refactor: Split code between packages

internal/processing/processing.go

@@ -0,0 +1,38 @@
+package processing
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+
+	models "gitea.likemath.ru/alex/gogrep/internal/models"
+)
+
+// ProcessSingleFile processes file and send it Result to channel
+func ProcessSingleFile(rePattern regexp.Regexp, path string, out chan models.FileMatchData) {
+	file, err := os.Open(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	res := models.FileMatchData{Path: path, LineIndexes: make([]int, 0), Lines: make([]string, 0)}
+	scanner := bufio.NewScanner(file)
+	// optionally, resize scanner's capacity for lines over 64K, see next example
+	curLineInd := 1
+	for scanner.Scan() {
+		lineText := scanner.Text()
+		if rePattern.FindString(lineText) != "" {
+			res.LineIndexes = append(res.LineIndexes, curLineInd)
+			res.Lines = append(res.Lines, lineText)
+		}
+		curLineInd++
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Printf("Error %v with file %v\n", err, path)
+	}
+	out <- res
+}