Add IfMsgBox command to one command code list (#307)

Co-authored-by: Mark Wiemer <7833360+mark-wiemer@users.noreply.github.com>
Closes #290

src/providers/formattingProvider.utils.ts

@@ -340,14 +340,15 @@ export function purify(original: string): string {
 export function nextLineIsOneCommandCode(text: string): boolean {
     /** Special keywords that can trigger one-line commands */
     const oneCommandList = [
-        'ifnotexist',
         'ifexist',
+        'ifinstring',
+        'ifmsgbox',
+        'ifnotexist',
+        'ifnotinstring',
         'ifwinactive',
-        'ifwinnotactive',
         'ifwinexist',
+        'ifwinnotactive',
         'ifwinnotexist',
-        'ifinstring',
-        'ifnotinstring',
         'if',
         'else',
         'loop',

src/test/suite/format/format.test.ts

@@ -65,6 +65,7 @@ const formatTests: FormatTest[] = [
     { filenameRoot: '255-style-k-and-r' },
     { filenameRoot: '255-style-mix' },
     { filenameRoot: '255-style-one-true-brace' },
+    { filenameRoot: '290-ifmsgbox' },
     { filenameRoot: '291-single-line-comment' },
     { filenameRoot: '316-if-object-continuation-section' },
     { filenameRoot: 'ahk-explorer' },

src/test/suite/format/samples/290-ifmsgbox.in.ahk

@@ -0,0 +1,7 @@
+; [Issue #255](https://github.com/vscode-autohotkey/ahkpp/issues/290)
+MsgBox, 4, , Would you like to continue?, 5 ; 5-second timeout.
+IfMsgBox, No
+Return ; User pressed the "No" button.
+IfMsgBox, Timeout
+Return ; i.e. Assume "No" if it timed out.
+; Otherwise, continue

src/test/suite/format/samples/290-ifmsgbox.out.ahk

@@ -0,0 +1,7 @@
+; [Issue #255](https://github.com/vscode-autohotkey/ahkpp/issues/290)
+MsgBox, 4, , Would you like to continue?, 5 ; 5-second timeout.
+IfMsgBox, No
+    Return ; User pressed the "No" button.
+IfMsgBox, Timeout
+    Return ; i.e. Assume "No" if it timed out.
+; Otherwise, continue