feat(view): add 'view' command (#27)

* feat(view): add a first draft of `tink view`

* fix(view): move to jsx, register command

Move to use JSX and use register command.

* fix(view): use common opts

* style(view): use jsx, improve components

* fix(view): fix error handling

* fix(view): fix dist-tag handling

* fix(view): use libnpm instead of npa

* fix(view): improve error handling

* feat(view): allow unlimited items for specified fields

Allow unlimited items when field is specified.

* feat(view): add packument info

Add packument info to outputted JSON, as is custom in `npm view`. It's a 
bit double if multiple versions are queried, but that's just how it is. 
Also allows packument-specific props to be queried.

* feat(view): allow dots in props

Allow dots (.) in props with a special prop syntax:

Data:
    { foo: {
      'bar.baz': 1,
      bar: { baz: 2 }
    } }

Query:
    foo[bar.baz] // -> 1

Useful to query versions, deps:

    time[0.10.1]
    dependencies[lodash.uniq]

* fix(view): properly show error stack

* feat(view): show deps as columns

Show dependencies in columns, matching the old behaviour.

* chore(git): clean merge conflict

bin/tink.js

@@ -9,7 +9,8 @@ const CMDS = new Map([
   ['org', require('../lib/commands/org.jsx')],
   ['prepare', require('../lib/commands/prepare.js')],
   ['ping', require('../lib/commands/ping.js')],
-  ['deprecate', require('../lib/commands/deprecate.js')]
+  ['deprecate', require('../lib/commands/deprecate.js')],
+  ['view', require('../lib/commands/view.js')]
 ])
 
 if (require.main === module) {

lib/commands/view.js

@@ -0,0 +1,51 @@
+'use strict'
+
+const npmlog = require('npmlog')
+const libnpm = require('libnpm')
+
+const { h, renderToString } = require('ink')
+const { PackageView, PackageFields } = require('../components/view.jsx')
+
+const View = module.exports = {
+  command: 'view [<pkg>[@<version>]] [<field>...]',
+  aliases: ['v', 'info', 'show'],
+  describe: 'Show information about a package',
+  builder (yargs) {
+    return yargs.help().alias('help', 'h').options(View.options)
+  },
+  options: Object.assign(require('../common-opts'), {}),
+  handler: view
+}
+
+async function view (argv) {
+  npmlog.heading = 'tink'
+
+  let { 'pkg@version': spec, field: fields } = argv
+
+  if (!spec) { spec = '.' }
+  if (!fields) { fields = [] }
+
+  let packument = await libnpm.packument(spec, Object.assign({}, argv, {
+    fullMetadata: true,
+    log: npmlog
+  }))
+  let { rawSpec } = libnpm.parseArg(spec)
+
+  let options = {
+    packument,
+    fields,
+    spec: rawSpec && rawSpec !== '.' ? rawSpec : null,
+    json: argv.json
+  }
+
+  try {
+    let view = h(
+      fields.length ? PackageFields : PackageView,
+      options
+    )
+    console.log(renderToString(view))
+  } catch (e) {
+    npmlog.error('view', e.message)
+    npmlog.error('view', e.stack)
+  }
+}