pulled out from my fork of upstream repo

1 files changed, 79 insertions, 0 deletions

diff --git a/config.go b/config.go
new file mode 100644
index 0000000..da8313a
--- /dev/null
+++ b/config.go
@@ -0,0 +1,79 @@
+package main
+
+/* 
+	This simply parses the command line arguments using the default golang
+	package called 'flag'. This can be used as a simple template to parse
+	command line arguments in other programs.
+
+	It puts everything in the 'config' package which I think is a good
+	wrapper around the 'flags' package and doesn't need a whole mess of
+	global variables
+*/
+
+import "log"
+import "os"
+import "flag"
+import "fmt"
+import "github.com/gookit/config"
+
+var customUsage = func() {
+	fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0])
+	flag.PrintDefaults()
+
+	fmt.Println("")
+	fmt.Println("EXAMPLES:")
+	fmt.Println("")
+	fmt.Println(os.Args[0] + " --width 1024 --height 768 --drift .1 --filename shaders/seascape.glsl")
+	fmt.Println(os.Args[0] + " --width 640 --height 480 --filename shaders/planetfall.glsl")
+	fmt.Println("")
+}
+
+func parseFlags() {
+	var version       string
+	var race          bool
+	var filename      string
+	var width         int
+	var height        int
+	var glDrift       float64
+
+	flag.StringVar  (&version,       "version",       "v0.1",                     "Set compiled in version string")
+
+	flag.StringVar  (&filename,      "filename",      "shaders/seascape.glsl",    "path to GLSL file")
+	flag.IntVar     (&width,         "width",         1024,                       "Width of the OpenGL Window")
+	flag.IntVar     (&height,        "height",        768,                        "Height of the OpenGL Window")
+
+	flag.Float64Var (&glDrift,       "drift",         0.01,                       "Speed of the gradual camera drift")
+	flag.BoolVar    (&race,          "race",          race,                       "Use race detector")
+
+	// Set the output if something fails to stdout rather than stderr
+	flag.CommandLine.SetOutput(os.Stdout)
+
+	flag.Usage = customUsage
+	flag.Parse()
+
+	if flag.Parsed() {
+		log.Println("flag.Parse() worked")
+	} else {
+		log.Println("flag.Parse() failed")
+	}
+
+	// keys := []string{"filename", "width", "height", "drift"}
+	// keys := []string{"width", "height", "drift"}
+
+//	keys := []string{"height"}
+//	config.LoadFlags(keys)
+
+	config.Set("width", width)
+	config.Set("height", height)
+	config.Set("glDrift", glDrift)
+	config.Set("filename", filename)
+}
+
+func parseConfig() {
+	config.WithOptions(config.ParseEnv)
+	parseFlags()
+
+	// config.LoadOSEnv([]string{"MAIL"})
+	// config.LoadOSEnv([]string{"USER"})
+	// config.LoadOSEnv([]string{"BUILDDEBUG"})
+}