fix(bin): get correct value from arg separated by equals

Fixes #431

bin/semver.js

@@ -37,8 +37,9 @@ const main = () => {
     let a = argv.shift()
     const indexOfEqualSign = a.indexOf('=')
     if (indexOfEqualSign !== -1) {
+      const value = a.slice(indexOfEqualSign + 1)
       a = a.slice(0, indexOfEqualSign)
-      argv.unshift(a.slice(indexOfEqualSign + 1))
+      argv.unshift(value)
     }
     switch (a) {
       case '-rv': case '-rev': case '--rev': case '--reverse':

tap-snapshots/test/bin/semver.js.test.cjs

@@ -305,7 +305,7 @@ exports[`test/bin/semver.js TAP inc tests > -i premajor 1.0.0 --preid=beta 1`] =
 Object {
   "code": 0,
   "err": "",
-  "out": "2.0.0-0\\n",
+  "out": "2.0.0-beta.0\\n",
   "signal": null,
 }
 `

test/bin/semver.js

@@ -60,3 +60,21 @@ t.test('coercing', t => Promise.all([
   ['not a version', '1.2.3', '-c'],
   ['not a version', '-c'],
 ].map(args => t.resolveMatchSnapshot(run(args), args.join(' ')))))
+
+t.test('args with equals', t => Promise.all([
+  [['--version', '1.2.3'], '1.2.3'],
+  [['--range', '1'], ['1.2.3'], ['2.3.4'], '1.2.3'],
+  [['--increment', 'major'], ['1.0.0'], '2.0.0'],
+  [['--increment', 'premajor'], ['--preid', 'beta'], ['1.0.0'], '2.0.0-beta.0'],
+].map(async (args) => {
+  const expected = args.pop()
+  const equals = args.map((a) => a.join('='))
+  const spaces = args.reduce((acc, a) => acc.concat(a), [])
+  const res1 = await run(equals)
+  const res2 = await run(spaces)
+  t.equal(res1.signal, null)
+  t.equal(res1.code, 0)
+  t.equal(res1.err, '')
+  t.equal(res1.out.trim(), expected)
+  t.strictSame(res1, res2, args.join(' '))
+})))