From 875ae5235973b09ce78639533024cbb2e1253775 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Wed, 29 Nov 2023 21:05:22 +0100
Subject: Add a README

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 README.md | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 README.md

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+# Opts
+
+Opts is a simple Go library implementing unicode-aware getopt(3)- and
+getopt_long(3) flag parsing in Go.  For details, check out the godoc
+documentation.
+
+Note that unlike the `getopt()` C function, the ‘:’ and ‘?’ flags are not
+returned on errors — the errors are instead returned via the `err` return value
+of `opts.Get()` and `opts.GetLong()`.  Additionally, a leading ‘:’ in the
+opt-string provided to `opts.Get()` is not supported; you are responsible for
+your own I/O.
+
+## Example Usage
+
+The following demonstrates an example usage of the `opts.Get()` function:
+
+```go
+package main
+
+import (
+    "fmt"
+    "os"
+
+    "git.sr.ht/~mango/opts"
+)
+
+func usage() {
+    fmt.Fprintf(os.Stderr, "Usage: %s [-ßλ] [-a arg]\n", os.Args[0])
+    os.Exit(1)
+}
+
+func main() {
+    flags, optind, err := opts.Get(os.Args, "a:ßλ")
+    if err != nil {
+        fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
+        usage()
+    }
+
+    for _, opt := range opts {
+        switch opt.Key {
+        case 'a':
+            fmt.Println("-a given with argument", opt.Value)
+        case 'ß':
+            fmt.Println("-ß given")
+        case 'λ':
+            fmt.Println("-λ given")
+        }
+    }
+
+    // The remaining arguments
+    rest := os.Args[optind:]
+}
+```
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