Support leading, trailing and double colons in MANPATH to prepend,

append or insert the man.conf(5) default path; compatible with GNU
manpath(1), implementation by kristaps@, heavily tweaked by schwarze@.

Updates to MANPATH documentation applied to whatis.1, apropos.1, and
catman.8 also.

1 files changed, 45 insertions, 6 deletions

diff --git a/manpath.c b/manpath.c
index 9c4d254c..561911cb 100644
--- a/manpath.c
+++ b/manpath.c
@@ -87,15 +87,54 @@ manpath_parse(struct manpaths *dirs, const char *file,
 	free(buf);
 	pclose(stream);
 #else
-	manpath_parseline(dirs, auxp);
+	char		*insert;
 
-	if (NULL == defp)
-		defp = getenv("MANPATH");
+	/* Always prepend -m. */
+ 	manpath_parseline(dirs, auxp);
+ 
+	/* If -M is given, it overrides everything else. */
+	if (NULL != defp) {
+		manpath_parseline(dirs, defp);
+		return;
+	}
+
+	/* MANPATH and man.conf(5) cooperate. */
+	defp = getenv("MANPATH");
+	if (NULL == file)
+		file = MAN_CONF_FILE;
+
+	/* No MANPATH; use man.conf(5) only. */
+	if (NULL == defp || '\0' == defp[0]) {
+		manpath_manconf(dirs, file);
+		return;
+	}
+
+	/* Prepend man.conf(5) to MANPATH. */
+	if (':' == defp[0]) {
+		manpath_manconf(dirs, file);
+		manpath_parseline(dirs, defp);
+		return;
+	}
 
-	if (NULL == defp)
-		manpath_manconf(dirs, file ? file : MAN_CONF_FILE);
-	else
+	/* Append man.conf(5) to MANPATH. */
+	if (':' == defp[(int)strlen(defp) - 1]) {
 		manpath_parseline(dirs, defp);
+		manpath_manconf(dirs, file);
+		return;
+	}
+
+	/* Insert man.conf(5) into MANPATH. */
+	insert = strstr(defp, "::");
+	if (NULL != insert) {
+		*insert++ = '\0';
+		manpath_parseline(dirs, defp);
+		manpath_manconf(dirs, file);
+		manpath_parseline(dirs, insert + 1);
+		return;
+	}
+
+	/* MANPATH overrides man.conf(5) completely. */
+	manpath_parseline(dirs, defp);
 #endif
 }