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const utility = require('../utility');
const formatDate = require('dateformat');
const chrono = require('chrono-node');
const NOW_MARKER = '┆';
const ANSI_RESET = '\x1b[0m';
const ANSI_FG_LINE = '\x1b[97m';
const ANSI_FG_NOW = '\x1b[90m';
const ANSI_BG_NOT_STARTED = '\x1b[100m';
const ANSI_BG_STARTED = '\x1b[44m';
const ANSI_BG_COMPLETED = '\x1b[42m';
const DIR_UP = 1;
const DIR_DOWN = 2;
const DIR_LEFT = 4;
const DIR_RIGHT = 8;
const LINE_CHARS = {
[DIR_UP]: '│',
[DIR_DOWN]: '│',
[DIR_LEFT]: '─',
[DIR_RIGHT]: '─',
[DIR_UP | DIR_DOWN]: '│',
[DIR_LEFT | DIR_RIGHT]: '─',
[DIR_DOWN | DIR_RIGHT]: '┌',
[DIR_DOWN | DIR_LEFT]: '┐',
[DIR_UP | DIR_RIGHT]: '└',
[DIR_UP | DIR_LEFT]: '┘',
[DIR_UP | DIR_DOWN | DIR_RIGHT]: '├',
[DIR_UP | DIR_DOWN | DIR_LEFT]: '┤',
[DIR_UP | DIR_LEFT | DIR_RIGHT]: '┴',
[DIR_DOWN | DIR_LEFT | DIR_RIGHT]: '┬',
[DIR_UP | DIR_DOWN | DIR_LEFT | DIR_RIGHT]: '┼'
};
function getBarGeometry(task, from, to, width) {
if (width <= 1 || from.getTime() === to.getTime()) {
return { start: 0, end: 0 };
}
// Calculate the position in the chart
const totalSpan = to.getTime() - from.getTime();
const taskStartPos = Math.max(0, Math.round((task.start.getTime() - from.getTime()) / totalSpan * (width - 1)));
const taskEndPos = Math.min(width - 1, Math.round((task.end.getTime() - from.getTime()) / totalSpan * (width - 1)));
return {
start: taskStartPos,
end: taskEndPos
};
}
function getBarBackground(task) {
if (task.completed instanceof Date) {
return ANSI_BG_COMPLETED;
}
if (task.started instanceof Date) {
return ANSI_BG_STARTED;
}
return ANSI_BG_NOT_STARTED;
}
function createChartCell() {
return {
bg: null,
lineMask: 0,
arrowChar: null,
markerChar: null
};
}
function createChartGrid(height, width) {
return Array.from({ length: height }, () => Array.from({ length: width }, createChartCell));
}
function addMask(cell, mask) {
cell.lineMask |= mask;
}
function addHorizontalConnection(grid, row, fromCol, toCol) {
if (fromCol === toCol) {
return;
}
const step = fromCol < toCol ? 1 : -1;
for (let col = fromCol; col !== toCol; col += step) {
addMask(grid[row][col], step > 0 ? DIR_RIGHT : DIR_LEFT);
addMask(grid[row][col + step], step > 0 ? DIR_LEFT : DIR_RIGHT);
}
}
function addVerticalConnection(grid, col, fromRow, toRow) {
if (fromRow === toRow) {
return;
}
const step = fromRow < toRow ? 1 : -1;
for (let row = fromRow; row !== toRow; row += step) {
addMask(grid[row][col], step > 0 ? DIR_DOWN : DIR_UP);
addMask(grid[row + step][col], step > 0 ? DIR_UP : DIR_DOWN);
}
}
function routeDependency(grid, sourceRow, sourceCol, targetRow, targetCol) {
if (sourceRow === null || targetRow === null) {
return;
}
if (sourceRow === targetRow) {
addHorizontalConnection(grid, sourceRow, sourceCol, targetCol);
grid[targetRow][targetCol].arrowChar = targetCol >= sourceCol ? '→' : '←';
return;
}
const moveRight = targetCol >= sourceCol;
let routeCol = moveRight ? Math.max(sourceCol + 1, targetCol - 1) : Math.min(sourceCol - 1, targetCol + 1);
routeCol = Math.max(0, Math.min(grid[0].length - 1, routeCol));
addHorizontalConnection(grid, sourceRow, sourceCol, routeCol);
addVerticalConnection(grid, routeCol, sourceRow, targetRow);
addHorizontalConnection(grid, targetRow, routeCol, targetCol);
grid[targetRow][targetCol].arrowChar = targetCol >= routeCol ? '→' : '←';
}
function setMarker(cell, markerChar) {
if (!cell.arrowChar && !cell.markerChar) {
cell.markerChar = markerChar;
}
}
function routeIncomingExternalDependency(grid, row, targetCol) {
const arrowCol = Math.max(0, targetCol);
grid[row][arrowCol].arrowChar = '→';
if (arrowCol > 0) {
addMask(grid[row][arrowCol], DIR_LEFT);
addMask(grid[row][arrowCol - 1], DIR_RIGHT);
}
if (arrowCol > 1) {
setMarker(grid[row][arrowCol - 2], '…');
}
}
function routeOutgoingExternalDependency(grid, row, sourceCol, width) {
const arrowCol = Math.min(width - 1, sourceCol);
grid[row][arrowCol].arrowChar = '→';
if (arrowCol < width - 1) {
addMask(grid[row][arrowCol], DIR_RIGHT);
addMask(grid[row][arrowCol + 1], DIR_LEFT);
}
if (arrowCol < width - 2) {
setMarker(grid[row][arrowCol + 2], '…');
}
}
function buildDependencyOverlay(tasks, barGeometries, width) {
const grid = createChartGrid(tasks.length, width);
const taskRowMap = new Map(tasks.map((task, index) => [task.id, index]));
tasks.forEach((task, targetRow) => {
(task.dependencies || []).forEach((dependencyId) => {
const sourceRow = taskRowMap.get(dependencyId);
if (sourceRow === undefined) {
return;
}
routeDependency(
grid,
sourceRow,
barGeometries[sourceRow].end,
targetRow,
barGeometries[targetRow].start
);
});
if (Array.isArray(task.externalIncomingDependencies) && task.externalIncomingDependencies.length > 0) {
routeIncomingExternalDependency(grid, targetRow, barGeometries[targetRow].start);
}
if (Array.isArray(task.externalOutgoingDependents) && task.externalOutgoingDependents.length > 0) {
routeOutgoingExternalDependency(grid, targetRow, barGeometries[targetRow].end, width);
}
});
return grid;
}
function styleCell(char, fg = null, bg = null) {
if (!fg && !bg) {
return char;
}
return `${fg || ''}${bg || ''}${char}${ANSI_RESET}`;
}
function renderChartRow(gridRow, barGeometry, barBackground, nowPosition) {
return gridRow.map((cell, column) => {
const bg = column >= barGeometry.start && column <= barGeometry.end ? barBackground : null;
if (cell.arrowChar) {
return styleCell(cell.arrowChar, ANSI_FG_LINE, bg);
}
const lineChar = LINE_CHARS[cell.lineMask] || null;
if (lineChar) {
return styleCell(lineChar, ANSI_FG_LINE, bg);
}
if (cell.markerChar) {
return styleCell(cell.markerChar, ANSI_FG_LINE, bg);
}
if (nowPosition === column) {
return styleCell(NOW_MARKER, ANSI_FG_NOW, bg);
}
return styleCell(' ', null, bg);
}).join('');
}
function renderTickRow(ticks, nowPosition) {
return ticks.split('').map((char, column) => {
if (char !== ' ') {
return styleCell(char, ANSI_FG_LINE, null);
}
if (nowPosition === column) {
return styleCell(NOW_MARKER, ANSI_FG_NOW, null);
}
return char;
}).join('');
}
function getLabelPlacements(from, to, width, dateFormat, maxLabels) {
for (let count = maxLabels; count >= 1; count--) {
const placements = [];
let previousEnd = -1;
for (let i = 0; i < count; i++) {
const ratio = count === 1 ? 0 : i / (count - 1);
const position = Math.round(ratio * (width - 1));
const value = new Date(from.getTime() + Math.round((to.getTime() - from.getTime()) * ratio));
const label = formatDate(value, dateFormat);
let start = position - Math.floor(label.length / 2);
if (start < 0) {
start = 0;
}
if (start + label.length > width) {
start = Math.max(0, width - label.length);
}
const end = start + label.length - 1;
if (i > 0 && start <= previousEnd + 1) {
placements.length = 0;
break;
}
placements.push({ position, start, label, end });
previousEnd = end;
}
if (placements.length) {
return placements;
}
}
return [];
}
function renderXAxisLabels(from, to, width, dateFormat) {
const sampleLabel = formatDate(from, dateFormat);
const maxLabels = Math.max(1, Math.floor((width + 2) / (sampleLabel.length + 2)));
const placements = getLabelPlacements(from, to, width, dateFormat, maxLabels);
const ticks = Array(width).fill(' ');
const labels = Array(width).fill(' ');
for (const placement of placements) {
ticks[placement.position] = '│';
for (let i = 0; i < placement.label.length; i++) {
labels[placement.start + i] = placement.label[i];
}
}
return [ticks.join(''), labels.join('')];
}
function getNowPosition(from, to, width, now = new Date()) {
if (now < from || now > to) {
return null;
}
const totalSpan = to.getTime() - from.getTime();
return Math.round((now.getTime() - from.getTime()) / totalSpan * (width - 1));
}
function renderNowOverlay(line, nowPosition) {
if (nowPosition === null || nowPosition < 0 || nowPosition >= line.length) {
return line;
}
const result = line.split('');
result[nowPosition] = NOW_MARKER;
return result.join('');
}
function truncateName(name, maxWidth) {
if (name.length <= maxWidth) {
return name;
}
return name.substring(0, maxWidth - 1) + '…';
}
module.exports = async args => {
// Make sure kanbn has been initialised
if (!await kanbn.initialised()) {
utility.error('Kanbn has not been initialised in this folder\nTry running: {b}kanbn init{b}');
return;
}
const index = await kanbn.getIndex();
// Get assigned
let assigned = null;
if (args.assigned) {
assigned = utility.strArg(args.assigned);
}
// Get columns
let columns = null;
if (args.column) {
columns = utility.arrayArg(args.column);
}
// Get dates
let dates = null;
if (args.date) {
dates = utility.arrayArg(args.date);
if (dates.length) {
for (let i = 0; i < dates.length; i++) {
const dateValue = chrono.parseDate(dates[i]);
if (dateValue === null) {
utility.error('Unable to parse date');
return;
}
dates[i] = dateValue;
}
}
}
// Get mocked now date
let now = null;
if (args.now) {
now = chrono.parseDate(utility.strArg(args.now));
if (now === null) {
utility.error('Unable to parse now date');
return;
}
}
// Show gantt chart data
kanbn
.gantt(assigned, columns, dates, now)
.then(data => {
if (args.json) {
// Output raw data
console.log(JSON.stringify(data, null, 2));
} else {
// Render chart
const dateFormat = kanbn.getDateFormat(index);
const maxNameWidth = 16;
const nowDate = now || new Date();
// Keep each rendered task line within terminal width where possible.
// Line shape: "<prefix> <name> │<bar>│" => maxNameWidth + barWidth + 5 columns.
const terminalWidth = Number.isFinite(process.stdout.columns) && process.stdout.columns > 0
? process.stdout.columns
: 120;
const barWidth = Math.max(1, terminalWidth - maxNameWidth - 5);
const nowPosition = getNowPosition(data.from, data.to, barWidth, nowDate);
const barGeometries = data.tasks.map((task) => getBarGeometry(task, data.from, data.to, barWidth));
const dependencyOverlay = buildDependencyOverlay(data.tasks, barGeometries, barWidth);
// Render header
console.log(`Gantt chart: ${formatDate(data.from, dateFormat)} to ${formatDate(data.to, dateFormat)}`);
if (data.dependencyCycleDetected) {
const cycleDescription = Array.isArray(data.dependencyCycleTaskIds) && data.dependencyCycleTaskIds.length
? ` Cycle: ${data.dependencyCycleTaskIds.join(' -> ')}.`
: '';
console.error(`Warning: dependency cycle detected; using fallback ordering for ${data.cycleFallbackTaskIds.length} task(s).${cycleDescription}`);
}
console.log('');
// Render tasks with bars
data.tasks.forEach((task, taskIndex) => {
const prefix = task.blocked ? '⧗' : ' ';
const truncatedName = truncateName(task.name, maxNameWidth);
const bar = renderChartRow(
dependencyOverlay[taskIndex],
barGeometries[taskIndex],
getBarBackground(task),
nowPosition
);
console.log(`${prefix} ${truncatedName.padEnd(maxNameWidth)} │${bar}│`);
});
// Render x-axis
const [ticks, labels] = renderXAxisLabels(data.from, data.to, barWidth, dateFormat);
console.log(` ${''.padEnd(maxNameWidth)} ${renderTickRow(ticks, nowPosition)}`);
console.log(` ${''.padEnd(maxNameWidth)} ${labels}`);
}
})
.catch(error => {
utility.error(error);
});
};
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