lchat

commit d03daa3fb2b41a1a969b9d4fdb0197cea471d4a0
parent 3e18627b65da00ad5282946bd93e112aabb99491
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(-)
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 ,
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");