Support recursive glob patterns

Author: DenisPalnitsky

Diff for: README.md

@@ -28,10 +28,10 @@ This will create a file named "file-for-ai.txt" in your current directory with t
 You can also use a glob pattern:
 
 ``` bash
-file-for-ai *.txt
+file-for-ai ./**/*.txt
 ```
 
-This will create a file named "file-for-ai.txt" in your current directory with the contents of all text files matching the pattern.
+This will create a file named "file-for-ai.txt" in your current directory with the contents of all txt files in the current directory and its subdirectories.
 
 To specify a custom output file name:
 

Diff for: go.mod

@@ -31,6 +31,7 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.11.0 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
+	github.com/yargevad/filepathx v1.0.0 // indirect
 	golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect
 	golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6 // indirect
 	golang.org/x/text v0.3.7 // indirect

Diff for: go.sum

@@ -305,6 +305,8 @@ github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/yargevad/filepathx v1.0.0 h1:SYcT+N3tYGi+NvazubCNlvgIPbzAk7i7y2dwg3I5FYc=
+github.com/yargevad/filepathx v1.0.0/go.mod h1:BprfX/gpYNJHJfc35GjRRpVcwWXS89gGulUIU5tK3tA=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

Diff for: main.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/denormal/go-gitignore"
+	"github.com/yargevad/filepathx"
 
 	"github.com/num30/config"
 	"github.com/pkoukk/tiktoken-go"
@@ -35,7 +36,7 @@ func main() {
 		fmt.Println("Usage: file-for-ai <directory|pattern> --output [output file]")
 		fmt.Println("\nExamples:")
 		fmt.Println("  file-for-ai /path/to/directory")
-		fmt.Println("  file-for-ai '*.txt'")
+		fmt.Println("  file-for-ai './*.txt'")
 		fmt.Println("  file-for-ai /path/to/directory --output custom-output.txt")
 		fmt.Println("\nFor more information, visit https://github.com/num30/file-for-ai?tab=readme-ov-file#file-for-ai")
 		os.Exit(1)
@@ -45,11 +46,6 @@ func main() {
 
 	outputFileName := conf.OutputFile
 
-	if _, err := os.Stat(outputFileName); !os.IsNotExist(err) {
-		fmt.Printf("Output file %s already exists\n", outputFileName)
-		os.Exit(1)
-	}
-
 	outputFile, err := os.Create(outputFileName)
 	if err != nil {
 		fmt.Println("Error creating output file:", err)
@@ -87,7 +83,7 @@ func main() {
 			return processFile(inputPath, path, info, outputFile, tkm, &tokens, outputFileName)
 		})
 	} else {
-		files, err := filepath.Glob(inputPath)
+		files, err := filepathx.Glob(inputPath)
 		if err != nil {
 			fmt.Println("Error parsing glob pattern:", err)
 			os.Exit(1)