add document and some improved

.gitignore

@@ -3,3 +3,4 @@ gopm
 *.exe
 *.exe~
 repos/
+vendor/

README.md

@@ -6,3 +6,66 @@ gopm - Go Package Manager
 gopm(Go Package Manager) is a Go package manage tool for search, install, update and share packages in Go.
 
 **Attention** This application still in experiment, we'are working on new break version, you may use [old version](https://github.com/gpmgo/gopm/tree/v0.1.0) for now.
+
+# Requirement
+
+Currently, gopm use soft syb link
+
+# INSTALL
+
+You should install Go and Go tool before install gopm currently.
+
+```
+go get github.com/gpmgo/gopm
+```
+
+This will install gopm on $GOPATH$/bin。Before using gopm, you should add this to $PATH.
+
+# Features
+
+* Don't need to install git, svn, hg etct. for installing packages.
+* Package has version
+* Every project has owner GOPATH
+* Put your Go project on anywhere you want
+
+# Commands
+
+1. Show the command help
+```
+gopm help
+```
+
+2. Show gopm version
+```
+gopm version
+```
+
+3. Get a package
+```
+gopm get github.com/gpmgo/gopm
+```
+
+4. Search a package
+```
+gopm search gopm
+```
+
+5. Build a project, the build's arguments are the same as go build. But it will check all the dependencies and dowload them.
+```
+<change to project directory>
+gopm build
+```
+
+6. Run a go file
+```
+<change to project directory>
+gopm run main.go
+```
+
+7. Install 
+```
+<change to project directory>
+gopm install
+```
+
+

cmd/cmd.go

@@ -20,6 +20,8 @@ import (
 	"strings"
 )
 
+const APP_VER = "0.5.0.1103"
+
 var (
 	AppPath  string
 	reposDir string = "~/.gopm/repos"
@@ -67,3 +69,20 @@ func (c *Command) Usage() {
 func (c *Command) Runnable() bool {
 	return c.Run != nil
 }
+
+var CmdVersion = &Command{
+	UsageLine: "version",
+	Short:     "show version",
+	Long: `
+show version
+`,
+}
+
+func runVersion(cmd *Command, args []string) {
+	fmt.Println(APP_VER)
+}
+
+func init() {
+	CmdVersion.Run = runVersion
+	CmdVersion.Flags = map[string]bool{}
+}

cmd/gopath.go

@@ -179,6 +179,12 @@ func genNewGoPath() {
 			com.ColorLog("[ERRO] make link error %v\n", err)
 			return
 		}
+		com.ColorLog("[INFO] change dir to %v\n", newPath)
+		err = os.Chdir(newPath)
+		if err != nil {
+			com.ColorLog("[ERRO] change current directory error %v\n", err)
+			return
+		}
 	}
 
 	com.ColorLog("[TRAC] set GOPATH=%v\n", newGoPath)

gopm.go

@@ -33,7 +33,6 @@ import (
 
 // Test that go1.1 tag above is included in builds. main.go refers to this definition.
 const go11tag = true
-const APP_VER = "0.4.0.1012"
 
 var (
 	config map[string]interface{}
@@ -48,6 +47,7 @@ var commands = []*cmd.Command{
 	cmd.CmdGen,
 	cmd.CmdBuild,
 	cmd.CmdRun,
+	cmd.CmdVersion,
 	/*cmd.CmdInstall,
 
 	cmdClean,
@@ -58,7 +58,6 @@ var commands = []*cmd.Command{
 	cmdList,
 	cmdTest,
 	cmdTool,
-	cmdVersion,
 	cmdVet,
 
 	helpGopath,