From abe94aa1574363a416e0abe4b4208444e8d16afa Mon Sep 17 00:00:00 2001
From: Aleksey Lobanov <i@likemath.ru>
Date: Tue, 26 Dec 2023 00:30:17 +0300
Subject: [PATCH] feat: First naive version

---
 .devcontainer/devcontainer.json |  25 ++++++++
 go.mod                          |   3 +
 main.go                         | 100 ++++++++++++++++++++++++++++++++
 3 files changed, 128 insertions(+)
 create mode 100644 .devcontainer/devcontainer.json
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..7783fb1
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,25 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/go
+{
+	"name": "Go",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/go:1-1.21-bullseye",
+	"features": {
+		"ghcr.io/guiyomh/features/gotestsum:0": {}
+	}
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "go version",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..1820f7f
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module gitea.likemath.ru/alex/gogrep
+
+go 1.21
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..dc413d1
--- /dev/null
+++ b/main.go
@@ -0,0 +1,100 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io/fs"
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+)
+
+const CHANNEL_BUFFERING = 10
+
+type FileMatchData struct {
+	Path        string
+	LineIndexes []int
+	Lines       []string
+}
+
+func ProcessSingleFile(re_pattern regexp.Regexp, path string, out chan FileMatchData) error {
+	file, err := os.Open(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	res := 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
+	cur_line_ind := 1
+	for scanner.Scan() {
+		line_text := scanner.Text()
+		if re_pattern.FindString(line_text) != "" {
+			res.LineIndexes = append(res.LineIndexes, cur_line_ind)
+			res.Lines = append(res.Lines, line_text)
+		}
+		cur_line_ind++
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+	out <- res
+	return nil
+}
+
+func main() {
+	path_pattern := "git/hook"
+	re_path_pattern, err := regexp.Compile(path_pattern)
+	if err != nil {
+		fmt.Printf("Unable to compile path pattern Regexp: %v\n", path_pattern)
+		return
+	}
+
+	text_pattern := "the commit"
+	re_text_pattern, err := regexp.Compile(text_pattern)
+	if err != nil {
+		fmt.Printf("Unable to compile text pattern Regexp: %v\n", text_pattern)
+		return
+	}
+	processed_channel := make(chan FileMatchData, CHANNEL_BUFFERING)
+	total_files := 0
+	err = filepath.Walk(".", func(path string, info fs.FileInfo, err error) error {
+		if err != nil {
+			fmt.Printf("prevent panic by handling failure accessing a path %q: %v\n", path, err)
+			return err
+		}
+		if re_path_pattern.FindString(path) == "" {
+			return nil
+		}
+		// if info.IsDir() && info.Name() == subDirToSkip {
+		// 	fmt.Printf("skipping a dir without errors: %+v \n", info.Name())
+		// 	return filepath.SkipDir
+		// }
+		if info.IsDir() {
+			return nil
+		}
+		go ProcessSingleFile(*re_text_pattern, path, processed_channel)
+		total_files++
+
+		return nil
+	})
+	for ; total_files > 0; total_files-- {
+		cur_processed := <-processed_channel
+		if len(cur_processed.Lines) == 0 {
+			continue
+		}
+		fmt.Printf("%s:\n", cur_processed.Path)
+		for i := 0; i < len(cur_processed.Lines); i++ {
+			fmt.Printf("%d:%s\n", cur_processed.LineIndexes[i], cur_processed.Lines[i])
+		}
+		fmt.Print("\n")
+	}
+
+	if err != nil {
+		fmt.Printf("error walking the path %q: %v\n", path_pattern, err)
+		return
+	}
+}