feat: support single dash as option value for long option

Author: shadowspawn

lib/yargs-parser.ts

@@ -274,7 +274,7 @@ export class YargsParser {
           } else {
             next = args[i + 1]
 
-            if (next !== undefined && (!next.match(/^-/) ||
+            if (next !== undefined && (!next.match(/^-./) ||
               next.match(negative)) &&
               !checkAllAliases(key, flags.bools) &&
               !checkAllAliases(key, flags.counts)) {

test/yargs-parser.mjs

@@ -1493,23 +1493,31 @@ describe('yargs-parser', function () {
   })
 
   describe('-', function () {
-    it('should set - as value of n', function () {
+    it('should set - as space separated value of n', function () {
       const argv = parser(['-n', '-'])
       argv.should.have.property('n', '-')
       argv.should.have.property('_').with.length(0)
     })
 
-    it('should set - as a non-hyphenated value', function () {
+    it('should set - as a non-hyphenated value (positional)', function () {
       const argv = parser(['-'])
       argv.should.have.property('_').and.deep.equal(['-'])
     })
 
-    it('should set - as a value of f', function () {
+    it('should set - as an embedded value of f', function () {
+      // special case dash trailing short option
       const argv = parser(['-f-'])
       argv.should.have.property('f', '-')
       argv.should.have.property('_').with.length(0)
     })
 
+    it('should set - as an embedded value of f with =', function () {
+      // usual style for embedded short option value
+      const argv = parser(['-f=-'])
+      argv.should.have.property('f', '-')
+      argv.should.have.property('_').with.length(0)
+    })
+
     it('should set b to true and set - as a non-hyphenated value when b is set as a boolean', function () {
       const argv = parser(['-b', '-'], {
         boolean: ['b']
@@ -1527,6 +1535,18 @@ describe('yargs-parser', function () {
       argv.should.have.property('s', '-')
       argv.should.have.property('_').with.length(0)
     })
+
+    it('should set - as space separated value of foo', function () {
+      const argv = parser(['--foo', '-'])
+      argv.should.have.property('foo', '-')
+      argv.should.have.property('_').with.length(0)
+    })
+
+    it('should set - as embedded value of foo', function () {
+      const argv = parser(['--foo=-'])
+      argv.should.have.property('foo', '-')
+      argv.should.have.property('_').with.length(0)
+    })
   })
 
   describe('count', function () {