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tag: v1.8.0.1
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#include "cache.h"
#include "column.h"
#include "string-list.h"
#include "parse-options.h"
#include "run-command.h"
#include "utf8.h"

#define XY2LINEAR(d, x, y) (COL_LAYOUT((d)->colopts) == COL_COLUMN ? \
(x) * (d)->rows + (y) : \
(y) * (d)->cols + (x))

struct column_data {
const struct string_list *list;
unsigned int colopts;
struct column_options opts;

int rows, cols;
int *len; /* cell length */
int *width; /* index to the longest row in column */
};

/* return length of 's' in letters, ANSI escapes stripped */
static int item_length(unsigned int colopts, const char *s)
{
int len, i = 0;
struct strbuf str = STRBUF_INIT;

strbuf_addstr(&str, s);
while ((s = strstr(str.buf + i, "\033[")) != NULL) {
int len = strspn(s + 2, "0123456789;");
i = s - str.buf;
strbuf_remove(&str, i, len + 3); /* \033[<len><func char> */
}
len = utf8_strwidth(str.buf);
strbuf_release(&str);
return len;
}

/*
* Calculate cell width, rows and cols for a table of equal cells, given
* table width and how many spaces between cells.
*/
static void layout(struct column_data *data, int *width)
{
int i;

*width = 0;
for (i = 0; i < data->list->nr; i++)
if (*width < data->len[i])
*width = data->len[i];

*width += data->opts.padding;

data->cols = (data->opts.width - strlen(data->opts.indent)) / *width;
if (data->cols == 0)
data->cols = 1;

data->rows = DIV_ROUND_UP(data->list->nr, data->cols);
}

static void compute_column_width(struct column_data *data)
{
int i, x, y;
for (x = 0; x < data->cols; x++) {
data->width[x] = XY2LINEAR(data, x, 0);
for (y = 0; y < data->rows; y++) {
i = XY2LINEAR(data, x, y);
if (i < data->list->nr &&
data->len[data->width[x]] < data->len[i])
data->width[x] = i;
}
}
}

/*
* Shrink all columns by shortening them one row each time (and adding
* more columns along the way). Hopefully the longest cell will be
* moved to the next column, column is shrunk so we have more space
* for new columns. The process ends when the whole thing no longer
* fits in data->total_width.
*/
static void shrink_columns(struct column_data *data)
{
data->width = xrealloc(data->width,
sizeof(*data->width) * data->cols);
while (data->rows > 1) {
int x, total_width, cols, rows;
rows = data->rows;
cols = data->cols;

data->rows--;
data->cols = DIV_ROUND_UP(data->list->nr, data->rows);
if (data->cols != cols)
data->width = xrealloc(data->width,
sizeof(*data->width) * data->cols);
compute_column_width(data);

total_width = strlen(data->opts.indent);
for (x = 0; x < data->cols; x++) {
total_width += data->len[data->width[x]];
total_width += data->opts.padding;
}
if (total_width > data->opts.width) {
data->rows = rows;
data->cols = cols;
break;
}
}
compute_column_width(data);
}

/* Display without layout when not enabled */
static void display_plain(const struct string_list *list,
const char *indent, const char *nl)
{
int i;

for (i = 0; i < list->nr; i++)
printf("%s%s%s", indent, list->items[i].string, nl);
}

/* Print a cell to stdout with all necessary leading/traling space */
static int display_cell(struct column_data *data, int initial_width,
const char *empty_cell, int x, int y)
{
int i, len, newline;

i = XY2LINEAR(data, x, y);
if (i >= data->list->nr)
return -1;

len = data->len[i];
if (data->width && data->len[data->width[x]] < initial_width) {
/*
* empty_cell has initial_width chars, if real column
* is narrower, increase len a bit so we fill less
* space.
*/
len += initial_width - data->len[data->width[x]];
len -= data->opts.padding;
}

if (COL_LAYOUT(data->colopts) == COL_COLUMN)
newline = i + data->rows >= data->list->nr;
else
newline = x == data->cols - 1 || i == data->list->nr - 1;

printf("%s%s%s",
x == 0 ? data->opts.indent : "",
data->list->items[i].string,
newline ? data->opts.nl : empty_cell + len);
return 0;
}

/* Display COL_COLUMN or COL_ROW */
static void display_table(const struct string_list *list,
unsigned int colopts,
const struct column_options *opts)
{
struct column_data data;
int x, y, i, initial_width;
char *empty_cell;

memset(&data, 0, sizeof(data));
data.list = list;
data.colopts = colopts;
data.opts = *opts;

data.len = xmalloc(sizeof(*data.len) * list->nr);
for (i = 0; i < list->nr; i++)
data.len[i] = item_length(colopts, list->items[i].string);

layout(&data, &initial_width);

if (colopts & COL_DENSE)
shrink_columns(&data);

empty_cell = xmalloc(initial_width + 1);
memset(empty_cell, ' ', initial_width);
empty_cell[initial_width] = '\0';
for (y = 0; y < data.rows; y++) {
for (x = 0; x < data.cols; x++)
if (display_cell(&data, initial_width, empty_cell, x, y))
break;
}

free(data.len);
free(data.width);
free(empty_cell);
}

void print_columns(const struct string_list *list, unsigned int colopts,
const struct column_options *opts)
{
struct column_options nopts;

if (!list->nr)
return;
assert((colopts & COL_ENABLE_MASK) != COL_AUTO);

memset(&nopts, 0, sizeof(nopts));
nopts.indent = opts && opts->indent ? opts->indent : "";
nopts.nl = opts && opts->nl ? opts->nl : "\n";
nopts.padding = opts ? opts->padding : 1;
nopts.width = opts && opts->width ? opts->width : term_columns() - 1;
if (!column_active(colopts)) {
display_plain(list, "", "\n");
return;
}
switch (COL_LAYOUT(colopts)) {
case COL_PLAIN:
display_plain(list, nopts.indent, nopts.nl);
break;
case COL_ROW:
case COL_COLUMN:
display_table(list, colopts, &nopts);
break;
default:
die("BUG: invalid layout mode %d", COL_LAYOUT(colopts));
}
}

int finalize_colopts(unsigned int *colopts, int stdout_is_tty)
{
if ((*colopts & COL_ENABLE_MASK) == COL_AUTO) {
if (stdout_is_tty < 0)
stdout_is_tty = isatty(1);
*colopts &= ~COL_ENABLE_MASK;
if (stdout_is_tty)
*colopts |= COL_ENABLED;
}
return 0;
}

struct colopt {
const char *name;
unsigned int value;
unsigned int mask;
};

#define LAYOUT_SET 1
#define ENABLE_SET 2

static int parse_option(const char *arg, int len, unsigned int *colopts,
int *group_set)
{
struct colopt opts[] = {
{ "always", COL_ENABLED, COL_ENABLE_MASK },
{ "never", COL_DISABLED, COL_ENABLE_MASK },
{ "auto", COL_AUTO, COL_ENABLE_MASK },
{ "plain", COL_PLAIN, COL_LAYOUT_MASK },
{ "column", COL_COLUMN, COL_LAYOUT_MASK },
{ "row", COL_ROW, COL_LAYOUT_MASK },
{ "dense", COL_DENSE, 0 },
};
int i;

for (i = 0; i < ARRAY_SIZE(opts); i++) {
int set = 1, arg_len = len, name_len;
const char *arg_str = arg;

if (!opts[i].mask) {
if (arg_len > 2 && !strncmp(arg_str, "no", 2)) {
arg_str += 2;
arg_len -= 2;
set = 0;
}
}

name_len = strlen(opts[i].name);
if (arg_len != name_len ||
strncmp(arg_str, opts[i].name, name_len))
continue;

switch (opts[i].mask) {
case COL_ENABLE_MASK:
*group_set |= ENABLE_SET;
break;
case COL_LAYOUT_MASK:
*group_set |= LAYOUT_SET;
break;
}

if (opts[i].mask)
*colopts = (*colopts & ~opts[i].mask) | opts[i].value;
else {
if (set)
*colopts |= opts[i].value;
else
*colopts &= ~opts[i].value;
}
return 0;
}

return error("unsupported option '%s'", arg);
}

static int parse_config(unsigned int *colopts, const char *value)
{
const char *sep = " ,";
int group_set = 0;

while (*value) {
int len = strcspn(value, sep);
if (len) {
if (parse_option(value, len, colopts, &group_set))
return -1;

value += len;
}
value += strspn(value, sep);
}
/*
* Setting layout implies "always" if neither always, never
* nor auto is specified.
*
* Current value in COL_ENABLE_MASK is disregarded. This means if
* you set column.ui = auto and pass --column=row, then "auto"
* will become "always".
*/
if ((group_set & LAYOUT_SET) && !(group_set & ENABLE_SET))
*colopts = (*colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
return 0;
}

static int column_config(const char *var, const char *value,
const char *key, unsigned int *colopts)
{
if (!value)
return config_error_nonbool(var);
if (parse_config(colopts, value))
return error("invalid column.%s mode %s", key, value);
return 0;
}

int git_column_config(const char *var, const char *value,
const char *command, unsigned int *colopts)
{
const char *it = skip_prefix(var, "column.");
if (!it)
return 0;

if (!strcmp(it, "ui"))
return column_config(var, value, "ui", colopts);

if (command && !strcmp(it, command))
return column_config(var, value, it, colopts);

return 0;
}

int parseopt_column_callback(const struct option *opt,
const char *arg, int unset)
{
unsigned int *colopts = opt->value;
*colopts |= COL_PARSEOPT;
*colopts &= ~COL_ENABLE_MASK;
if (unset) /* --no-column == never */
return 0;
/* --column == always unless "arg" states otherwise */
*colopts |= COL_ENABLED;
if (arg)
return parse_config(colopts, arg);

return 0;
}

static int fd_out = -1;
static struct child_process column_process;

int run_column_filter(int colopts, const struct column_options *opts)
{
const char *av[10];
int ret, ac = 0;
struct strbuf sb_colopt = STRBUF_INIT;
struct strbuf sb_width = STRBUF_INIT;
struct strbuf sb_padding = STRBUF_INIT;

if (fd_out != -1)
return -1;

av[ac++] = "column";
strbuf_addf(&sb_colopt, "--raw-mode=%d", colopts);
av[ac++] = sb_colopt.buf;
if (opts && opts->width) {
strbuf_addf(&sb_width, "--width=%d", opts->width);
av[ac++] = sb_width.buf;
}
if (opts && opts->indent) {
av[ac++] = "--indent";
av[ac++] = opts->indent;
}
if (opts && opts->padding) {
strbuf_addf(&sb_padding, "--padding=%d", opts->padding);
av[ac++] = sb_padding.buf;
}
av[ac] = NULL;

fflush(stdout);
memset(&column_process, 0, sizeof(column_process));
column_process.in = -1;
column_process.out = dup(1);
column_process.git_cmd = 1;
column_process.argv = av;

ret = start_command(&column_process);

strbuf_release(&sb_colopt);
strbuf_release(&sb_width);
strbuf_release(&sb_padding);

if (ret)
return -2;

fd_out = dup(1);
close(1);
dup2(column_process.in, 1);
close(column_process.in);
return 0;
}

int stop_column_filter(void)
{
if (fd_out == -1)
return -1;

fflush(stdout);
close(1);
finish_command(&column_process);
dup2(fd_out, 1);
close(fd_out);
fd_out = -1;
return 0;
}
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