_columns);
/*
* Update graph->prev_state since we have output a padding line
*/
graph->prev_state = GRAPH_PADDING;
}
int graph_is_commit_finished(struct git_graph const *graph)
{
return (graph->state == GRAPH_PADDING);
}
void graph_show_commit(struct git_graph *graph)
{
struct strbuf msgbuf = STRBUF_INIT;
int shown_commit_line = 0;
if (!graph)
return;
/*
* When showing a diff of a merge against each of its parents, we
* are called once for each parent without graph_update having been
* called. In this case, simply output a single padding line.
*/
if (graph_is_commit_finished(graph)) {
graph_show_padding(graph);
shown_commit_line = 1;
}
while (!shown_commit_line && !graph_is_commit_finished(graph)) {
shown_commit_line = graph_next_line(graph, &msgbuf);
fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
if (!shown_commit_line)
putchar('\n');
strbuf_setlen(&msgbuf, 0);
}
strbuf_release(&msgbuf);
}
void graph_show_oneline(struct git_graph *graph)
{
struct strbuf msgbuf = STRBUF_INIT;
if (!graph)
return;
graph_next_line(graph, &msgbuf);
fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
strbuf_release(&msgbuf);
}
void graph_show_padding(struct git_graph *graph)
{
struct strbuf msgbuf = STRBUF_INIT;
if (!graph)
return;
graph_padding_line(graph, &msgbuf);
fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
strbuf_release(&msgbuf);
}
int graph_show_remainder(struct git_graph *graph)
{
struct strbuf msgbuf = STRBUF_INIT;
int shown = 0;
if (!graph)
return 0;
if (graph_is_commit_finished(graph))
return 0;
for (;;) {
graph_next_line(graph, &msgbuf);
fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
strbuf_setlen(&msgbuf, 0);
shown = 1;
if (!graph_is_commit_finished(graph))
putchar('\n');
else
break;
}
strbuf_release(&msgbuf);
return shown;
}
static void graph_show_strbuf(struct git_graph *graph, struct strbuf const *sb)
{
char *p;
if (!graph) {
fwrite(sb->buf, sizeof(char), sb->len, stdout);
return;
}
/*
* Print the strbuf line by line,
* and display the graph info before each line but the first.
*/
p = sb->buf;
while (p) {
size_t len;
char *next_p = strchr(p, '\n');
if (next_p) {
next_p++;
len = next_p - p;
} else {
len = (sb->buf + sb->len) - p;
}
fwrite(p, sizeof(char), len, stdout);
if (next_p && *next_p != '\0')
graph_show_oneline(graph);
p = next_p;
}
}
void graph_show_commit_msg(struct git_graph *graph,
struct strbuf const *sb)
{
int newline_terminated;
if (!graph) {
/*
* If there's no graph, just print the message buffer.
*
* The message buffer for CMIT_FMT_ONELINE and
* CMIT_FMT_USERFORMAT are already missing a terminating
* newline. All of the other formats should have it.
*/
fwrite(sb->buf, sizeof(char), sb->len, stdout);
return;
}
newline_terminated = (sb->len && sb->buf[sb->len - 1] == '\n');
/*
* Show the commit message
*/
graph_show_strbuf(graph, sb);
/*
* If there is more output needed for this commit, show it now
*/
if (!graph_is_commit_finished(graph)) {
/*
* If sb doesn't have a terminating newline, print one now,
* so we can start the remainder of the graph output on a
* new line.
*/
if (!newline_terminated)
putchar('\n');
graph_show_remainder(graph);
/*
* If sb ends with a newline, our output should too.
*/
if (newline_terminated)
putchar('\n');
}
}