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Print error if input file is a directory; print program name before error string

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This commit is contained in:
Aadhavan Srinivasan
2025-03-16 19:48:49 -04:00
parent 02b3b469c4
commit 530564b920
1 changed files with 12 additions and 3 deletions
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15
cmd/main.go
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@@ -73,11 +73,11 @@ func main() {
// 3. Run the string against the NFA
if len(flag.Args()) < 1 { // flag.Args() also strips out program name
fmt.Println("ERROR: Missing cmdline args")
fmt.Printf("%s: ERROR: Missing cmdline args\n", os.Args[0])
os.Exit(22)
}
if *recursiveFlag && len(flag.Args()) < 2 { // File/Directory must be provided with '-r'
fmt.Println("ERROR: Missing cmdline args")
fmt.Printf("%s: ERROR: Missing cmdline args\n", os.Args[0])
os.Exit(22)
}
var re string
@@ -92,7 +92,16 @@ func main() {
for _, inputFilename := range inputFilenames {
inputFile, err := os.Open(inputFilename)
if err != nil {
fmt.Printf("%s: No such file or directory\n", inputFilename)
fmt.Printf("%s: %s: No such file or directory\n", os.Args[0], inputFilename)
os.Exit(2)
}
fileStat, err := inputFile.Stat()
if err != nil {
fmt.Printf("%v\n", err)
os.Exit(2)
}
if fileStat.Mode().IsDir() {
fmt.Printf("%s: %s: Is a directory\n", os.Args[0], inputFilename)
os.Exit(2)
}
inputFiles = append(inputFiles, inputFile)