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* @license Apache-2.0
*
* Copyright (c) 2019 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 statSync = require( 'fs' ).statSync; // TODO: replace with stdlib equivalent
var logger = require( 'debug' );
var parse = require( 'acorn-loose' ).parse;
var isRelativePath = require( '@stdlib/assert/is-relative-path' );
var cwd = require( '@stdlib/process/cwd' );
var readDir = require( '@stdlib/fs/read-dir' ).sync;
var startsWith = require( '@stdlib/string/starts-with' );
var pathRegExp = require( './regexp_path.js' );
var fsAliasArgs = require( './fs_alias_args.js' );
// VARIABLES //
var debug = logger( 'repl:completer:fs' );
var AOPTS = {
'ecmaVersion': 'latest'
};
// MAIN //
/**
* Completes a file system API expression.
*
* @private
* @param {Array} out - output array for storing completions
* @param {string} expression - expression to complete
* @param {string} alias - file system API alias
* @param {string} path - path to complete
* @returns {string} path filter
*/
function complete( out, expression, alias, path ) {
var filter;
var subdir;
var files;
var stats;
var args;
var ast;
var arg;
var dir;
var f;
var i;
// Get the list of argument types for the desired file system API:
debug( 'File system API: %s', alias );
args = fsAliasArgs( alias );
// Parse the expression into an AST:
debug( 'Expression: %s', expression );
ast = parse( expression, AOPTS );
// Check whether the argument which triggered TAB completion has a corresponding argument type which is completable:
debug( 'Checking if argument is completable...' );
arg = args[ ast.body[ 0 ].expression.arguments.length-1 ];
if ( !arg ) {
debug( 'Argument which triggered TAB completion is not completable.' );
return '';
}
debug( 'Argument is completable.' );
// Split the path to complete into two components: subdirectory path and filter...
subdir = path.match( pathRegExp() );
filter = subdir[ 2 ];
subdir = subdir[ 1 ] || '';
debug( 'Searching for completion candidates...' );
if ( isRelativePath( path ) ) {
debug( 'Detected a relative path. Resolving from the current working directory...' );
dir = resolve( cwd(), subdir );
debug( 'Resolved directory: %s', dir );
} else {
dir = subdir;
}
debug( 'Reading directory contents...' );
files = readDir( dir );
if ( files instanceof Error ) {
debug( 'Unable to read directory: %s. Error: %s', dir, files.message );
return '';
}
for ( i = 0; i < files.length; i++ ) {
f = files[ i ];
if ( !startsWith( f, filter ) ) {
debug( '%s does not match filter %s. Skipping...', f, filter );
continue;
}
f = resolve( dir, f );
debug( 'Examining path: %s', f );
try {
stats = statSync( f );
if ( stats.isDirectory() ) {
debug( 'Path resolves to a subdirectory.' );
out.push( files[ i ] + '/' );
debug( 'Found a completion: %s', out[ out.length-1 ] );
} else if ( stats.isFile() ) {
debug( 'Path resolves to a file.' );
out.push( files[ i ] );
debug( 'Found a completion: %s', out[ out.length-1 ] );
} else {
debug( 'Path resolves to neither a directory nor a file. Skipping path...' );
continue;
}
} catch ( err ) {
debug( 'Error: %s', err.message );
debug( 'Skipping path...' );
continue;
}
}
return filter;
}
// EXPORTS //
module.exports = complete;
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