From 2c25d99ad036c9ad473167b4f2f8e7dea9cd946e Mon Sep 17 00:00:00 2001
From: Lukas Fleischer <calcurse@cryptocrack.de>
Date: Wed, 17 Jul 2013 01:00:53 +0200
Subject: Add help command

This adds a "help" command to the list of available command mode
commands. You can currently type "help", followed by a topic like "add".
calcurse will then try to open a file named "add.txt" in the
documentation directory and display it in an external pager.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
---
 src/Makefile.am |  1 +
 src/calcurse.c  | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/Makefile.am b/src/Makefile.am
index 44d1ae8..3559a25 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,6 +2,7 @@ AUTOMAKE_OPTIONS = foreign
 
 bin_PROGRAMS = calcurse
 
+AM_CPPFLAGS = -DDOCDIR=\"@docdir@\"
 AM_CFLAGS = -std=c99 -pedantic -D_POSIX_C_SOURCE=200809L
 
 calcurse_SOURCES = \
diff --git a/src/calcurse.c b/src/calcurse.c
index 460f4c4..d20e9d0 100644
--- a/src/calcurse.c
+++ b/src/calcurse.c
@@ -491,12 +491,41 @@ static inline void key_generic_quit(void)
 static inline void key_generic_cmd(void)
 {
 	char cmd[BUFSIZ] = "";
+	char *cmd_name;
 
 	status_mesg(_("Command:"), "");
 	if (getstring(win[STA].p, cmd, BUFSIZ, 0, 1) != GETSTRING_VALID)
 		return;
 
-	wins_update(FLAG_STA);
+	cmd_name = strtok(cmd, " ");
+
+	if (!strcmp(cmd_name, "help")) {
+		char *topic = strtok(NULL, " ");
+		char path[BUFSIZ];
+
+		snprintf(path, BUFSIZ, DOCDIR "/%s.txt", topic);
+		if (io_file_exist(path)) {
+			wins_launch_external(path, conf.pager);
+		} else {
+			char error_msg[BUFSIZ];
+
+			snprintf(error_msg, BUFSIZ,
+					_("Help topic does not exist: %s"),
+					topic);
+			error_msg[BUFSIZ - 1] = '\0';
+
+			warnbox(error_msg);
+		}
+	} else {
+		char error_msg[BUFSIZ];
+
+		snprintf(error_msg, BUFSIZ, _("No such command: %s"), cmd);
+		error_msg[BUFSIZ - 1] = '\0';
+
+		warnbox(error_msg);
+	}
+
+	wins_update(FLAG_ALL);
 }
 
 /*
-- 
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