feat: add cmd.

Author: yanzihuan

diff.go

@@ -0,0 +1,24 @@
+// package diff diff.go.
+package diff
+
+import (
+	"log"
+
+	"github.com/lower-coder/go-git-diff/internal"
+	"github.com/lower-coder/go-git-diff/parser"
+)
+
+// GitDiffStaged parse the output of `git diff --staged`.
+//  @return *parser.Diff
+//  @return error
+func GitDiffStaged() (*parser.Diff, error) {
+	cmd := internal.NewCommand("git", "diff", "--staged")
+	output, err := cmd.Run()
+	if err != nil {
+		log.Printf("get diff staged failed, err = %+v", err)
+		return nil, err
+	}
+	diff := parser.NewDiff()
+	diff.Parse(output)
+	return diff, nil
+}

diff/constant.go

@@ -0,0 +1,76 @@
+// package internal command.go
+package internal
+
+import (
+	"bytes"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+// Command struct.
+type Command struct {
+	Name string
+	Args []string
+	env  []string
+	dir  string
+}
+
+// NewCommand new a Command instance.
+//  @param name
+//  @param args
+//  @return *Command
+func NewCommand(name string, args ...string) *Command {
+	return &Command{
+		Name: name,
+		Args: args,
+		env:  os.Environ(),
+		dir:  ".",
+	}
+}
+
+// SetDir set command workspace.
+//  @receiver c
+//  @param dir
+//  @return *cmd
+func (c *Command) SetDir(dir string) *Command {
+	c.dir = dir
+
+	return c
+}
+
+// AddEnv add an environment config.
+//  @receiver c
+//  @param env
+//  @return *Command
+func (c *Command) AddEnv(env []string) *Command {
+	c.env = append(c.env, env...)
+
+	return c
+}
+
+// Run command.
+//  @receiver c
+//  @return string
+//  @return error
+func (c *Command) Run() (string, error) {
+	stdout := new(bytes.Buffer)
+	stderr := new(bytes.Buffer)
+
+	e := exec.Command(c.Name, c.Args...)
+	log.Printf("exec command: %+v", e)
+
+	e.Env = c.env
+	e.Dir = c.dir
+	e.Stdout = stdout
+	e.Stderr = stderr
+
+	err := e.Run()
+	if err != nil {
+		log.Printf("exec command failed: err = %+v, stderr = %+v", err, stderr.String())
+		return "", err
+	}
+
+	return strings.Trim(stdout.String(), "\n"), nil
+}

internal/command.go

@@ -1,16 +1,17 @@
-// Package internal 正则表达式
+// Package internal regexp.go
 package internal
 
 import "regexp"
 
+// regexpT is a regexp template struct.
 type regexpT struct {
 	ChunkRegexp *regexp.Regexp
 }
 
-// RegexpT 正则表达式模版
+// RegexpT is a regexp template struct.
 var RegexpT *regexpT
 
-// InitRegexpT 初始化正则表达式模板
+// InitRegexpT init regexp template.
 func InitRegexpT() {
 	RegexpT = &regexpT{}
 

internal/regexp.go

@@ -1,5 +1,5 @@
-// Package diff diff块
-package diff
+// Package parser diff块
+package parser
 
 import (
 	"strings"

diff/chunk.go renamed to parser/chunk.go

@@ -0,0 +1,6 @@
+// Package parser 常量
+package parser
+
+const (
+	Space = " " // 空格
+)

parser/constant.go

@@ -1,5 +1,5 @@
-// Package diff 处理go语言git diff解析 `git diff source target`
-package diff
+// Package parser 处理go语言git diff解析 `git diff source target`
+package parser
 
 import (
 	"strings"

diff/diff.go renamed to parser/diff.go

@@ -1,5 +1,5 @@
-// Package diff 模块说明
-package diff
+// Package parser 模块说明
+package parser
 
 import (
 	"encoding/json"

diff/diff_test.go renamed to parser/diff_test.go

@@ -1,5 +1,5 @@
-// Package diff 输入数据源
-package diff
+// Package parser 输入数据源
+package parser
 
 import "strings"
 

diff/input.go renamed to parser/input.go

@@ -1,5 +1,5 @@
-// Package diff 图例
-package diff
+// Package parser 图例
+package parser
 
 import "strings"
 

diff/legend.go renamed to parser/legend.go

@@ -1,5 +1,5 @@
-// Package diff diff行
-package diff
+// Package parser diff行
+package parser
 
 const (
 	InsertPrefix = "+" // 新增行前缀

diff/line.go renamed to parser/line.go

@@ -1,5 +1,5 @@
-// Package diff 元数据
-package diff
+// Package parser 元数据
+package parser
 
 import "strings"