From 1620b36b70219123ce7d0662b8c05e67807be351 Mon Sep 17 00:00:00 2001
From: "Glenn Y. Rolland" <glenux@glenux.net>
Date: Sat, 15 Feb 2020 17:46:58 +0100
Subject: [PATCH] Add pattern matching

---
 cmd/randomedit/main.go | 70 ++++++++++++++++++++++++++++++++++++++----
 1 file changed, 64 insertions(+), 6 deletions(-)

diff --git a/cmd/randomedit/main.go b/cmd/randomedit/main.go
index 3fdfc5f..e7472d0 100644
--- a/cmd/randomedit/main.go
+++ b/cmd/randomedit/main.go
@@ -1,23 +1,81 @@
 package main
 
 import (
+	// "flag"
 	"fmt"
+	flag "github.com/spf13/pflag"
 	"log"
+	"math/rand"
 	"os"
+	"os/exec"
+	"path"
 	"path/filepath"
+	"time"
 )
 
-func main() {
-	list := []string{}
-	err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
+func findFiles(dir string, patterns []string) []string {
+	files := []string{}
+	err := filepath.Walk(dir, func(walkpath string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
-		list = append(list, path)
+		for _, pattern := range patterns {
+			if match, _ := path.Match(pattern, path.Base(walkpath)); match {
+				// fmt.Printf("Pattern %s found %s\n", pattern, walkpath)
+				files = append(files, walkpath)
+			}
+		}
 		return nil
 	})
-	fmt.Printf("%#v\n", list)
 	if err != nil {
-		log.Println(err)
+		log.Panic(err)
 	}
+	return files
+}
+
+func main() {
+	var directories []string
+	var patterns []string
+	flag.StringArrayVarP(&directories, "dir", "d", []string{"."}, "Look in given directory")
+	flag.StringArrayVarP(&patterns, "pattern", "p", []string{}, "Match given globbing pattern")
+	flag.Parse()
+
+	if len(patterns) < 1 {
+		patterns = []string{"*.txt", "*.md"}
+	}
+
+	// fmt.Printf("%#v\n", directories)
+	editor := os.Getenv("EDITOR")
+
+	// walk dirs & merge result
+	filesSet := map[string]int{}
+	for _, dir := range directories {
+		for _, file := range findFiles(dir, patterns) {
+			if _, ok := filesSet[file]; !ok {
+				filesSet[file] = 0
+			}
+		}
+	}
+
+	// extract keys
+	files := []string{}
+	for k := range filesSet {
+		files = append(files, k)
+	}
+
+	if len(files) < 1 {
+		fmt.Println("No file found")
+		os.Exit(1)
+	}
+
+	rand.Seed(time.Now().UTC().UnixNano())
+	choice := rand.Intn(len(files))
+	fmt.Printf("%s %s\n", editor, files[choice])
+
+	// Run editor
+	cmd := exec.Command(editor, files[choice])
+	cmd.Stdout = os.Stdout
+	cmd.Stdin = os.Stdin
+	cmd.Stderr = os.Stderr
+	cmd.Run()
 }