limit json flag to ls and updated commands

README.md

@@ -455,7 +455,7 @@ $ lerna ls
 
 List all of the public packages in the current Lerna repo.
 
-`lerna ls` respects the `--ignore`, `--scope`, and `--json` flags (see [Flags](#flags)).
+`lerna ls` respects the `--ignore` and `--scope` flags (see [Flags](#flags)).
 
 #### --json
 

src/Command.js

@@ -62,14 +62,6 @@ export const builder = {
     describe: "Set max-buffer(bytes) for Command execution",
     type: "number",
     requiresArg: true
-  },
-  "json": {
-    describe: dedent`
-      Returns output as a machine-readable json object
-      (Only for 'ls' and 'updated' commands)
-    `,
-    type: "boolean",
-    default: false
   }
 };
 
@@ -78,11 +70,6 @@ export default class Command {
     log.pause();
     log.heading = "lerna";
 
-    // Default to silent log level for JSON output
-    if (flags.json) {
-      log.level = "silent";
-    }
-
     if (flags.loglevel) {
       log.level = flags.loglevel;
     }

src/commands/LsCommand.js

@@ -12,7 +12,13 @@ export const command = "ls";
 
 export const describe = "List all public packages";
 
-export const builder = {};
+export const builder = {
+  "json": {
+    describe: "Show information in JSON format",
+    group: "Command Options:",
+    type: "boolean"
+  }
+};
 
 export default class LsCommand extends Command {
   get requiresGit() {

src/commands/UpdatedCommand.js

@@ -1,10 +1,23 @@
+import _ from "lodash";
 import chalk from "chalk";
 
 import { builder as publishOptions } from "./PublishCommand";
 import Command from "../Command";
 import output from "../utils/output";
 import UpdatedPackagesCollector from "../UpdatedPackagesCollector";
 
+const updatedOptions = _.assign(
+  {},
+  publishOptions,
+  {
+    "json": {
+      describe: "Show information in JSON format",
+      group: "Command Options:",
+      type: "boolean"
+    }
+  }
+);
+
 export function handler(argv) {
   return new UpdatedCommand(argv._, argv).run();
 }
@@ -13,7 +26,7 @@ export const command = "updated";
 
 export const describe = "Check which packages have changed since the last publish.";
 
-export const builder = (yargs) => yargs.options(publishOptions);
+export const builder = (yargs) => yargs.options(updatedOptions);
 
 export default class UpdatedCommand extends Command {
   initialize(callback) {