@struktoai/mirage-core/dist/workspace/executor/builtins/echo/echo.js

A Unified Virtual Filesystem For AI Agents

// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
import { ECHO_OPTION } from "../../../../commands/spec/constants.js";
import { IOResult } from "../../../../io/types.js";
import { encodeText } from "../../../../shell/bytes.js";
import { ExecutionNode } from "../../../types.js";
import { interpretEscapes } from "./escapes.js";
/**
 * Print arguments, honoring GNU echo's option rules.
 *
 * GNU echo is not getopt: options are LEADING words matching `-[neE]+`
 * only. The first word that does not match (including `-x` or a
 * repeated `hi -n`) ends option parsing and prints literally. Within
 * clusters the last of -e/-E wins; -n sticks. Under -e a `\c` ends the
 * output where it stands, newline included.
 */
export function handleEcho(args) {
    let noNewline = false;
    let escapes = false;
    let idx = 0;
    for (const word of args) {
        if (!ECHO_OPTION.test(word))
            break;
        for (const ch of word.slice(1)) {
            if (ch === 'n')
                noNewline = true;
            else if (ch === 'e')
                escapes = true;
            else
                escapes = false;
        }
        idx += 1;
    }
    let text = args.slice(idx).join(' ');
    let stop = false;
    if (escapes)
        [text, stop] = interpretEscapes(text);
    if (!noNewline && !stop)
        text += '\n';
    const out = encodeText(text);
    return [out, new IOResult(), new ExecutionNode({ command: 'echo', exitCode: 0 })];
}
/** The `echo` arm. */
export function echoBuiltin(call) {
    return Promise.resolve(handleEcho([...call.argv.args]));
}
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