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#!/usr/bin/env node
/**
* @license Apache-2.0
*
* Copyright (c) 2024 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var resolve = require( 'path' ).resolve;
var readFileSync = require( '@stdlib/fs/read-file' ).sync;
var CLI = require( '@stdlib/cli/ctor' );
var stdin = require( '@stdlib/process/read-stdin' );
var stdinStream = require( '@stdlib/streams/node/stdin' );
var RE_EOL = require( '@stdlib/regexp/eol' ).REGEXP;
var isRegExpString = require( '@stdlib/assert/is-regexp-string' );
var reFromString = require( '@stdlib/utils/regexp-from-string' );
var last = require( './../lib' );
// MAIN //
/**
* Main execution sequence.
*
* @private
* @returns {void}
*/
function main() {
var split;
var flags;
var args;
var opts;
var cli;
var n;
// Create a command-line interface:
cli = new CLI({
'pkg': require( './../package.json' ),
'options': require( './../etc/cli_opts.json' ),
'help': readFileSync( resolve( __dirname, '..', 'docs', 'usage.txt' ), {
'encoding': 'utf8'
})
});
// Get any provided command-line options:
flags = cli.flags();
if ( flags.help || flags.version ) {
return;
}
if ( flags.n ) {
n = parseInt( flags.n, 10 );
} else {
n = 1;
}
opts = {};
if ( flags.mode ) {
opts.mode = flags.mode;
}
// Get any provided command-line arguments:
args = cli.args();
// Check if we are receiving data from `stdin`...
if ( !stdinStream.isTTY ) {
if ( flags.split ) {
if ( !isRegExpString( flags.split ) ) {
flags.split = '/'+flags.split+'/';
}
split = reFromString( flags.split );
} else {
split = RE_EOL;
}
return stdin( onRead );
}
try {
console.log( last( args[ 0 ], n, opts ) ); // eslint-disable-line no-console
} catch ( error ) {
return cli.error( error );
}
/**
* Callback invoked upon reading from `stdin`.
*
* @private
* @param {(Error|null)} error - error object
* @param {Buffer} data - data
* @returns {void}
*/
function onRead( error, data ) {
var lines;
var i;
if ( error ) {
return cli.error( error );
}
lines = data.toString().split( split );
// Remove any trailing separators (e.g., trailing newline)...
if ( lines[ lines.length-1 ] === '' ) {
lines.pop();
}
if ( lines.length ) {
try {
console.log( last( lines[ 0 ], n, opts ) ); // eslint-disable-line no-console
} catch ( error ) {
return cli.error( error );
}
for ( i = 1; i < lines.length; i++ ) {
console.log( last( lines[ i ], n, opts ) ); // eslint-disable-line no-console
}
}
}
}
main();