511 lines
13 KiB
Plaintext
511 lines
13 KiB
Plaintext
/** 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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/**
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* Subset of POSIX/GNU grep behavior using JavaScript RegExp / string search.
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* Not bit-identical to GNU grep (no PCRE, different escaping, UTF-16 strings).
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*/
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async function run(ctx, argv) {
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const vfs = ctx.vfs
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const patterns = []
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const patternFiles = []
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let fixed = false
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let icase = false
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let invert = false
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let numbers = false
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let countOnly = false
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let listFiles = false
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let quiet = false
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let suppressErrors = false
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let forceFilename = false
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let noFilename = false
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let word = false
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let fullLine = false
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let onlyMatching = false
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/** @type {number} */
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let maxMatchLines = Number.POSITIVE_INFINITY
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const args = argv.slice(1)
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let i = 0
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function usage() {
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ctx.console.error(
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'usage: grep [-E|-F] [-i] [-v] [-w] [-x] [-n] [-c] [-l] [-o] [-m NUM] [-q] [-s] [-H|-h] [-e pat] ... [-f file] ... [pattern] [file...]'
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)
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ctx.exitCode = 2
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}
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while (i < args.length) {
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const a = args[i]
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if (a === '--') {
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i++
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break
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}
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if (a === '-' || !a.startsWith('-')) break
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if (a.startsWith('--')) {
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ctx.console.error('grep: unknown option ' + a)
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ctx.exitCode = 2
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return
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}
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if (a === '-m') {
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if (i + 1 >= args.length) {
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usage()
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return
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}
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const n = Number.parseInt(args[++i], 10)
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if (!Number.isFinite(n) || n < 0) {
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ctx.console.error('grep: invalid -m value')
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ctx.exitCode = 2
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return
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}
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maxMatchLines = n === 0 ? Number.POSITIVE_INFINITY : n
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i++
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continue
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}
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if (/^-m\d+$/.test(a)) {
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const n = Number.parseInt(a.slice(2), 10)
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if (!Number.isFinite(n) || n < 0) {
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ctx.console.error('grep: invalid -m value')
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ctx.exitCode = 2
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return
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}
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maxMatchLines = n === 0 ? Number.POSITIVE_INFINITY : n
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i++
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continue
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}
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if (a === '-e') {
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if (i + 1 >= args.length) {
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usage()
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return
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}
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patterns.push(args[++i])
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i++
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continue
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}
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if (a.startsWith('-e') && a.length > 2) {
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patterns.push(a.slice(2))
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i++
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continue
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}
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if (a === '-f') {
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if (i + 1 >= args.length) {
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usage()
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return
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}
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patternFiles.push(args[++i])
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i++
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continue
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}
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if (a.startsWith('-f') && a.length > 2) {
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patternFiles.push(a.slice(2))
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i++
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continue
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}
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const rest = a.slice(1)
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for (let j = 0; j < rest.length; j++) {
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const c = rest[j]
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switch (c) {
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case 'E':
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/* Accepted for GNU compatibility; patterns use JS RegExp (ERE-like). */
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break
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case 'F':
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fixed = true
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break
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case 'i':
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icase = true
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break
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case 'v':
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invert = true
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break
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case 'n':
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numbers = true
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break
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case 'c':
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countOnly = true
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break
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case 'l':
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listFiles = true
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break
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case 'q':
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quiet = true
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break
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case 's':
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suppressErrors = true
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break
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case 'H':
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forceFilename = true
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break
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case 'h':
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noFilename = true
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break
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case 'w':
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word = true
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break
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case 'x':
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fullLine = true
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break
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case 'o':
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onlyMatching = true
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break
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case 'm': {
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let num = ''
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let jj = j + 1
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while (jj < rest.length && /[0-9]/.test(rest[jj])) num += rest[jj++]
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if (!num) {
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ctx.console.error('grep: option requires an argument -- m')
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ctx.exitCode = 2
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return
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}
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const n = Number.parseInt(num, 10)
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maxMatchLines = n === 0 ? Number.POSITIVE_INFINITY : n
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j = jj - 1
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break
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}
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default:
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ctx.console.error('grep: invalid option -- ' + c)
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ctx.exitCode = 2
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return
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}
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}
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i++
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}
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for (const pf of patternFiles) {
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try {
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const buf = await vfs.readFile(pf)
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if (!buf) {
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if (!suppressErrors) ctx.console.error('grep: ' + pf + ': No such file')
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ctx.exitCode = 2
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return
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}
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const t = ctx.b4a.toString(buf)
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for (const line of t.split(/\r?\n/)) {
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const s = line.trimEnd()
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if (s === '' || s.startsWith('#')) continue
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patterns.push(s)
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}
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} catch (e) {
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if (!suppressErrors)
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ctx.console.error('grep: ' + pf + ': ' + (e.message || e))
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ctx.exitCode = 2
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return
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}
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}
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const rest = args.slice(i)
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if (patterns.length === 0) {
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if (rest.length === 0) {
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usage()
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return
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}
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patterns.push(rest.shift())
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}
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const fileArgs = rest
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const useStdin = fileArgs.length === 0
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const inputs = useStdin
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? [{ label: null, path: null }]
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: fileArgs.map((p) => ({ label: p, path: p }))
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let matchers
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try {
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matchers = buildMatchers(patterns, { fixed, icase, word, fullLine })
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} catch (e) {
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ctx.console.error('grep: ' + (e.message || e))
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ctx.exitCode = 2
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return
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}
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const multiFile = inputs.length > 1
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const showName =
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!noFilename && (multiFile || forceFilename || (useStdin && forceFilename))
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let anyMatch = false
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let fatal = false
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let matchingLinesTotal = 0
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for (const { label, path } of inputs) {
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let text
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if (path == null) {
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text = bareStdin(ctx)
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} else {
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try {
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const buf = await vfs.readFile(path)
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if (!buf) {
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if (!suppressErrors)
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ctx.console.error('grep: ' + path + ': No such file')
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fatal = true
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continue
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}
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text = ctx.b4a.toString(buf)
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} catch (e) {
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if (!suppressErrors)
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ctx.console.error('grep: ' + path + ': ' + (e.message || e))
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fatal = true
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continue
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}
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}
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const lines = splitLines(text)
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let count = 0
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let fileMatched = false
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const out = []
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for (let li = 0; li < lines.length; li++) {
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if (matchingLinesTotal >= maxMatchLines) break
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const line = stripCr(lines[li])
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const lineNum = li + 1
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const matched = matchers.some((fn) => fn(line))
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const hit = invert ? !matched : matched
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if (!hit) continue
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matchingLinesTotal++
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fileMatched = true
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anyMatch = true
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count++
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if (quiet) continue
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if (!countOnly && !listFiles) {
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if (onlyMatching && !invert) {
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const parts = extractOnlyMatching(line, patterns, { fixed, icase, word })
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for (const part of parts) {
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let chunk = part
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if (numbers) chunk = lineNum + ':' + chunk
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if (showName && label != null) chunk = label + ':' + chunk
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else if (showName && label == null && useStdin)
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chunk = '(standard input):' + chunk
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out.push(chunk)
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}
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} else {
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let chunk = line
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if (numbers) chunk = lineNum + ':' + chunk
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if (showName && label != null) chunk = label + ':' + chunk
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else if (showName && label == null && useStdin)
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chunk = '(standard input):' + chunk
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out.push(chunk)
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}
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}
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}
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if (quiet) continue
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if (listFiles && countOnly) {
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if (fileMatched) {
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const prefix = namePrefixForCount(showName, label, useStdin, multiFile)
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ctx.console.log(prefix + count)
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}
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} else if (listFiles) {
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if (fileMatched) {
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if (label != null) ctx.console.log(label)
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else if (useStdin) ctx.console.log('(standard input)')
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}
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} else if (countOnly) {
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const prefix = namePrefixForCount(showName, label, useStdin, multiFile)
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ctx.console.log(prefix + count)
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} else {
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for (const o of out) ctx.console.log(o)
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}
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}
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if (fatal) ctx.exitCode = 2
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else ctx.exitCode = anyMatch ? 0 : 1
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}
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/**
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* @param {string[]} patterns
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* @param {{ fixed: boolean, icase: boolean, word?: boolean, fullLine?: boolean }} o
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*/
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function buildMatchers(patterns, o) {
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if (patterns.length === 0) throw new Error('no pattern')
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if (o.fixed) {
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const pats = o.icase
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? patterns.map((p) => p.toLowerCase())
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: patterns.slice()
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return pats.map((p, idx) => {
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const orig = patterns[idx]
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if (o.fullLine) {
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return (line) => {
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const cmpL = o.icase ? line.toLowerCase() : line
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const cmpP = o.icase ? p : orig
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return cmpL === cmpP
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}
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}
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if (o.word) {
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const esc = p.replace(/[\\^$*+?.()|[\]{}]/g, '\\$&')
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const flags = o.icase ? 'i' : ''
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const re = new RegExp(
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'(?:^|[^0-9A-Za-z_])' + esc + '(?:$|[^0-9A-Za-z_])',
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flags
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)
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return (line) => re.test(line)
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}
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return (line) =>
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o.icase ? line.toLowerCase().includes(p) : line.includes(orig)
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})
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}
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const flags = o.icase ? 'i' : ''
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return patterns.map((p) => {
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try {
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const body = o.word ? '\\b(?:' + p + ')\\b' : p
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const wrapped = o.fullLine ? '^(?:' + body + ')$' : body
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const re = new RegExp(wrapped, flags)
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return (line) => re.test(line)
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} catch (e) {
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throw new Error('invalid regex: ' + (e.message || e))
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}
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})
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}
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/**
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* @param {string} line
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* @param {string[]} patterns
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* @param {{ fixed: boolean, icase: boolean, word: boolean }} o
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*/
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function extractOnlyMatching(line, patterns, o) {
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/** @type {{ start: number, end: number, text: string }[]} */
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const raw = []
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if (o.fixed) {
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for (const pat of patterns) {
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const needle = o.icase ? pat.toLowerCase() : pat
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const hay = o.icase ? line.toLowerCase() : line
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let pos = 0
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while (pos <= hay.length) {
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const idx = hay.indexOf(needle, pos)
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if (idx === -1) break
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const end = idx + needle.length
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if (o.word) {
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const before = idx > 0 ? hay[idx - 1] : ' '
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const after = end < hay.length ? hay[end] : ' '
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if (/[0-9A-Za-z_]/.test(before) || /[0-9A-Za-z_]/.test(after)) {
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pos = idx + 1
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continue
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}
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}
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raw.push({ start: idx, end, text: line.slice(idx, end) })
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pos = idx + 1
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}
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}
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} else {
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const flags = o.icase ? 'i' : ''
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for (const p of patterns) {
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const body = o.word ? '\\b(?:' + p + ')\\b' : p
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let re
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try {
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re = new RegExp(body, flags + 'g')
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} catch (e) {
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throw new Error('invalid regex: ' + (e.message || e))
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}
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let m
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while ((m = re.exec(line)) !== null) {
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raw.push({
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start: m.index,
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end: m.index + m[0].length,
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text: m[0]
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})
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if (m[0] === '') {
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re.lastIndex++
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if (re.lastIndex > line.length) break
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}
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}
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}
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}
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raw.sort((a, b) => a.start - b.start || b.end - a.end)
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/** @type {string[]} */
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const out = []
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let lastEnd = -1
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for (const c of raw) {
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if (c.start >= lastEnd) {
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out.push(c.text)
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lastEnd = c.end
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}
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}
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return out
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}
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/** @param {string} text */
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function splitLines(text) {
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if (text === '') return ['']
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return text.split(/\n/)
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}
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/** @param {string} line */
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function stripCr(line) {
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return line.endsWith('\r') ? line.slice(0, -1) : line
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}
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/**
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* @param {boolean} showName
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* @param {string | null} label
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* @param {boolean} useStdin
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* @param {boolean} multiFile
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*/
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function namePrefixForCount(showName, label, useStdin, multiFile) {
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const need = multiFile || (showName && (label != null || useStdin))
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if (!need) return ''
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if (label != null) return label + ':'
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return '(standard input):'
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}
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