From 2767e99acf4f1bfd166ffa20465113d148a3f146 Mon Sep 17 00:00:00 2001
From: "Mike JS. Choi" <mkchoi212@icloud.com>
Date: Wed, 13 Jun 2018 18:31:15 +0900
Subject: [PATCH] Add support for -h | --help

---
 main.go    |  2 ++
 options.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 options.go

diff --git a/main.go b/main.go
index 583cd51..902a0aa 100644
--- a/main.go
+++ b/main.go
@@ -116,6 +116,8 @@ func die(err error) {
 }
 
 func main() {
+	ParseFlags()
+
 	var err error
 
 	keyBinding, err = binding.LoadSettings()
diff --git a/options.go b/options.go
new file mode 100644
index 0000000..5f2d6aa
--- /dev/null
+++ b/options.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+// ParseFlags parses flags provided by the user
+func ParseFlags() {
+	// Setup custom help message
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, `Usage:
+
+   fac
+
+Customizable variables: 
+  Behavior
+
+	cont_eval        evaluate commands without pressing ENTER
+
+  Key bindings
+
+	select_local     select local version
+	select_incoming  select incoming version
+	toggle_view      toggle to horizontal | horizontal view
+	show_up          show more lines above
+	show_down        show more lines below
+	scroll_up        ...
+	scroll_down      ...
+	edit             manually edit code chunk
+	next             go to next conflict
+	previous         go to previous conflict
+	quit             ...
+	help             display help in side bar
+
+Following variables may be defined in your $HOME/.fac.yml to customize behavior
+
+`)
+	}
+
+	flag.Parse()
+}