initial

Author: calebdoxsey

LICENSE

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+Copyright (c) 2015 Caleb Doxsey
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# penv
+`penv` permanently sets environment variables. It supports the following:
+
+* bash - entries are added to `~/.bashrc`
+* fish - entries are added to `~/.config/fish/config.fish`
+* windows - entries are added to the registry for the current user
+
+## Installation
+`penv` is both a library and a command. To use the library in your own code see
+(godoc.org/github.com/badgerodon/penv). For the command:
+
+    go get github.com/badgerodon/penv/...
+
+This creates a `penv` command. Here's its usage:
+
+    usage: penv [<flags>] <command> [<args> ...]
+
+    Permanently set/unset environment variables
+
+    Flags:
+      --help     Show help.
+      --version  Show application version.
+
+    Commands:
+      help [<command>...]
+        Show help.
+
+      set <name> <value>
+        Permanently NAME to VALUE in the environment
+
+      unset <name>
+        Permanently unset NAME in the environment
+
+      append <name> <value>
+        Permanently append VALUE to NAME in the environment
+
+## License
+MIT

bash_dao.go

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+package penv
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/mitchellh/go-ps"
+)
+
+var (
+	bashShell = &shell{
+		configFileName: filepath.Join(os.Getenv("HOME"), ".bashrc"),
+		commentSigil:   "#",
+		quote: func(value string) string {
+			r := strings.NewReplacer(
+				"\\", "\\\\",
+				"'", "\\'",
+				"\n", `'"\n"'`,
+				"\r", `'"\r"'`,
+			)
+			return "'" + r.Replace(value) + "'"
+		},
+		mkSet: func(sh *shell, nv NameValue) string {
+			return fmt.Sprintf(
+				"export %s=%s",
+				nv.Name, sh.quote(nv.Value),
+			)
+		},
+		mkAppend: func(sh *shell, nv NameValue) string {
+			return fmt.Sprintf(
+				"export %s=${%s}${%s:+:}%s",
+				nv.Name, nv.Name, nv.Name, sh.quote(nv.Value),
+			)
+		},
+		mkUnset: func(sh *shell, nv NameValue) string {
+			return fmt.Sprintf(
+				"unset %s",
+				nv.Name,
+			)
+		},
+	}
+)
+
+type (
+	bashOp struct {
+		op        string
+		nameValue NameValue
+	}
+	// BashDAO is a data access object for bash
+	BashDAO struct{}
+)
+
+func init() {
+	RegisterDAO(1000, func() bool {
+		pid := os.Getpid()
+		for pid > 0 {
+			p, err := ps.FindProcess(pid)
+			if err != nil || p == nil {
+				break
+			}
+			if p.Executable() == "fish" {
+				return false
+			}
+			if p.Executable() == "bash" {
+				return true
+			}
+			pid = p.PPid()
+		}
+		return false
+	}, bashShell)
+}

cmd/penv/main.go

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+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/golang-book/penv"
+
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+var help = `usage: penv command
+
+Where command is:
+  set     Set an environmental variable
+  unset   Unset an environmental variable
+`
+var helpSet = `usage: penv set [NAME=VALUE]...
+Permanently set each NAME to VALUE in the environment.
+`
+var helpUnset = `usage: penv unset [NAME]...
+Permanently unset each NAME in the environment. Only variables added by
+'set' can be 'unset'.
+`
+
+func main() {
+	log.SetFlags(0)
+
+	app := kingpin.New("penv", "Permanently set/unset environment variables")
+	app.Version("1.0")
+
+	setcmd := app.Command("set", "Permanently NAME to VALUE in the environment")
+	setcmdName := setcmd.Arg("name", "environment variable name").Required().String()
+	setcmdValue := setcmd.Arg("value", "environment variable value").Required().String()
+
+	unsetcmd := app.Command("unset", "Permanently unset NAME in the environment")
+	unsetcmdName := unsetcmd.Arg("name", "environment variable name").Required().String()
+
+	appendcmd := app.Command("append", "Permanently append VALUE to NAME in the environment")
+	appendcmdName := appendcmd.Arg("name", "environment variable name").Required().String()
+	appendcmdValue := appendcmd.Arg("value", "environment vairable value").Required().String()
+
+	var err error
+	switch kingpin.MustParse(app.Parse(os.Args[1:])) {
+	case setcmd.FullCommand():
+		err = penv.SetEnv(*setcmdName, *setcmdValue)
+	case unsetcmd.FullCommand():
+		err = penv.UnsetEnv(*unsetcmdName)
+	case appendcmd.FullCommand():
+		err = penv.AppendEnv(*appendcmdName, *appendcmdValue)
+	}
+	if err != nil {
+		log.Fatalln(err)
+	}
+}

fish_dao.go

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+package penv
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"github.com/mitchellh/go-ps"
+)
+
+var (
+	fishShell = &shell{
+		configFileName: filepath.Join(os.Getenv("HOME"), ".config", "fish", "config.fish"),
+		commentSigil:   "#",
+		quote: func(value string) string {
+			r := strings.NewReplacer(
+				"\\", "\\\\",
+				"'", "\\'",
+				"\n", `'"\n"'`,
+				"\r", `'"\r"'`,
+			)
+			return "'" + r.Replace(value) + "'"
+		},
+		mkSet: func(sh *shell, nv NameValue) string {
+			return fmt.Sprintf(
+				"set -Ux %s %s",
+				nv.Name, sh.quote(nv.Value),
+			)
+		},
+		mkAppend: func(sh *shell, nv NameValue) string {
+			return fmt.Sprintf(
+				"set -Ux %s $%s %s",
+				nv.Name, nv.Name, sh.quote(nv.Value),
+			)
+		},
+		mkUnset: func(sh *shell, nv NameValue) string {
+			return fmt.Sprintf(
+				"set -Ue %s",
+				nv.Name,
+			)
+		},
+	}
+)
+
+type fishReloader struct{ DAO }
+
+func (fw fishReloader) Save(env *Environment) error {
+	err := fw.DAO.Save(env)
+	if err != nil {
+		return err
+	}
+	return exec.Command("fish", "-c", "echo hi").Run()
+}
+
+func init() {
+	RegisterDAO(1000, func() bool {
+		pid := os.Getpid()
+		for pid > 0 {
+			p, err := ps.FindProcess(pid)
+			if err != nil || p == nil {
+				break
+			}
+			switch p.Executable() {
+			case "fish":
+				return true
+			case "bash":
+				return false
+			case "zsh":
+				return false
+			}
+			pid = p.PPid()
+		}
+		return false
+	}, fishReloader{fishShell})
+}