feat: Package for command-line arguments

cmd/gogrep/main.go

@@ -3,9 +3,10 @@ package main
 import (
 	"fmt"
 	"io/fs"
+	"log"
 	"path/filepath"
-	"regexp"
 
+	cui "gitea.likemath.ru/alex/gogrep/internal/cui-args"
 	models "gitea.likemath.ru/alex/gogrep/internal/models"
 	processing "gitea.likemath.ru/alex/gogrep/internal/processing"
 )
@@ -14,18 +15,9 @@ import (
 const ChannelBuffering = 10
 
 func main() {
-	pathPattern := "git/hook"
+	config, err := cui.ProcessConsoleArguments()
-	rePathPattern, err := regexp.Compile(pathPattern)
 	if err != nil {
-		fmt.Printf("Unable to compile path pattern Regexp: %v\n", pathPattern)
+		log.Fatalf("Invalid config: %v\n", err)
-		return
-	}
-
-	textPattern := "the commit"
-	reTextPattern, err := regexp.Compile(textPattern)
-	if err != nil {
-		fmt.Printf("Unable to compile text pattern Regexp: %v\n", textPattern)
-		return
 	}
 	processedChannel := make(chan models.FileMatchData, ChannelBuffering)
 	totalFiles := 0
@@ -34,7 +26,7 @@ func main() {
 			fmt.Printf("prevent panic by handling failure accessing a path %q: %v\n", path, err)
 			return err
 		}
-		if rePathPattern.FindString(path) == "" {
+		if config.PathPattern.FindString(path) == "" {
 			return nil
 		}
 		// if info.IsDir() && info.Name() == subDirToSkip {
@@ -44,7 +36,7 @@ func main() {
 		if info.IsDir() {
 			return nil
 		}
-		go processing.ProcessSingleFile(*reTextPattern, path, processedChannel)
+		go processing.ProcessSingleFile(config.TextPattern, path, processedChannel)
 		totalFiles++
 
 		return nil
@@ -62,7 +54,7 @@ func main() {
 	}
 
 	if err != nil {
-		fmt.Printf("error walking the path %q: %v\n", pathPattern, err)
+		fmt.Printf("error walking the path %q: %v\n", config.PathPattern, err)
 		return
 	}
 }

internal/cui-args/args_reader.go

@@ -0,0 +1,29 @@
+package cuiargs
+
+import (
+	"fmt"
+	"regexp"
+
+	models "gitea.likemath.ru/alex/gogrep/internal/models"
+)
+
+// ProcessConsoleArguments fills internal grep config
+// Returns error if arguments filling is correct, but arguments are incorrect
+// Panics and shows info if arguments are invalid
+func ProcessConsoleArguments() (*models.GrepConfigInternal, error) {
+	res := &models.GrepConfigInternal{}
+
+	var err error
+	pathPattern := "git/hook"
+	res.PathPattern, err = regexp.Compile(pathPattern)
+	if err != nil {
+		return nil, fmt.Errorf("unable to compile path pattern Regexp: %v", pathPattern)
+	}
+
+	textPattern := "the commit"
+	res.TextPattern, err = regexp.Compile(textPattern)
+	if err != nil {
+		return nil, fmt.Errorf("unable to compile text pattern Regexp: %v", textPattern)
+	}
+	return res, nil
+}

internal/models/config.go

@@ -0,0 +1,9 @@
+package models
+
+import "regexp"
+
+// GrepConfigInternal defines valid grep configuration after parameters parsing
+type GrepConfigInternal struct {
+	PathPattern *regexp.Regexp
+	TextPattern *regexp.Regexp
+}

internal/processing/processing.go

@@ -11,7 +11,7 @@ import (
 )
 
 // ProcessSingleFile processes file and send it Result to channel
-func ProcessSingleFile(rePattern regexp.Regexp, path string, out chan models.FileMatchData) {
+func ProcessSingleFile(rePattern *regexp.Regexp, path string, out chan models.FileMatchData) {
 	file, err := os.Open(path)
 	if err != nil {
 		log.Fatal(err)