js-codepage/bin/codepage.njs

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#!/usr/bin/env node
/* js-codepage (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2 ft=javascript: */
var codepage = require('../');
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require('exit-on-epipe');
var fs = require('fs'), program/*:any*/ = (require('commander')/*:any*/);
program
.version(codepage.version)
.usage('[options] <file>')
.option('-f, --from-code <code>', 'codepage of input (default 65001 utf8)')
.option('-t, --to-code <code>', 'codepage of output (default 65001 utf8)')
.option('-o, --output <file>', 'output file (<file>.<to> if specified)')
.option('-B, --bom', 'write BOM (for unicode codepages)')
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.option('-F, --force', 'force writing to stdout for non-utf8 codepages')
.option('-l, --list', 'List supported codepages');
program.on('--help', function() {
console.log(' Codepage descriptions can be found in the README');
console.log(' http://oss.sheetjs.com/js-codepage/README.md');
console.log(' Support email: dev.codepage@sheetjs.com');
});
program.parse(process.argv);
if(program.list) {
var l/*:Array<number>*/ = [];
Object.keys(codepage).forEach(function(x) { if(parseInt(x) == +x) l.push(+x); });
Object.keys(codepage.utils.magic).forEach(function(x) { if(parseInt(x) == +x && +x != 16969) l.push(+x); });
l.sort(function(a,b) { return a-b; }).forEach(function(x) { console.log(x); });
process.exit();
}
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var fr = +program.fromCode || 65001;
var to = +program.toCode || 65001;
var f = program.args[0];
var o = program.output;
if(!process.stdin.isTTY) f = f || "-";
if(f !== "-" && !fs.existsSync(f)) {
console.error('codepage: must specify a filename');
process.exit(13);
}
function concat(func) {
var writable = require('stream').Writable();
var buf = [];
writable._write = function(chunk, e, cb) { console.error(chunk.length); buf.push(chunk); cb(); };
writable._writev = function(chunks, cb) { console.error(chunks.length, chunks.map(x => x.length)); chunks.forEach(function(c) { buf.push(c); cb(); }); };
writable.on('finish', function() { console.error(buf.length, "end"); func(Buffer.concat(buf)); });
return writable;
}
if(f === "-") process.stdin.pipe(concat(process_text));
else process_text(fs.readFileSync(f));
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function process_text(text/*:Buffer*/) {
var dec/*:Buffer*/ = codepage.utils.decode(fr, text);
var bom/*:Array<Buffer>*/ = [];
bom[1200] = new Buffer([0xFF, 0xFE]);
bom[1201] = new Buffer([0xFE, 0xFF]);
bom[12000] = new Buffer([0xFF, 0xFE, 0x00, 0x00]);
bom[12001] = new Buffer([0x00, 0x00, 0xFE, 0xFF]);
bom[16969] = new Buffer([0x69, 0x69]);
bom[65000] = new Buffer([0x2B, 0x2F, 0x76, 0x2B]);
bom[65001] = new Buffer([0xEF, 0xBB, 0xBF]);
var mybom = (program.bom && bom[to] ? bom[to] : "");
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var out/*:any*/ = to === 65001 ? dec.toString('utf8') : codepage.utils.encode(to, dec);
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/* if output file is specified */
if(o) writefile(o, out, mybom);
/* utf8 -> print to stdout */
else if(to === 65001) logit(out, mybom);
/* stdout piped to process -> print */
else if(!process.stdout.isTTY) logit(out, mybom);
/* forced */
else if(program.force) logit(out, mybom);
/* input file specified -> write to file */
else if(f !== "-") writefile(f + "." + to, out, mybom);
else {
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console.error('codepage: use force (-F, --force) to print ' + to + ' codes');
process.exit(14);
}
}
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function logit(out/*:Buffer*/, bom) {
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process.stdout.write(bom);
process.stdout.write(out);
}
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function writefile(o, out/*:Buffer*/, bom) {
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fs.writeFileSync(o, bom);
fs.appendFileSync(o, out);
}