1 files changed, 76 insertions, 0 deletions
diff --git a/handlers_meta.go b/handlers_meta.go
new file mode 100644
index 0000000..f0f7ef7
--- /dev/null
+++ b/handlers_meta.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+    "./cli"
+)
+
+func printVersion(ctx cli.Context) {
+    fmt.Printf("%s v%s\n", Name, Version)
+}
+
+func printHelp(ctx cli.Context) {
+    fmt.Printf("%s usage:\n\n", Name)
+
+    for _, h := range ctx.Handlers() {
+        fmt.Printf("%s %s  (%s)\n", Name, h.Pattern, h.Description)
+    }
+}
+
+func printCommandHelp(ctx cli.Context) {
+    args := ctx.Args()
+    prefix := []string{args.String("command")}
+    printCommandPrefixHelp(prefix, ctx)
+}
+
+func printSubCommandHelp(ctx cli.Context) {
+    args := ctx.Args()
+    prefix := []string{args.String("command"), args.String("subcommand")}
+    printCommandPrefixHelp(prefix, ctx)
+}
+
+func printCommandPrefixHelp(prefix []string, ctx cli.Context) {
+    handler := getHandler(ctx.Handlers(), prefix)
+
+    if handler == nil {
+        ExitF("Command not found")
+    }
+
+    fmt.Printf("%s %s  (%s)\n", Name, handler.Pattern, handler.Description)
+    for name, flags := range handler.Flags {
+        fmt.Printf("\n%s:\n", name)
+        for _, flag := range flags {
+            fmt.Printf("  %s  (%s)\n", strings.Join(flag.GetPatterns(), ", "), flag.GetDescription())
+        }
+    }
+}
+
+func getHandler(handlers []*cli.Handler, prefix []string) *cli.Handler {
+    for _, h := range handlers {
+        pattern := stripOptionals(h.SplitPattern())
+
+        if len(prefix) > len(pattern) {
+            continue
+        }
+
+        if equal(prefix, pattern[:len(prefix)]) {
+            return h
+        }
+    }
+
+    return nil
+}
+
+// Strip optional groups (<...>) from pattern
+func stripOptionals(pattern []string) []string {
+    newArgs := []string{}
+
+    for _, arg := range pattern {
+        if strings.HasPrefix(arg, "[") && strings.HasSuffix(arg, "]") {
+            continue
+        }
+        newArgs = append(newArgs, arg)
+    }
+    return newArgs
+}