add the possibility for output line transformaton - lchat - A line oriented chat front end for ii.
 (HTM) git clone git://git.suckless.org/lchat
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       ---
 (DIR) commit d03daa3fb2b41a1a969b9d4fdb0197cea471d4a0
 (DIR) parent 3e18627b65da00ad5282946bd93e112aabb99491
 (HTM) Author: Jan Klemkow <j.klemkow@wemelug.de>
       Date:   Tue,  5 Jan 2016 22:45:16 +0100
       
       add the possibility for output line transformaton
       
       Diffstat:
         M lchat.1                             |       5 +++++
         M lchat.c                             |       6 +++++-
       
       2 files changed, 10 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/lchat.1 b/lchat.1
       @@ -79,6 +79,11 @@ Default path is the current working directory.
        .Bl -tag -width Ds
        .It .bellmatch
        contains regular expressions that controls bell ring on matching input.
       +.It .filter
       +If this file exists and has executable permissions, it is used as a filter
       +program for the output lines.
       +This program should read raw lines from stdin and outputs filtered or
       +transformed lines to stdout.
        .El
        .Sh SEE ALSO
        .Xr tail 1 ,
 (DIR) diff --git a/lchat.c b/lchat.c
       @@ -1,5 +1,5 @@
        /*
       - * Copyright (c) 2015 Jan Klemkow <j.klemkow@wemelug.de>
       + * Copyright (c) 2015-2016 Jan Klemkow <j.klemkow@wemelug.de>
         *
         * Permission to use, copy, modify, and distribute this software for any
         * purpose with or without fee is hereby granted, provided that the above
       @@ -215,6 +215,10 @@ main(int argc, char *argv[])
                /* open external source */
                snprintf(tail_cmd, sizeof tail_cmd, "exec tail -n %zd -f %s",
                    history_len, out_file);
       +
       +        if (access(".filter", X_OK) == 0)
       +                strlcat(tail_cmd, " | ./.filter", sizeof tail_cmd);
       +
                if ((tail_fh = popen(tail_cmd, "r")) == NULL)
                        err(EXIT_FAILURE, "unable to open pipe to tail command");