co-mono/packages/tui/test/terminal-image.test.ts

/**
 * Tests for terminal image detection and line handling
 */

import assert from "node:assert";
import { describe, it } from "node:test";
import { isImageLine } from "../src/terminal-image.js";

describe("isImageLine", () => {
	describe("iTerm2 image protocol", () => {
		it("should detect iTerm2 image escape sequence at start of line", () => {
			// iTerm2 image escape sequence: ESC ]1337;File=...
			const iterm2ImageLine = "\x1b]1337;File=size=100,100;inline=1:base64encodeddata==\x07";
			assert.strictEqual(isImageLine(iterm2ImageLine), true);
		});

		it("should detect iTerm2 image escape sequence with text before it", () => {
			// Simulating a line that has text then image data (bug scenario)
			const lineWithTextAndImage = "Some text \x1b]1337;File=size=100,100;inline=1:base64data==\x07 more text";
			assert.strictEqual(isImageLine(lineWithTextAndImage), true);
		});

		it("should detect iTerm2 image escape sequence in middle of long line", () => {
			// Simulate a very long line with image data in the middle
			const longLineWithImage =
				"Text before image..." + "\x1b]1337;File=inline=1:verylongbase64data==" + "...text after";
			assert.strictEqual(isImageLine(longLineWithImage), true);
		});

		it("should detect iTerm2 image escape sequence at end of line", () => {
			const lineWithImageAtEnd = "Regular text ending with \x1b]1337;File=inline=1:base64data==\x07";
			assert.strictEqual(isImageLine(lineWithImageAtEnd), true);
		});

		it("should detect minimal iTerm2 image escape sequence", () => {
			const minimalImageLine = "\x1b]1337;File=:\x07";
			assert.strictEqual(isImageLine(minimalImageLine), true);
		});
	});

	describe("Kitty image protocol", () => {
		it("should detect Kitty image escape sequence at start of line", () => {
			// Kitty image escape sequence: ESC _G
			const kittyImageLine = "\x1b_Ga=T,f=100,t=f,d=base64data...\x1b\\\x1b_Gm=i=1;\x1b\\";
			assert.strictEqual(isImageLine(kittyImageLine), true);
		});

		it("should detect Kitty image escape sequence with text before it", () => {
			// Bug scenario: text + image data in same line
			const lineWithTextAndKittyImage = "Output: \x1b_Ga=T,f=100;data...\x1b\\\x1b_Gm=i=1;\x1b\\";
			assert.strictEqual(isImageLine(lineWithTextAndKittyImage), true);
		});

		it("should detect Kitty image escape sequence with padding", () => {
			// Kitty protocol adds padding to escape sequences
			const kittyWithPadding = "  \x1b_Ga=T,f=100...\x1b\\\x1b_Gm=i=1;\x1b\\  ";
			assert.strictEqual(isImageLine(kittyWithPadding), true);
		});
	});

	describe("Bug regression tests", () => {
		it("should detect image sequences in very long lines (304k+ chars)", () => {
			// This simulates the crash scenario: a line with 304,401 chars
			// containing image escape sequences somewhere
			const base64Char = "A".repeat(100); // 100 chars of base64-like data
			const imageSequence = "\x1b]1337;File=size=800,600;inline=1:";

			// Build a long line with image sequence
			const longLine =
				"Text prefix " +
				imageSequence +
				base64Char.repeat(3000) + // ~300,000 chars
				" suffix";

			assert.strictEqual(longLine.length > 300000, true);
			assert.strictEqual(isImageLine(longLine), true);
		});

		it("should detect image sequences when terminal doesn't support images", () => {
			// The bug occurred when getImageEscapePrefix() returned null
			// isImageLine should still detect image sequences regardless
			const lineWithImage = "Read image file [image/jpeg]\x1b]1337;File=inline=1:base64data==\x07";
			assert.strictEqual(isImageLine(lineWithImage), true);
		});

		it("should detect image sequences with ANSI codes before them", () => {
			// Text might have ANSI styling before image data
			const lineWithAnsiAndImage = "\x1b[31mError output \x1b]1337;File=inline=1:image==\x07";
			assert.strictEqual(isImageLine(lineWithAnsiAndImage), true);
		});

		it("should detect image sequences with ANSI codes after them", () => {
			const lineWithImageAndAnsi = "\x1b_Ga=T,f=100:data...\x1b\\\x1b_Gm=i=1;\x1b\\\x1b[0m reset";
			assert.strictEqual(isImageLine(lineWithImageAndAnsi), true);
		});
	});

	describe("Negative cases - lines without images", () => {
		it("should not detect images in plain text lines", () => {
			const plainText = "This is just a regular text line without any escape sequences";
			assert.strictEqual(isImageLine(plainText), false);
		});

		it("should not detect images in lines with only ANSI codes", () => {
			const ansiText = "\x1b[31mRed text\x1b[0m and \x1b[32mgreen text\x1b[0m";
			assert.strictEqual(isImageLine(ansiText), false);
		});

		it("should not detect images in lines with cursor movement codes", () => {
			const cursorCodes = "\x1b[1A\x1b[2KLine cleared and moved up";
			assert.strictEqual(isImageLine(cursorCodes), false);
		});

		it("should not detect images in lines with partial iTerm2 sequences", () => {
			// Similar prefix but missing the complete sequence
			const partialSequence = "Some text with ]1337;File but missing ESC at start";
			assert.strictEqual(isImageLine(partialSequence), false);
		});

		it("should not detect images in lines with partial Kitty sequences", () => {
			// Similar prefix but missing the complete sequence
			const partialSequence = "Some text with _G but missing ESC at start";
			assert.strictEqual(isImageLine(partialSequence), false);
		});

		it("should not detect images in empty lines", () => {
			assert.strictEqual(isImageLine(""), false);
		});

		it("should not detect images in lines with newlines only", () => {
			assert.strictEqual(isImageLine("\n"), false);
			assert.strictEqual(isImageLine("\n\n"), false);
		});
	});

	describe("Mixed content scenarios", () => {
		it("should detect images when line has both Kitty and iTerm2 sequences", () => {
			const mixedLine = "Kitty: \x1b_Ga=T...\x1b\\\x1b_Gm=i=1;\x1b\\ iTerm2: \x1b]1337;File=inline=1:data==\x07";
			assert.strictEqual(isImageLine(mixedLine), true);
		});

		it("should detect image in line with multiple text and image segments", () => {
			const complexLine = "Start \x1b]1337;File=img1==\x07 middle \x1b]1337;File=img2==\x07 end";
			assert.strictEqual(isImageLine(complexLine), true);
		});

		it("should not falsely detect image in line with file path containing keywords", () => {
			// File path might contain "1337" or "File" but without escape sequences
			const filePathLine = "/path/to/File_1337_backup/image.jpg";
			assert.strictEqual(isImageLine(filePathLine), false);
		});
	});
});