From 67a916d19ca0ba49e3af3b21aeee3108da432ae4 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Tue, 24 Jan 2017 19:40:30 +0000
Subject: [PATCH] CLI: show usage when --help/-h passed.

---
 src/platform/climain.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/platform/climain.cpp b/src/platform/climain.cpp
index 0f0c6b27..f41e2423 100644
--- a/src/platform/climain.cpp
+++ b/src/platform/climain.cpp
@@ -10,8 +10,8 @@ namespace SolveSpace {
     extern std::shared_ptr<Pixmap> framebuffer;
 }
 
-static void ShowUsage(const std::string &argv0) {
-    fprintf(stderr, "Usage: %s <command> <options> <filename> [filename...]", argv0.c_str());
+static void ShowUsage(const std::string &cmd) {
+    fprintf(stderr, "Usage: %s <command> <options> <filename> [filename...]", cmd.c_str());
 //-----------------------------------------------------------------------------> 80 col */
     fprintf(stderr, R"(
     When run, performs an action specified by <command> on every <filename>.
@@ -84,6 +84,13 @@ static void ShowUsage(const std::string &argv0) {
 static bool RunCommand(const std::vector<std::string> args) {
     if(args.size() < 2) return false;
 
+    for(const std::string &arg : args) {
+        if(arg == "--help" || arg == "-h") {
+            ShowUsage(args[0]);
+            return true;
+        }
+    }
+
     std::function<void(const std::string &)> runner;
 
     std::vector<std::string> inputFiles;