Add JSON output to sshc get

README.md

@@ -27,6 +27,20 @@ Host myremotehost
   IdentityFile %d/.ssh/rsa_key
 ```
 
+You can also optionally convert the host definition to JSON, with the following result:
+
+```
+$ sshc get -j myremotehost
+{
+  "HostName" "127.0.0.1",
+  "Port" "22",
+  "User" "delucks",
+  "IdentityFile" "%d/.ssh/rsa_key"
+}
+```
+
+This is useful for pulling out specific pieces of information using a json query tool like `jq`. For example, `sshc get -j myremotehost | jq .HostName` is a quick way of returning just the hostname field of an entry in your config file. I use this for constructing URLs on remote servers like `curl -s "http://$(sshc get -j myremotehost | jq .HostName):8080/path/index.html"`.
+
 You can find the names of all the host definitions in your file by using `sshc hosts`:
 
 ```
@@ -91,15 +105,3 @@ From **ssh-config**: I like this tool a lot and started off using it, but the la
 `sshc` is also novel in a couple ways:
 - Copying definitions from the local host to a remote `~/.ssh/config`
 - Choice of golang; small footprint & installation from a single binary
-
-The rest of this README is scratch space left over from planning.
-
-```
-$ sshc get -j hostname
-{"hostname": {
-  "HostName": "127.0.0.1",
-  "Port": "22",
-  "User": "delucks",
-  "IdentityFile": "%d/.ssh/rsa_key",
-}}
-```

sshc.go

@@ -1,21 +1,24 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
-	"github.com/kevinburke/ssh_config"
-	"github.com/spf13/cobra"
 	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"regexp"
 	"strings"
+
+	"github.com/kevinburke/ssh_config"
+	"github.com/spf13/cobra"
 )
 
 // Variables holding data for Cobra flags used in the command-line interface
 var (
 	UserConfigFile      string
 	CopyDestinationPath string
+	JSONOutput          bool
 	UseANSIColor        bool
 	RegexIgnoreCase     bool
 )
@@ -269,6 +272,23 @@ func RunGet(hostname string) error {
 	if hostdef == nil {
 		return ColorError("No matching hosts", Red)
 	}
+	if JSONOutput {
+		output := map[string]interface{}{}
+		for _, n := range hostdef.Nodes {
+			trimmed := strings.TrimLeft(n.String(), " \t")
+			if trimmed == "" {
+				continue
+			}
+			spl := strings.SplitN(trimmed, " ", 2)
+			output[spl[0]] = spl[1]
+		}
+		blob, err := json.MarshalIndent(output, "", "  ")
+		if err != nil {
+			return err
+		}
+		fmt.Printf("%s\n", blob)
+		return nil
+	}
 	fmt.Println(hostdef)
 	return nil
 }
@@ -293,6 +313,7 @@ func NewGetCommand() *cobra.Command {
 			}
 		},
 	}
+	get.Flags().BoolVarP(&JSONOutput, "json-output", "j", false, "Output this host in JSON format")
 	return get
 }