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