Merge pull request #112 from tree-sitter/mj-until

Add support for 'until' loops

corpus/statements.txt

@@ -53,6 +53,26 @@ done
 
 ---
 
+(program
+  (while_statement
+    condition: (command
+      name: (command_name (word))
+      argument: (word))
+    body: (do_group
+      (command name: (command_name (word)) argument: (word))
+      (command name: (command_name (word)) argument: (word)))))
+
+====================================
+Until statements
+====================================
+
+until something happens; do
+  echo a
+  echo b
+done
+
+---
+
 (program
   (while_statement
     condition: (command

grammar.js

@@ -141,7 +141,7 @@ module.exports = grammar({
     ),
 
     while_statement: $ => seq(
-      'while',
+      choice('while', 'until'),
       field('condition', $._terminated_statement),
       field('body', $.do_group)
     ),

src/grammar.json

@@ -433,8 +433,17 @@
       "type": "SEQ",
       "members": [
         {
-          "type": "STRING",
-          "value": "while"
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "while"
+            },
+            {
+              "type": "STRING",
+              "value": "until"
+            }
+          ]
         },
         {
           "type": "FIELD",

src/node-types.json

@@ -1639,6 +1639,10 @@
     "type": "unsetenv",
     "named": false
   },
+  {
+    "type": "until",
+    "named": false
+  },
   {
     "type": "variable_name",
     "named": true