lsh: fix strings in PowerShell

crates/edit/src/buffer/mod.rs

@@ -2150,6 +2150,7 @@ impl TextBuffer {
                     HighlightKind::MarkupList => Some(IndexedColor::BrightBlue),
                     HighlightKind::MarkupStrikethrough => None,
                     HighlightKind::MetaHeader => Some(IndexedColor::BrightBlue),
+                    HighlightKind::Invalid => None,
                 };
                 let attr = match curr.kind {
                     HighlightKind::MarkupBold => Some(Attributes::Bold),

crates/lsh-bin/src/main.rs

@@ -126,6 +126,8 @@ fn run_render(generator: lsh::compiler::Generator, path: &Path) -> anyhow::Resul
             "markup.strikethrough" => "\x1b[9m", // Strikethrough
             "meta.header" => "\x1b[94m",         // Bright Blue
 
+            "invalid" => "\x1b[41;97m",          // White on Red
+
             _ => {
                 unknown_kinds.push(hk.identifier.to_string());
                 ""

crates/lsh/definitions/powershell.lsh

@@ -17,21 +17,43 @@ pub fn powershell() {
         } else if /'/ {
             loop {
                 yield string;
-                if /\\./ {}
-                else if /'/ { yield string; break; }
+                if /'/ { yield string; break; }
                 await input;
             }
+        } else if /@'/ {
+            if /\s*$/ { // HereStrings must start at the end of the line
+                yield string;
+                loop {
+                    if /.*/ {}
+                    yield string;
+                    await input;
+                    if /'@/ {
+                        yield string;
+                        break;
+                    }
+                }
+            } else if /.*$/ {
+                yield invalid;
+            }
         } else if /@"/ {
-            loop {
+            if /\s*$/ { // HereStrings must start at the end of the line
                 yield string;
-                if /\\./ {}
-                else if /"@/ { yield string; break; }
-                await input;
+                loop {
+                    if /.*/ {}
+                    yield string;
+                    await input;
+                    if /"@/ {
+                        yield string;
+                        break;
+                    }
+                }
+            } else if /.*$/ {
+                yield invalid;
             }
         } else if /"/ {
             loop {
                 yield string;
-                if /\\./ {}
+                if /`./ {}
                 else if /"/ { yield string; break; }
                 await input;
             }