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/*
* logging for cowdancer.
* Copyright (C) 2016 Jessica Clarke
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#define _GNU_SOURCE
#include "log.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static const char *red = "\033[0;31m";
static const char *yellow = "\033[1;33m";
static const char *blue = "\033[0;34m";
static const char *reset = "\033[0m";
static int called_setupterm = 0;
static log_level filter_level = log_info;
static log_use_colors use_colors = log_use_colors_auto;
/* Same as use_colors, but stays as auto even when auto has been resolved */
static log_use_colors use_colors_orig = log_use_colors_auto;
static int term_supports_colors(void) {
const char *term;
term = getenv("TERM");
if (term &&
(!strcmp(term, "dumb") ||
!strcmp(term, "vt100") ||
!strcmp(term, "vt220"))) {
return 0;
}
/* assume colour support on all modern terminals */
return isatty(1);
}
static FILE *file_for_level(log_level level) {
switch (level & LOG_LEVEL_MASK) {
case log_debug:
case log_info:
return stdout;
case log_warn:
case log_error:
default:
return stderr;
}
}
log_level log_get_filter_level(void) {
return filter_level;
}
void log_set_filter_level(log_level filter_level_new) {
filter_level = filter_level_new;
}
log_use_colors log_get_use_colors(void) {
if (use_colors == log_use_colors_auto) {
if (term_supports_colors()) {
use_colors = log_use_colors_yes;
} else {
use_colors = log_use_colors_no;
}
}
return use_colors;
}
log_use_colors log_get_use_colors_unresolved(void) {
return use_colors_orig;
}
void log_set_use_colors(log_use_colors use_colors_new) {
use_colors = use_colors_orig = use_colors_new;
}
void log_perror(const char *s) {
if (s != NULL && *s) {
log_printf(log_error, "%s: %s", s, strerror(errno));
} else {
log_printf(log_error, "%s", strerror(errno));
}
}
void log_printf(log_level level, const char *format, ...) {
va_list args;
if (level < filter_level) {
return;
}
log_begin(level);
va_start(args, format);
log_vmiddle(level, format, args);
va_end(args);
log_end(level);
}
void log_begin(log_level level) {
const char *color_str;
FILE *file;
const char *level_str;
if (level < filter_level) {
return;
}
file = file_for_level(level);
if (use_colors == log_use_colors_auto) {
if (term_supports_colors()) {
use_colors = log_use_colors_yes;
} else {
use_colors = log_use_colors_no;
}
}
switch (level & LOG_LEVEL_MASK) {
case log_debug:
color_str = blue;
level_str = "D";
break;
case log_info:
color_str = reset;
level_str = "I";
break;
case log_warn:
color_str = yellow;
level_str = "W";
break;
case log_error:
color_str = red;
level_str = "E";
break;
default:
color_str = red;
level_str = "?";
break;
}
if (use_colors == log_use_colors_yes) {
fprintf(file, "%s", color_str);
}
fprintf(file, "%s: ", level_str);
}
void log_middle(log_level level, const char *format, ...) {
va_list args;
FILE *file;
if (level < filter_level) {
return;
}
file = file_for_level(level);
va_start(args, format);
vfprintf(file, format, args);
va_end(args);
}
void log_vmiddle(log_level level, const char *format, va_list args) {
FILE *file;
if (level < filter_level) {
return;
}
file = file_for_level(level);
vfprintf(file, format, args);
}
void log_end(log_level level) {
FILE *file;
if (level < filter_level) {
return;
}
file = file_for_level(level);
if (use_colors == log_use_colors_yes) {
fprintf(file, "%s\n", reset);
} else {
fprintf(file, "\n");
}
}
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