104 lines
1.9 KiB
C
104 lines
1.9 KiB
C
/*
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* Copyright (C) 2012 Ondrej Oprala <ooprala@redhat.com>
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*
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* This file may be distributed under the terms of the
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* GNU Lesser General Public License.
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*/
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#include <c.h>
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#include <assert.h>
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#include "colors.h"
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static int ul_color_term_ok;
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int colors_init(int mode)
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{
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switch (mode) {
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case UL_COLORMODE_AUTO:
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ul_color_term_ok = isatty(STDOUT_FILENO);
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break;
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case UL_COLORMODE_ALWAYS:
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ul_color_term_ok = 1;
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break;
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case UL_COLORMODE_NEVER:
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default:
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ul_color_term_ok = 0;
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}
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return ul_color_term_ok;
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}
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void color_enable(const char *color_scheme)
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{
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if (ul_color_term_ok && color_scheme)
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fputs(color_scheme, stdout);
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}
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void color_disable(void)
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{
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if (ul_color_term_ok)
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fputs(UL_COLOR_RESET, stdout);
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}
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int colormode_from_string(const char *str)
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{
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size_t i;
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static const char *modes[] = {
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[UL_COLORMODE_AUTO] = "auto",
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[UL_COLORMODE_NEVER] = "never",
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[UL_COLORMODE_ALWAYS] = "always"
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};
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if (!str || !*str)
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return -EINVAL;
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assert(ARRAY_SIZE(modes) == __UL_NCOLORMODES);
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for (i = 0; i < ARRAY_SIZE(modes); i++) {
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if (strcasecmp(str, modes[i]) == 0)
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return i;
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}
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return -EINVAL;
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}
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int colormode_or_err(const char *str, const char *errmsg)
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{
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const char *p = str && *str == '=' ? str + 1 : str;
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int colormode;
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colormode = colormode_from_string(p);
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if (colormode < 0)
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errx(EXIT_FAILURE, "%s: '%s'", errmsg, p);
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return colormode;
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}
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#ifdef TEST_PROGRAM
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# include <getopt.h>
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int main(int argc, char *argv[])
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{
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static const struct option longopts[] = {
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{ "colors", optional_argument, 0, 'c' },
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{ NULL, 0, 0, 0 }
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};
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int c, mode = UL_COLORMODE_NEVER; /* default */
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while ((c = getopt_long(argc, argv, "c::", longopts, NULL)) != -1) {
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switch (c) {
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case 'c':
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mode = UL_COLORMODE_AUTO;
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if (optarg)
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mode = colormode_or_err(optarg, "unsupported color mode");
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break;
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}
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}
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colors_init(mode);
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color_enable(UL_COLOR_RED);
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printf("Hello World!");
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color_disable();
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return EXIT_SUCCESS;
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}
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#endif
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