commit f3d6a21d8f5a704819507b6c650a6380f9501009
Author: dengqn <434500374@qq.com>
Date:   Thu Aug 29 11:47:32 2024 +0800

    cmt

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c2bfce7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# list version
+
+manage file version caches
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2a259d7
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.dengqn.com/dqn/listversion
+
+go 1.20
diff --git a/list_version.go b/list_version.go
new file mode 100644
index 0000000..721b578
--- /dev/null
+++ b/list_version.go
@@ -0,0 +1,143 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"git.dengqn.com/dqn/listversion/storage"
+	"git.dengqn.com/dqn/listversion/util"
+)
+
+func main() {
+
+	op := "h"
+	if len(os.Args) > 1 {
+		op = os.Args[1]
+	}
+	// for idx, arg := range os.Args {
+	// 	fmt.Printf("%d: %s\n", idx, arg)
+	// }
+
+	switch op {
+	case "h":
+		h()
+		break
+	case "l":
+		ls()
+		break
+	case "a":
+		add()
+		break
+	case "d":
+		del()
+	case "r":
+		rec()
+		break
+	}
+}
+
+func h() {
+	fmt.Println("________________________________________________________")
+	fmt.Println("[h] print this")
+	fmt.Println("[l] list verisons. [lv l xx.txt]")
+	fmt.Println("[a] add file to cache. [lv a xx.txt xxx]")
+	fmt.Println("[d] remove version from cache. [lv d xx.txt 1]")
+	fmt.Println("[r] extract file version from cache. [lv r xx.txt 1]")
+	fmt.Println("--------------------------------------------------------")
+}
+
+func rec() {
+	// 获取绝对路径
+	// 获取绝对路径
+	fullPath, _ := filepath.Abs(os.Args[2])
+	ver := os.Args[3]
+
+	version, _ := strconv.ParseInt(ver, 10, 32)
+
+	meta, err := storage.GetVersionList(util.ToHashHex(fullPath))
+	if err != nil {
+		fmt.Println("err: ", err.Error())
+		return
+	}
+
+	for _, v := range meta.Versions {
+		func(vv storage.Version) {
+			if v.Version == version {
+				storage.Extract(fullPath, vv)
+			}
+		}(v)
+	}
+}
+
+func ls() {
+	// 获取绝对路径
+	fullPath, _ := filepath.Abs(os.Args[2])
+
+	meta, err := storage.GetVersionList(util.ToHashHex(fullPath))
+	if err != nil {
+		fmt.Println("err: ", err.Error())
+		return
+	}
+	fmt.Printf("[%s]\n______________________\n", meta.FileName)
+	for _, v := range meta.Versions {
+		fmt.Printf("[%d].%s\t%s\n", v.Version, time.UnixMilli(v.Created).Format("2006-01-02 15:04:05"), v.Desc)
+	}
+}
+
+func add() {
+	// xxx add xx "asdasd"
+	fullPath, _ := filepath.Abs(os.Args[2])
+	msg := os.Args[3]
+
+	meta, err := storage.GetVersionList(util.ToHashHex(fullPath))
+	if err != nil {
+		// 新的
+		meta = storage.NewMeta(fullPath)
+	}
+
+	max := int64(0)
+	for _, v := range meta.Versions {
+		if v.Version > int64(max) {
+			max = v.Version
+		}
+	}
+
+	meta.Versions = append(meta.Versions, storage.Version{
+		Desc:    msg,
+		Created: time.Now().UnixMilli(),
+		Version: max + 1,
+	})
+	storage.SaveMeta(util.ToHashHex(fullPath), meta)
+	storage.CopyData(fullPath, meta.Versions[len(meta.Versions)-1])
+	fmt.Println("version copied")
+}
+
+func del() {
+	// 获取绝对路径
+	fullPath, _ := filepath.Abs(os.Args[2])
+	ver := os.Args[3]
+
+	version, _ := strconv.ParseInt(ver, 10, 32)
+
+	meta, err := storage.GetVersionList(util.ToHashHex(fullPath))
+	if err != nil {
+		fmt.Println("err: ", err.Error())
+		return
+	}
+
+	tmp := make([]storage.Version, 0)
+	for _, v := range meta.Versions {
+		func(vv storage.Version) {
+			if vv.Version != version {
+				tmp = append(tmp, vv)
+			} else {
+				storage.DeleteData(fullPath, vv)
+			}
+		}(v)
+	}
+	meta.Versions = tmp
+	storage.SaveMeta(util.ToHashHex(fullPath), meta)
+}
diff --git a/storage/version.go b/storage/version.go
new file mode 100644
index 0000000..775f431
--- /dev/null
+++ b/storage/version.go
@@ -0,0 +1,149 @@
+package storage
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"strconv"
+
+	"git.dengqn.com/dqn/listversion/util"
+)
+
+/**
+VersionMeta
+
+data root --> file path bash	/
+								/ file version1
+								/ file version2
+								/ meta.json --> VersionMeta[]
+		  --> other config.json
+*/
+
+type FileMeta struct {
+	FileName     string    `json:"fileName"`
+	AbsolutePath string    `json:"absolutePath"`
+	NameHash     string    `json:"nameHash"`
+	Versions     []Version `json:"versions"`
+}
+
+type Version struct {
+	Version int64  `json:"version"`
+	Created int64  `json:"created"`
+	Desc    string `json:"desc"`
+}
+
+func Extract(fullPath string, version Version) {
+	root, _ := os.UserConfigDir()
+	pathHex := util.ToHashHex(fullPath)
+	os.Remove(fullPath)
+	origin, _ := os.OpenFile(fullPath, os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	target, _ := os.OpenFile(path.Join(root, "list-version", pathHex, strconv.FormatInt(version.Version, 10)), os.O_RDONLY, os.ModePerm)
+	io.Copy(origin, target)
+	origin.Close()
+	target.Close()
+}
+
+func SaveMeta(pathHex string, meta FileMeta) {
+	root, _ := os.UserConfigDir()
+
+	appRoot, err := os.Open(path.Join(root, "list-version"))
+	if err != nil {
+		fmt.Println("%s", "打开文件失败0"+err.Error())
+		if errors.Is(err, os.ErrNotExist) {
+			os.Mkdir(path.Join(root, "list-version"), os.ModePerm)
+		}
+	}
+
+	defer func() {
+		if appRoot != nil {
+			appRoot.Close()
+		}
+	}()
+
+	_, err = os.Open(path.Join(root, "list-version", pathHex))
+	// not saved yet
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			os.Mkdir(path.Join(root, "list-version", pathHex), os.ModePerm)
+		}
+	}
+
+	os.Remove(path.Join(root, "list-version", pathHex, "meta.json.bak"))
+	os.Rename(path.Join(root, "list-version", pathHex, "meta.json"), path.Join(root, "list-version", pathHex, "meta.json.bak"))
+	// meta.json
+	metaJsonFile, err := os.OpenFile(path.Join(root, "list-version", pathHex, "meta.json"), os.O_WRONLY, os.ModePerm)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			// 直接写
+			metaJsonFile, err = os.Create(path.Join(root, "list-version", pathHex, "meta.json"))
+		}
+	}
+	buf, err := json.Marshal(meta)
+	if err != nil {
+		fmt.Println("%s", "json"+err.Error())
+	}
+	metaJsonFile.Write(buf)
+	metaJsonFile.Sync()
+	metaJsonFile.Close()
+}
+
+func DeleteData(originFile string, version Version) {
+	root, _ := os.UserConfigDir()
+	pathHex := util.ToHashHex(originFile)
+	os.Remove(path.Join(root, "list-version", pathHex, strconv.FormatInt(version.Version, 10)))
+}
+
+func CopyData(originFile string, version Version) {
+	root, _ := os.UserConfigDir()
+	pathHex := util.ToHashHex(originFile)
+
+	origin, _ := os.OpenFile(originFile, os.O_RDONLY, os.ModePerm)
+	target, _ := os.Create(path.Join(root, "list-version", pathHex, strconv.FormatInt(version.Version, 10)))
+	io.Copy(target, origin)
+	origin.Close()
+	target.Close()
+}
+
+func GetVersionList(pathHex string) (meta FileMeta, err error) {
+
+	root, _ := os.UserConfigDir()
+
+	appRoot, err := os.Open(path.Join(root, "list-version"))
+	if errors.Is(err, os.ErrNotExist) {
+		os.Mkdir(path.Join(root, "list-version"), os.ModePerm)
+	}
+	defer func() {
+		if appRoot != nil {
+			appRoot.Close()
+		}
+	}()
+
+	fileMeta, err := os.Open(path.Join(root, "list-version", pathHex, "meta.json"))
+	// not saved yet
+	if errors.Is(err, os.ErrNotExist) {
+		return meta, errors.New("no versions")
+	}
+	defer fileMeta.Close()
+	// read meta.json
+
+	buf, _ := io.ReadAll(fileMeta)
+	json.Unmarshal(buf, &meta)
+
+	return meta, nil
+}
+
+func NewMeta(filePath string) (meta FileMeta) {
+
+	meta.AbsolutePath = filePath
+
+	st, _ := os.Stat(filePath)
+
+	meta.FileName = st.Name()
+	meta.NameHash = util.ToHashHex(filePath)
+	meta.Versions = make([]Version, 0)
+
+	return meta
+}
diff --git a/util/hash.go b/util/hash.go
new file mode 100644
index 0000000..abc2229
--- /dev/null
+++ b/util/hash.go
@@ -0,0 +1,12 @@
+package util
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+)
+
+func ToHashHex(filePath string) string {
+	s1 := sha1.New()
+	buf := s1.Sum([]byte(filePath))
+	return hex.EncodeToString(buf)
+}