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column: support piping stdout to external git-column process

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For too complicated output handling, it'd be easier to just spawn
git-column and redirect stdout to it. This patch provides helpers
to do that.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2012-04-13 17:54:40 +07:00 committed by Junio C Hamano
parent 323d053091
commit b27004eb32
2 changed files with 72 additions and 0 deletions
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69
column.c
View File

@ -2,6 +2,7 @@
#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 ? \
@ -363,3 +364,71 @@ int parseopt_column_callback(const struct option *opt,
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;
}

3
column.h
View File

@ -39,4 +39,7 @@ static inline int column_active(unsigned int colopts)
extern void print_columns(const struct string_list *list, unsigned int colopts,
const struct column_options *opts);
extern int run_column_filter(int colopts, const struct column_options *);
extern int stop_column_filter(void);
#endif