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build.js
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/* eslint-disable no-sync */
'use strict';
// MODULES //
var debug = require( 'debug' )( 'repl:build' );
var writeFile = require( 'fs' ).writeFileSync;
var resolvePath = require( 'path' ).resolve;
var join = require( 'path' ).join;
var resolve = require( 'resolve' ).sync;
var getKeys = require( 'object-keys' ).shim();
var readFile = require( '@stdlib/fs/read-file' ).sync;
var readJSON = require( '@stdlib/fs/read-json' ).sync;
var resolveParentPath = require( '@stdlib/fs/resolve-parent-path' ).sync;
var dirname = require( '@stdlib/utils/dirname' );
var replace = require( '@stdlib/string/replace' );
var hasOwnProp = require( '@stdlib/utils/has-own-property' );
var NAMESPACE = require( './../lib/namespace' );
// VARIABLES //
// Filepath convention for REPL text:
var REPL_TEXT = 'docs/repl.txt';
// Root search directory:
var ROOT = resolvePath( __dirname, '../../' );
// Output file path:
var OUTPUT = resolvePath( __dirname, '../lib/docs.js' );
// Output file preamble:
var PREAMBLE = '// This file is generated by scripts/build.js.\n\'use strict\';\n\n/* eslint-disable quotes */\n\n';
// Identifier for inserting 'See Also' links:
var SEE_ALSO = '\n See Also\n --------\n';
// Regular expression to detect package aliases:
var RE_ALIASES = /(?:{{alias:[^}]+}})+/g;
// Regular expression to capture a package alias:
var RE_ALIAS = /\{\{alias:([^}]+)\}\}/;
// FUNCTIONS //
/**
* Generates a hash mapping paths to aliases.
*
* @private
* @returns {Object} hash mapping paths to aliases
*/
function aliasMap() {
var pkg;
var out;
var i;
out = {};
for ( i = 0; i < NAMESPACE.length; i++ ) {
pkg = NAMESPACE[ i ];
out[ pkg.path ] = pkg.alias;
}
return out;
} // end FUNCTION aliasMap()
/**
* Returns an array of unique items.
*
* @private
* @param {StringArray} arr - input array of strings
* @returns {StringArray} array containing only unique items
*/
function unique( arr ) {
var obj;
var i;
obj = {};
for ( i = 0; i < arr.length; i++ ) {
if ( !hasOwnProp( obj, arr[ i ] ) ) {
obj[ arr[ i ] ] = true;
}
}
return getKeys( obj );
} // end FUNCTION unique()
/**
* Generates hash for REPL help text.
*
* @private
*/
function createHelp() {
var related;
var aliases;
var fpath;
var alias;
var ropts;
var fopts;
var file;
var pkg;
var out;
var len;
var tmp;
var a;
var p;
var i;
var j;
ropts = {
'basedir': ROOT
};
debug( 'Package resolve options: %s', JSON.stringify( ropts ) );
fopts = {
'encoding': 'utf8'
};
aliases = aliasMap();
out = {};
for ( i = 0; i < NAMESPACE.length; i++ ) {
alias = NAMESPACE[ i ].alias;
debug( 'Resolving `%s`', alias );
fpath = resolve( NAMESPACE[ i ].path, ropts );
debug( 'Resolved module path: %s', fpath );
debug( 'Resolving package information.' );
fpath = resolveParentPath( 'package.json', {
'dir': dirname( fpath )
});
if ( fpath === null ) {
debug( 'Unable to resolve package information.' );
continue;
}
debug( 'Reading package information.' );
pkg = readJSON( fpath, fopts );
if ( pkg instanceof Error ) {
debug( 'Unable to read package information: %s', pkg.message );
continue;
}
debug( 'Checking package information.' );
if ( pkg.name !== NAMESPACE[ i ].path ) {
debug( 'Package information does not match path. Expected: %s. Actual: %s.', NAMESPACE[ i ].path, pkg.name );
continue;
}
fpath = join( dirname( fpath ), REPL_TEXT );
debug( 'Attempting to read REPL text: %s', fpath );
file = readFile( fpath, fopts );
if ( file instanceof Error ) {
debug( 'Unable to read REPL text.' );
continue;
}
debug( 'Successfully read REPL text.' );
debug( 'Processing REPL text.' );
file = replace( file, '{{alias}}', alias );
debug( 'Checking for package identifiers.' );
tmp = file.match( RE_ALIASES );
if ( tmp ) {
debug( 'Resolving package identifier aliases.' );
tmp = unique( tmp );
for ( j = 0; j < tmp.length; j++ ) {
p = RE_ALIAS.exec( tmp[ j ] )[ 1 ]; // extracts a package identifier
a = aliases[ p ];
if ( a === void 0 ) {
debug( 'Unable to resolve alias: %s.', p );
console.warn( 'WARNING: unable to resolve alias `%s` for `%s`. ', p, alias );
} else {
file = replace( file, tmp[ j ], a );
debug( 'Resolved alias: %s => %s.', p, a );
}
}
}
debug( 'Resolving related aliases.' );
len = NAMESPACE[ i ].related.length;
if ( len ) {
tmp = [];
related = NAMESPACE[ i ].related;
for ( j = 0; j < len; j++ ) {
a = aliases[ related[ j ] ];
if ( a === void 0 ) {
debug( 'Unable to resolve related alias: %s.', related[ j ] );
console.warn( 'WARNING: unable to resolve related alias `%s` for `%s`. ', related[ j ], alias );
} else {
tmp.push( a );
debug( 'Resolved alias: %s => %s.', related[ j ], a );
}
}
if ( tmp.length ) {
file = replace( file, SEE_ALSO, SEE_ALSO+' '+tmp.join( ', ' ) );
} else {
file = replace( file, SEE_ALSO, '' );
}
} else {
file = replace( file, SEE_ALSO, '' );
}
debug( 'Successfully processed `%s`.', alias );
out[ alias ] = file;
}
debug( 'Writing REPL text hash to file.' );
out = PREAMBLE+'module.exports = '+JSON.stringify( out, null, '\t' )+';\n';
writeFile( OUTPUT, out, fopts );
} // end FUNCTION createHelp()
/**
* Main execution sequence.
*
* @private
*/
function main() {
debug( 'Generating REPL help documentation.' );
createHelp();
} // end FUNCTION main()
// MAIN //
main();