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repl: fix preview of lines that exceed the terminal columns
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This adds support for very long input lines to still display the
input preview correct.

PR-URL: #31006
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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@BridgeAR @targos
BridgeAR authored and targos committed Apr 28, 2020
1 parent f1624bb commit 85f8654
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Showing 3 changed files with 79 additions and 35 deletions.
29 changes: 15 additions & 14 deletions lib/internal/repl/utils.js
View file
Expand Up @@ -132,11 +132,19 @@ function setupPreview(repl, contextSymbol, bufferSymbol, active) {
let previewCompletionCounter = 0;
let completionPreview = null;

function getPreviewPos() {
const displayPos = repl._getDisplayPos(`${repl._prompt}${repl.line}`);
const cursorPos = repl._getCursorPos();
const rows = 1 + displayPos.rows - cursorPos.rows;
return { rows, cols: cursorPos.cols };
}

const clearPreview = () => {
if (inputPreview !== null) {
moveCursor(repl.output, 0, 1);
const { rows } = getPreviewPos();
moveCursor(repl.output, 0, rows);
clearLine(repl.output);
moveCursor(repl.output, 0, -1);
moveCursor(repl.output, 0, -rows);
lastInputPreview = inputPreview;
inputPreview = null;
}
Expand Down Expand Up @@ -280,16 +288,6 @@ function setupPreview(repl, contextSymbol, bufferSymbol, active) {
return;
}

// Do not show previews in case the current line is longer than the column
// width.
// TODO(BridgeAR): Fix me. This should not be necessary. It currently breaks
// the output though. We also have to check for characters that have more
// than a single byte as length. Check Interface.prototype._moveCursor. It
// contains the necessary logic.
if (repl.line.length + repl._prompt.length > repl.columns) {
return;
}

// Add the autocompletion preview.
// TODO(BridgeAR): Trigger the input preview after the completion preview.
// That way it's possible to trigger the input prefix including the
Expand Down Expand Up @@ -344,9 +342,12 @@ function setupPreview(repl, contextSymbol, bufferSymbol, active) {
`\u001b[90m${inspected}\u001b[39m` :
`// ${inspected}`;

const { rows: previewRows, cols: cursorCols } = getPreviewPos();
if (previewRows !== 1)
moveCursor(repl.output, 0, previewRows - 1);
const { cols: resultCols } = repl._getDisplayPos(result);
repl.output.write(`\n${result}`);
moveCursor(repl.output, 0, -1);
cursorTo(repl.output, repl._prompt.length + repl.cursor);
moveCursor(repl.output, cursorCols - resultCols, -previewRows);
});
};

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71 changes: 57 additions & 14 deletions test/parallel/test-repl-history-navigation.js
View file
Expand Up @@ -108,7 +108,7 @@ const tests = [
env: { NODE_REPL_HISTORY: defaultHistoryPath },
skip: !process.features.inspector,
test: [
`const ${'veryLongName'.repeat(30)} = 'I should not be previewed'`,
`const ${'veryLongName'.repeat(30)} = 'I should be previewed'`,
ENTER,
'const e = new RangeError("visible\\ninvisible")',
ENTER,
Expand All @@ -127,27 +127,70 @@ const tests = [
{
env: { NODE_REPL_HISTORY: defaultHistoryPath },
columns: 250,
showEscapeCodes: true,
skip: !process.features.inspector,
test: [
UP,
UP,
UP,
WORD_LEFT,
UP,
BACKSPACE
],
// A = Cursor n up
// B = Cursor n down
// C = Cursor n forward
// D = Cursor n back
// G = Cursor to column n
// J = Erase in screen; 0 = right; 1 = left; 2 = total
// K = Erase in line; 0 = right; 1 = left; 2 = total
expected: [
prompt,
// 0. Start
'\x1B[1G', '\x1B[0J',
prompt, '\x1B[3G',
// 1. UP
// This exceeds the maximum columns (250):
// Whitespace + prompt + ' // '.length + 'function'.length
// 236 + 2 + 4 + 8
`${prompt}${' '.repeat(236)} fun`,
`${prompt}${' '.repeat(235)} fun`,
' // ction',
' // ction',
`${prompt}${'veryLongName'.repeat(30)}`,
`${prompt}e`,
'\n// RangeError: visible',
prompt
'\x1B[1G', '\x1B[0J',
`${prompt}${' '.repeat(236)} fun`, '\x1B[243G',
// 2. UP
'\x1B[1G', '\x1B[0J',
`${prompt}${' '.repeat(235)} fun`, '\x1B[242G',
// TODO(BridgeAR): Investigate why the preview is generated twice.
' // ction', '\x1B[242G',
' // ction', '\x1B[242G',
// Preview cleanup
'\x1B[0K',
// 3. UP
'\x1B[1G', '\x1B[0J',
// 'veryLongName'.repeat(30).length === 360
// prompt.length === 2
// 360 % 250 + 2 === 112 (+1)
`${prompt}${'veryLongName'.repeat(30)}`, '\x1B[113G',
// "// 'I should be previewed'".length + 86 === 112 (+1)
"\n// 'I should be previewed'", '\x1B[86C\x1B[1A',
// Preview cleanup
'\x1B[1B', '\x1B[2K', '\x1B[1A',
// 4. WORD LEFT
// Almost identical as above. Just one extra line.
// Math.floor(360 / 250) === 1
'\x1B[1A',
'\x1B[1G', '\x1B[0J',
`${prompt}${'veryLongName'.repeat(30)}`, '\x1B[3G', '\x1B[1A',
'\x1B[1B', "\n// 'I should be previewed'", '\x1B[24D\x1B[2A',
// Preview cleanup
'\x1B[2B', '\x1B[2K', '\x1B[2A',
// 5. UP
'\x1B[1G', '\x1B[0J',
`${prompt}e`, '\x1B[4G',
// '// RangeError: visible'.length - 19 === 3 (+1)
'\n// RangeError: visible', '\x1B[19D\x1B[1A',
// Preview cleanup
'\x1B[1B', '\x1B[2K', '\x1B[1A',
// 6. Backspace
'\x1B[1G', '\x1B[0J',
prompt, '\x1B[3G'
],
clean: true
},
Expand All @@ -169,11 +212,11 @@ const tests = [
WORD_RIGHT,
ENTER
],
// C = Cursor forward
// D = Cursor back
// C = Cursor n forward
// D = Cursor n back
// G = Cursor to column n
// J = Erase in screen
// K = Erase in line
// J = Erase in screen; 0 = right; 1 = left; 2 = total
// K = Erase in line; 0 = right; 1 = left; 2 = total
expected: [
// 0.
// 'f'
Expand Down
14 changes: 7 additions & 7 deletions test/parallel/test-repl-preview.js
View file
Expand Up @@ -68,12 +68,12 @@ async function tests(options) {
const testCases = [
['foo', [2, 4], '[Function: foo]',
'foo',
'\x1B[90m[Function: foo]\x1B[39m\x1B[1A\x1B[11G\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[90m[Function: foo]\x1B[39m\x1B[5D\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[36m[Function: foo]\x1B[39m',
'\x1B[1G\x1B[0Jrepl > \x1B[8G'],
['koo', [2, 4], '[Function: koo]',
'k\x1B[90moo\x1B[39m\x1B[9G\x1B[0Ko\x1B[90mo\x1B[39m\x1B[10G\x1B[0Ko',
'\x1B[90m[Function: koo]\x1B[39m\x1B[1A\x1B[11G\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[90m[Function: koo]\x1B[39m\x1B[5D\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[36m[Function: koo]\x1B[39m',
'\x1B[1G\x1B[0Jrepl > \x1B[8G'],
['a', [1, 2], undefined],
Expand All @@ -83,19 +83,19 @@ async function tests(options) {
'\x1B[1G\x1B[0Jrepl > \x1B[8G'],
['1n + 2n', [2, 5], '\x1B[33m3n\x1B[39m',
'1n + 2',
'\x1B[90mType[39m\x1B[1A\x1B[14G\x1B[1B\x1B[2K\x1B[1An',
'\x1B[90m3n\x1B[39m\x1B[1A\x1B[15G\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[90mType[39m\x1B[57D\x1B[1A\x1B[1B\x1B[2K\x1B[1An',
'\x1B[90m3n\x1B[39m\x1B[12C\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[33m3n\x1B[39m',
'\x1B[1G\x1B[0Jrepl > \x1B[8G'],
['{ a: true };', [2, 4], '\x1B[33mtrue\x1B[39m',
'{ a: tru\x1B[90me\x1B[39m\x1B[16G\x1B[0Ke };',
'\x1B[90mtrue\x1B[39m\x1B[1A\x1B[20G\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[90mtrue\x1B[39m\x1B[15C\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[33mtrue\x1B[39m',
'\x1B[1G\x1B[0Jrepl > \x1B[8G'],
[' \t { a: true};', [2, 5], '\x1B[33mtrue\x1B[39m',
' \t { a: tru\x1B[90me\x1B[39m\x1B[19G\x1B[0Ke}',
'\x1B[90m{ a: true }\x1B[39m\x1B[1A\x1B[21G\x1B[1B\x1B[2K\x1B[1A;',
'\x1B[90mtrue\x1B[39m\x1B[1A\x1B[22G\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[90m{ a: true }\x1B[39m\x1B[8C\x1B[1A\x1B[1B\x1B[2K\x1B[1A;',
'\x1B[90mtrue\x1B[39m\x1B[16C\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
'\x1B[33mtrue\x1B[39m',
'\x1B[1G\x1B[0Jrepl > \x1B[8G']
];
Expand Down

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