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/*
* GIT - The information manager from hell
*
* Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
* Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
* Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
* Copyright (C) 2006 Mike McCormack
* Copyright (C) 2006 Christian Couder
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include "cache.h"
#include "quote.h"

/* Get a trace file descriptor from "key" env variable. */
static int get_trace_fd(const char *key, int *need_close)
{
char *trace = getenv(key);

if (!trace || !strcmp(trace, "") ||
!strcmp(trace, "0") || !strcasecmp(trace, "false"))
return 0;
if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
return STDERR_FILENO;
if (strlen(trace) == 1 && isdigit(*trace))
return atoi(trace);
if (is_absolute_path(trace)) {
int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
if (fd == -1) {
fprintf(stderr,
"Could not open '%s' for tracing: %s\n"
"Defaulting to tracing on stderr...\n",
trace, strerror(errno));
return STDERR_FILENO;
}
*need_close = 1;
return fd;
}

fprintf(stderr, "What does '%s' for %s mean?\n", trace, key);
fprintf(stderr, "If you want to trace into a file, "
"then please set %s to an absolute pathname "
"(starting with /).\n", key);
fprintf(stderr, "Defaulting to tracing on stderr...\n");

return STDERR_FILENO;
}

static const char err_msg[] = "Could not trace into fd given by "
"GIT_TRACE environment variable";

void trace_vprintf(const char *key, const char *fmt, va_list ap)
{
struct strbuf buf = STRBUF_INIT;

if (!trace_want(key))
return;

set_try_to_free_routine(NULL); /* is never reset */
strbuf_vaddf(&buf, fmt, ap);
trace_strbuf(key, &buf);
strbuf_release(&buf);
}

static void trace_printf_key(const char *key, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
trace_vprintf(key, fmt, ap);
va_end(ap);
}

void trace_printf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
trace_vprintf("GIT_TRACE", fmt, ap);
va_end(ap);
}

void trace_strbuf(const char *key, const struct strbuf *buf)
{
int fd, need_close = 0;

fd = get_trace_fd(key, &need_close);
if (!fd)
return;

write_or_whine_pipe(fd, buf->buf, buf->len, err_msg);

if (need_close)
close(fd);
}

void trace_argv_printf(const char **argv, const char *fmt, ...)
{
struct strbuf buf = STRBUF_INIT;
va_list ap;
int fd, need_close = 0;

fd = get_trace_fd("GIT_TRACE", &need_close);
if (!fd)
return;

set_try_to_free_routine(NULL); /* is never reset */
va_start(ap, fmt);
strbuf_vaddf(&buf, fmt, ap);
va_end(ap);

sq_quote_argv(&buf, argv, 0);
strbuf_addch(&buf, '\n');
write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
strbuf_release(&buf);

if (need_close)
close(fd);
}

static const char *quote_crnl(const char *path)
{
static char new_path[PATH_MAX];
const char *p2 = path;
char *p1 = new_path;

if (!path)
return NULL;

while (*p2) {
switch (*p2) {
case '\\': *p1++ = '\\'; *p1++ = '\\'; break;
case '\n': *p1++ = '\\'; *p1++ = 'n'; break;
case '\r': *p1++ = '\\'; *p1++ = 'r'; break;
default:
*p1++ = *p2;
}
p2++;
}
*p1 = '\0';
return new_path;
}

/* FIXME: move prefix to startup_info struct and get rid of this arg */
void trace_repo_setup(const char *prefix)
{
static const char *key = "GIT_TRACE_SETUP";
const char *git_work_tree;
char cwd[PATH_MAX];

if (!trace_want(key))
return;

if (!getcwd(cwd, PATH_MAX))
die("Unable to get current working directory");

if (!(git_work_tree = get_git_work_tree()))
git_work_tree = "(null)";

if (!prefix)
prefix = "(null)";

trace_printf_key(key, "setup: git_dir: %s\n", quote_crnl(get_git_dir()));
trace_printf_key(key, "setup: worktree: %s\n", quote_crnl(git_work_tree));
trace_printf_key(key, "setup: cwd: %s\n", quote_crnl(cwd));
trace_printf_key(key, "setup: prefix: %s\n", quote_crnl(prefix));
}

int trace_want(const char *key)
{
const char *trace = getenv(key);

if (!trace || !strcmp(trace, "") ||
!strcmp(trace, "0") || !strcasecmp(trace, "false"))
return 0;
return 1;
}
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