144 lines
3.5 KiB
Plaintext
144 lines
3.5 KiB
Plaintext
/* BARE_OS_BIN_API 1.0.0 — bump when staged /bin script semantics change (see developer guide). */
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/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
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function bareStdin(ctx) {
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return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
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}
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/** @param {number} mode @param {'file' | 'directory' | 'symlink'} type */
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function bareFormatModeString(mode, type) {
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const typeChar =
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type === 'directory' ? 'd' : type === 'symlink' ? 'l' : '-'
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const perm = mode & 0o777
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const r = (bit) => (perm & bit ? 'r' : '-')
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const w = (bit) => (perm & bit ? 'w' : '-')
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const x = (bit) => (perm & bit ? 'x' : '-')
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return (
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typeChar +
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r(0o400) +
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w(0o200) +
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x(0o100) +
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r(0o040) +
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w(0o020) +
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x(0o010) +
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r(0o004) +
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w(0o002) +
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x(0o001)
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)
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}
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/** @param {number} mtimeMs @param {number} [nowMs] */
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function bareFormatLsMtime(mtimeMs, nowMs) {
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const now = nowMs != null ? nowMs : Date.now()
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const d = new Date(mtimeMs)
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const months = [
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'Jan',
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'Feb',
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'Mar',
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'Apr',
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'May',
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'Jun',
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'Jul',
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'Aug',
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'Sep',
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'Oct',
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'Nov',
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'Dec'
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]
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const mon = months[d.getMonth()]
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const day = String(d.getDate()).padStart(2, ' ')
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const sixMo = 180 * 24 * 3600 * 1000
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if (Math.abs(now - mtimeMs) > sixMo) {
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const yr = String(d.getFullYear()).padStart(4, ' ')
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return mon + ' ' + day + ' ' + yr
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}
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const hh = String(d.getHours()).padStart(2, '0')
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const mm = String(d.getMinutes()).padStart(2, '0')
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return mon + ' ' + day + ' ' + hh + ':' + mm
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}
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/** @param {number} size */
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function barePosixBlocks(size) {
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return Math.ceil(Number(size) / 512) || 0
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}
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async function run(ctx, argv) {
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let delim = '\t'
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let fieldsSpec = ''
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const files = []
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for (let i = 1; i < argv.length; i++) {
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const a = argv[i]
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if (a === '-d') {
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delim = argv[++i] || ''
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continue
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}
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if (a === '-f') {
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fieldsSpec = argv[++i] || ''
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continue
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}
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if (a === '--') {
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files.push(...argv.slice(i + 1))
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break
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}
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if (a.startsWith('-')) {
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ctx.console.error('cut: unsupported option ' + a)
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ctx.exitCode = 1
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return
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}
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files.push(a)
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}
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if (!fieldsSpec) {
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ctx.console.error('usage: cut -f LIST [-d DELIM] [FILE...]')
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ctx.exitCode = 1
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return
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}
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function parseFields(s) {
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/** @type {Set<number>} */
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const set = new Set()
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for (const part of s.split(',')) {
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const m = /^(\d+)(?:-(\d+))?$/.exec(part.trim())
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if (!m) continue
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const a = Number(m[1])
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const b = m[2] != null ? Number(m[2]) : a
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for (let j = a; j <= b; j++) set.add(j)
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}
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return set
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}
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const want = parseFields(fieldsSpec)
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if (!want.size) {
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ctx.console.error('cut: invalid field list')
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ctx.exitCode = 1
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return
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}
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async function cutLines(text) {
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const lines = text.split(/\r?\n/)
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for (const line of lines) {
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if (line === '' && lines.length === 1) continue
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const cols =
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delim === ''
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? [...line]
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: line.split(delim === '\\t' ? '\t' : delim)
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const out = []
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for (const n of [...want].sort((a, b) => a - b)) {
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out.push(cols[n - 1] != null ? cols[n - 1] : '')
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}
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ctx.console.log(out.join(delim === '\\t' ? '\t' : delim))
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}
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}
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if (!files.length) {
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await cutLines(bareStdin(ctx))
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return
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}
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for (const f of files) {
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const buf = await ctx.vfs.readFile(f)
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if (!buf) {
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ctx.console.error('cut: ' + f + ': No such file')
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ctx.exitCode = 1
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continue
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}
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await cutLines(ctx.b4a.toString(buf))
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}
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}
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