Replace StringRange w/ an actual StrRVal + more command implementations

src/vm/commands/line.ts

@@ -1,6 +1,11 @@
-import {Command, CommandData, ParseContext, StrLVal} from "./command.js";
+import {Command, CommandData, ParseContext} from "./command.js";
 import {Executable} from "../parse.js";
 import {LexInput} from "../lexer.js";
+import {StrVM} from "../vm.js";
+import {Awaitable} from "../../util/types.js";
+import {Lines} from "./lines.js";
+import {Each} from "./each.js";
+import {Join} from "./join.js";
 
 export type LineData = {
     exec: Executable<CommandData>,
@@ -20,4 +25,16 @@ export class Line extends Command<LineData> {
     isParseCandidate(token: LexInput): boolean {
         return this.isKeyword(token, 'line')
     }
+
+    execute(vm: StrVM, data: LineData): Awaitable<StrVM> {
+        // `line <cmd>` is equivalent to `lines` -> `each <cmd>` -> `join`, so just do that
+        return vm.tapInPlace(ctx =>
+            ctx.replaceSubject(async sub =>
+                vm.runInChild(async (child, ctx) => {
+                    await (new Lines).execute(child, {})
+                    await (new Each).execute(child, { exec: data.exec })
+                    await (new Join).execute(child, {})
+                    return ctx.getSubject()
+                })))
+    }
 }