[New] parse: Add syntax support for duplicating input file descriptors

ljharb · Jan 29, 2023 · 216b198 · 216b198
1 parent c5549fc
commit 216b198
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Showing 2 changed files with 14 additions and 1 deletion.
diff --git a/parse.js b/parse.js
@@ -3,7 +3,7 @@
 // '<(' is process substitution operator and
 // can be parsed the same as control operator
 var CONTROL = '(?:' + [
-	'\\|\\|', '\\&\\&', ';;', '\\|\\&', '\\<\\(', '>>', '>\\&', '[&;()|<>]'
+	'\\|\\|', '\\&\\&', ';;', '\\|\\&', '\\<\\(', '>>', '>\\&', '<\\&', '[&;()|<>]'
 ].join('|') + ')';
 var META = '|&;()<> \\t';
 var BAREWORD = '(\\\\[\'"' + META + ']|[^\\s\'"' + META + '])+';

diff --git a/test/op.js b/test/op.js
@@ -69,6 +69,19 @@ test('double operators', function (t) {
 	t.end();
 });
 
+test('duplicating input file descriptors', function (t) {
+	// duplicating stdout to file descriptor 3
+	t.same(parse('beep 3<&1'), ['beep', '3', { op: '<&' }, '1']);
+
+	// duplicating stdout to file descriptor 0, i.e. stdin
+	t.same(parse('beep <&1'), ['beep', { op: '<&' }, '1']);
+
+	// closes stdin
+	t.same(parse('beep <&-'), ['beep', { op: '<&' }, '-']);
+
+	t.end();
+});
+
 test('glob patterns', function (t) {
 	t.same(
 		parse('tap test/*.test.js'),