help and README

README.md

@@ -5,9 +5,19 @@ A base64 encoder & decoder in Zig
 ## Usage
 
 ```shell
-# Encoding
+# Print help
-echo -n "hello" | baze64
 
-# Decoding
+# Encoding
-echo -n "aGVsbG8=" | baze64
+> baze64 "hello"
+
+# Decoding with -D or -d
+> baze64 -D "aGVsbG8="
+
+# Print help
+> baze64 -H
+Usage: baze64 {-d/-D} {-h/-H} input
+With no arguments, encodes input into a base64 string
+Args:
+  -d -D: decodes a base64 string
+  -h -H: print this help
 ```

src/main.zig

@@ -4,9 +4,11 @@ const stdout = std.io.getStdOut().writer();
 const Base64 = @import("base64.zig");
 
 const usageText =
-    \\Usage: baze64 {-d/-D} input
+    \\Usage: baze64 {-d/-D} {-h/-H} input
+    \\With no arguments, encodes input into a base64 string
     \\Args:
-    \\  -d -D: decode instead of encode
+    \\  -d -D: decodes a base64 string
+    \\  -h -H: print this help
     ;
 
 
@@ -33,6 +35,9 @@ pub fn main() !void {
 
         if (std.mem.eql(u8, arg, "-d") or std.mem.eql(u8, arg, "-D")) {
             decodeSwitch = true;
+        } else if (std.mem.eql(u8, arg, "-h") or std.mem.eql(u8, arg, "-H")) {
+            try stdout.print("{s}\n", .{usageText});
+            std.process.exit(0);
         } else {
             input = arg;
             break;