package envpath import ( "bytes" "fmt" "io/ioutil" "os" "path/filepath" "runtime" "strings" ) type envConfig struct { shell string shellDesc string home string rcFile string rcScript string loadFile string loadScript string } var confs []*envConfig func init() { home, err := os.UserHomeDir() if nil != err { panic(err) // Must get home directory } home = filepath.ToSlash(home) confs = []*envConfig{ &envConfig{ home: home, shell: "bash", shellDesc: "bourne-compatible shell (bash)", rcFile: ".bashrc", rcScript: "[ -s \"$HOME/.config/envman/load.sh\" ] && source \"$HOME/.config/envman/load.sh\"\n", loadFile: ".config/envman/load.sh", loadScript: "for x in ~/.config/envman/*.env; do\n\tsource \"$x\"\ndone\n", }, &envConfig{ home: home, shell: "zsh", shellDesc: "bourne-compatible shell (zsh)", rcFile: ".zshrc", rcScript: "[ -s \"$HOME/.config/envman/load.sh\" ] && source \"$HOME/.config/envman/load.sh\"\n", loadFile: ".config/envman/load.sh", loadScript: "for x in ~/.config/envman/*.env; do\n\tsource \"$x\"\ndone\n", }, &envConfig{ home: home, shell: "fish", shellDesc: "fish shell", rcFile: ".config/fish/config.fish", rcScript: "test -s \"$HOME/.config/envman/load.fish\"; and source \"$HOME/.config/envman/load.fish\"\n", loadFile: ".config/envman/load.fish", loadScript: "for x in ~/.config/envman/*.env\n\tsource \"$x\"\nend\n", }, } } func initializeShells(home string) error { envmand := filepath.Join(home, ".config/envman") err := os.MkdirAll(envmand, 0755) if nil != err { return err } var hasRC bool var nativeMatch *envConfig for i := range confs { c := confs[i] if os.Getenv("SHELL") == c.shell { nativeMatch = c } _, err := os.Stat(filepath.Join(home, c.rcFile)) if nil != err { continue } hasRC = true } // ensure rc if !hasRC { if nil == nativeMatch { return fmt.Errorf( "%q is not a recognized shell and found none of .bashrc, .zshrc, .config/fish/config.fish", os.Getenv("SHELL"), ) } // touch the rc file f, err := os.OpenFile(filepath.Join(home, nativeMatch.rcFile), os.O_CREATE|os.O_WRONLY, 0644) if nil != err { return err } if err := f.Close(); nil != err { return err } } // MacOS is special. It *requires* .bash_profile in order to read .bashrc if "darwin" == runtime.GOOS && "bash" == os.Getenv("SHELL") { if err := ensureBashProfile(home); nil != err { return err } } // // Bash (sh, dash, zsh, ksh) // // http://www.joshstaiger.org/archives/2005/07/bash_profile_vs.html for i := range confs { c := confs[i] err := c.maybeInitializeShell() if nil != err { return err } } return nil } func (c *envConfig) maybeInitializeShell() error { if _, err := os.Stat(filepath.Join(c.home, c.rcFile)); nil != err { if !os.IsNotExist(err) { fmt.Fprintf(os.Stderr, "%s\n", err) } return nil } changed, err := c.initializeShell() if nil != err { return err } if changed { fmt.Printf( "Detected %s shell and updated ~/%s\n", c.shellDesc, strings.TrimPrefix(c.rcFile, c.home), ) } return nil } func (c *envConfig) initializeShell() (bool, error) { if err := c.ensurePathsLoader(); err != nil { return false, err } // Get current config // ex: ~/.bashrc // ex: ~/.config/fish/config.fish b, err := ioutil.ReadFile(filepath.Join(c.home, c.rcFile)) if nil != err { return false, err } // For Windows, just in case s := strings.Replace(string(b), "\r\n", "\n", -1) // Looking to see if loader script has been added to rc file lines := strings.Split(strings.TrimSpace(s), "\n") for i := range lines { line := lines[i] if line == strings.TrimSpace(c.rcScript) { // indicate that it was not neccesary to change the rc file return false, nil } } // Open rc file to append and write f, err := os.OpenFile(filepath.Join(c.home, c.rcFile), os.O_APPEND|os.O_WRONLY, 0644) if err != nil { return false, err } // Generate our script script := fmt.Sprintf("# Generated for envpath. Do not edit.\n%s\n", c.rcScript) // If there's not a newline before our template, // include it in the template. We want nice things. n := len(lines) if "" != strings.TrimSpace(lines[n-1]) { script = "\n" + script } // Write and close the rc file if _, err := f.Write([]byte(script)); err != nil { return false, err } if err := f.Close(); err != nil { return true, err } // indicate that we have changed the rc file return true, nil } func (c *envConfig) ensurePathsLoader() error { loadFile := filepath.Join(c.home, c.loadFile) if _, err := os.Stat(loadFile); nil != err { // Write the loop file. For example: // $HOME/.config/envman/load.sh // $HOME/.config/envman/load.fish // TODO maybe don't write every time if err := ioutil.WriteFile( loadFile, []byte(fmt.Sprintf("# Generated for envpath. Do not edit.\n%s\n", c.loadScript)), os.FileMode(0755), ); nil != err { return err } fmt.Printf("Created %s\n", "~/"+c.loadFile) } return nil } // I think this issue only affects darwin users with bash as the default shell func ensureBashProfile(home string) error { profileFile := filepath.Join(home, ".bash_profile") // touch the profile file f, err := os.OpenFile(profileFile, os.O_CREATE|os.O_WRONLY, 0644) if nil != err { return err } if err := f.Close(); nil != err { return err } b, err := ioutil.ReadFile(profileFile) if !bytes.Contains(b, []byte(".bashrc")) { f, err := os.OpenFile(profileFile, os.O_APPEND|os.O_WRONLY, 0644) if nil != err { return err } sourceBashRC := "[ -s \"$HOME/.bashrc\" ] && source \"$HOME/.bashrc\"\n" b := []byte(fmt.Sprintf("# Generated for MacOS bash. Do not edit.\n%s\n", sourceBashRC)) _, err = f.Write(b) if nil != err { return err } fmt.Printf("Updated ~/.bash_profile to source ~/.bashrc\n") } return nil }