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/*
* Wrapper to help enable colorized man page output.
* Only works with PAGER=less
*
* https://bugs.gentoo.org/184604
* https://unix.stackexchange.com/questions/108699/documentation-on-less-termcap-variables
*
* Copyright 2003-2015 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define COLOR(c, b) "\e[" #c ";" #b "m"
#define _SE(termcap, col) setenv("LESS_TERMCAP_" #termcap, col, 0)
#define SE(termcap, c, b) _SE(termcap, COLOR(c, b))
static int usage(void)
{
puts(
"manpager: display man pages with color!\n"
"\n"
"Usage:\n"
"\texport MANPAGER=manpager\n"
"\tman man\n"
"\n"
"To control the colorization, set these env vars:\n"
"\tLESS_TERMCAP_mb - start blinking\n"
"\tLESS_TERMCAP_md - start bolding\n"
"\tLESS_TERMCAP_me - stop bolding\n"
"\tLESS_TERMCAP_us - start underlining\n"
"\tLESS_TERMCAP_ue - stop underlining\n"
"\tLESS_TERMCAP_so - start standout (reverse video)\n"
"\tLESS_TERMCAP_se - stop standout (reverse video)\n"
"\n"
"You can do so by doing:\n"
"\texport LESS_TERMCAP_md=\"$(printf '\\e[1;36m')\"\n"
"\n"
"Run 'less --help' or 'man less' for more info"
);
return 0;
}
int main(int argc, char *argv[])
{
if (argc == 2 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")))
return usage();
/* Blinking. */
SE(mb, 5, 31); /* Start. */
/* Bolding. */
SE(md, 1, 34); /* Start. */
SE(me, 0, 0); /* Stop. */
/* Underlining. */
SE(us, 4, 36); /* Start. */
SE(ue, 0, 0); /* Stop. */
#if 0
/* Standout (reverse video). */
SE(so, 1, 32); /* Start. */
SE(se, 0, 0); /* Stop. */
#endif
argv[0] = getenv("PAGER") ? : "less";
execvp(argv[0], argv);
perror("could not launch PAGER");
return 1;
}
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