From 7228c8fe486b539ab3ba7961c22d6639093ad7b6 Mon Sep 17 00:00:00 2001
From: Matt Bell <mappum@gmail.com>
Date: Wed, 5 Nov 2014 16:22:47 -0800
Subject: [PATCH] core/commands2: Added 'config' command

---
 core/commands2/config.go | 188 +++++++++++++++++++++++++++++++++++++++
 core/commands2/root.go   |   1 +
 2 files changed, 189 insertions(+)
 create mode 100644 core/commands2/config.go

diff --git a/core/commands2/config.go b/core/commands2/config.go
new file mode 100644
index 000000000..1eaf2332d
--- /dev/null
+++ b/core/commands2/config.go
@@ -0,0 +1,188 @@
+package commands
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+
+	cmds "github.com/jbenet/go-ipfs/commands"
+	config "github.com/jbenet/go-ipfs/config"
+)
+
+type ConfigField struct {
+	Key   string
+	Value interface{}
+}
+
+var configCmd = &cmds.Command{
+	Arguments: []cmds.Argument{
+		cmds.Argument{"key", cmds.ArgString, true, false},
+		cmds.Argument{"value", cmds.ArgString, false, false},
+	},
+	Help: `ipfs config <key> [value] - Get/Set ipfs config values.
+
+    ipfs config <key>          - Get value of <key>
+    ipfs config <key> <value>  - Set value of <key> to <value>
+    ipfs config show           - Show config file
+    ipfs config edit           - Edit config file in $EDITOR
+
+Examples:
+
+  Get the value of the 'datastore.path' key:
+
+      ipfs config datastore.path
+
+  Set the value of the 'datastore.path' key:
+
+      ipfs config datastore.path ~/.go-ipfs/datastore
+
+`,
+	Run: func(res cmds.Response, req cmds.Request) {
+		args := req.Arguments()
+
+		key, ok := args[0].(string)
+		if !ok {
+			res.SetError(errors.New("cast error"), cmds.ErrNormal)
+			return
+		}
+
+		filename, err := config.Filename(req.Context().ConfigRoot)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		var value string
+		if len(args) == 2 {
+			var ok bool
+			value, ok = args[1].(string)
+			if !ok {
+				res.SetError(errors.New("cast error"), cmds.ErrNormal)
+				return
+			}
+
+			field, err := setConfig(filename, key, value)
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+
+			res.SetOutput(field)
+			return
+
+		} else {
+			field, err := getConfig(filename, key)
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+
+			res.SetOutput(field)
+			return
+		}
+	},
+	Marshallers: map[cmds.EncodingType]cmds.Marshaller{
+		cmds.Text: func(res cmds.Response) ([]byte, error) {
+			v := res.Output().(*ConfigField)
+
+			s := ""
+			if len(res.Request().Arguments()) == 2 {
+				s += fmt.Sprintf("'%s' set to: ", v.Key)
+			}
+
+			marshalled, err := json.Marshal(v.Value)
+			if err != nil {
+				return nil, err
+			}
+			s += fmt.Sprintf("%s\n", marshalled)
+
+			return []byte(s), nil
+		},
+	},
+	Type: &ConfigField{},
+	Subcommands: map[string]*cmds.Command{
+		"show": configShowCmd,
+		"edit": configEditCmd,
+	},
+}
+
+var configShowCmd = &cmds.Command{
+	Run: func(res cmds.Response, req cmds.Request) {
+		filename, err := config.Filename(req.Context().ConfigRoot)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		reader, err := showConfig(filename)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		res.SetOutput(reader)
+	},
+}
+
+var configEditCmd = &cmds.Command{
+	Run: func(res cmds.Response, req cmds.Request) {
+		filename, err := config.Filename(req.Context().ConfigRoot)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		err = editConfig(filename)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+	},
+}
+
+func getConfig(filename string, key string) (*ConfigField, error) {
+	value, err := config.ReadConfigKey(filename, key)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to get config value: %s", err)
+	}
+
+	return &ConfigField{
+		Key:   key,
+		Value: value,
+	}, nil
+}
+
+func setConfig(filename string, key, value string) (*ConfigField, error) {
+	err := config.WriteConfigKey(filename, key, value)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to set config value: %s", err)
+	}
+
+	return getConfig(filename, key)
+}
+
+func showConfig(filename string) (io.Reader, error) {
+	// MAYBE_TODO: maybe we should omit privkey so we don't accidentally leak it?
+
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	//defer file.Close()
+
+	return file, nil
+}
+
+func editConfig(filename string) error {
+	editor := os.Getenv("EDITOR")
+	if editor == "" {
+		return errors.New("ENV variable $EDITOR not set")
+	}
+
+	cmd := exec.Command("sh", "-c", editor+" "+filename)
+	cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr
+	return cmd.Run()
+}
diff --git a/core/commands2/root.go b/core/commands2/root.go
index a17210d67..9238832d3 100644
--- a/core/commands2/root.go
+++ b/core/commands2/root.go
@@ -66,6 +66,7 @@ var rootSubcommands = map[string]*cmds.Command{
 	"pin":      pinCmd,
 	"unpin":    unpinCmd,
 	"version":  versionCmd,
+	"config":   configCmd,
 
 	// test subcommands
 	// TODO: remove these when we don't need them anymore