Mini Shell
/**
* dashdash - A light, featureful and explicit option parsing library for
* node.js.
*/
// vim: set ts=4 sts=4 sw=4 et:
var assert = require('assert-plus');
var format = require('util').format;
var fs = require('fs');
var path = require('path');
var DEBUG = true;
if (DEBUG) {
var debug = console.warn;
} else {
var debug = function () {};
}
// ---- internal support stuff
// Replace {{variable}} in `s` with the template data in `d`.
function renderTemplate(s, d) {
return s.replace(/{{([a-zA-Z]+)}}/g, function (match, key) {
return d.hasOwnProperty(key) ? d[key] : match;
});
}
/**
* Return a shallow copy of the given object;
*/
function shallowCopy(obj) {
if (!obj) {
return (obj);
}
var copy = {};
Object.keys(obj).forEach(function (k) {
copy[k] = obj[k];
});
return (copy);
}
function space(n) {
var s = '';
for (var i = 0; i < n; i++) {
s += ' ';
}
return s;
}
function makeIndent(arg, deflen, name) {
if (arg === null || arg === undefined)
return space(deflen);
else if (typeof (arg) === 'number')
return space(arg);
else if (typeof (arg) === 'string')
return arg;
else
assert.fail('invalid "' + name + '": not a string or number: ' + arg);
}
/**
* Return an array of lines wrapping the given text to the given width.
* This splits on whitespace. Single tokens longer than `width` are not
* broken up.
*/
function textwrap(s, width) {
var words = s.trim().split(/\s+/);
var lines = [];
var line = '';
words.forEach(function (w) {
var newLength = line.length + w.length;
if (line.length > 0)
newLength += 1;
if (newLength > width) {
lines.push(line);
line = '';
}
if (line.length > 0)
line += ' ';
line += w;
});
lines.push(line);
return lines;
}
/**
* Transform an option name to a "key" that is used as the field
* on the `opts` object returned from `<parser>.parse()`.
*
* Transformations:
* - '-' -> '_': This allow one to use hyphen in option names (common)
* but not have to do silly things like `opt["dry-run"]` to access the
* parsed results.
*/
function optionKeyFromName(name) {
return name.replace(/-/g, '_');
}
// ---- Option types
function parseBool(option, optstr, arg) {
return Boolean(arg);
}
function parseString(option, optstr, arg) {
assert.string(arg, 'arg');
return arg;
}
function parseNumber(option, optstr, arg) {
assert.string(arg, 'arg');
var num = Number(arg);
if (isNaN(num)) {
throw new Error(format('arg for "%s" is not a number: "%s"',
optstr, arg));
}
return num;
}
function parseInteger(option, optstr, arg) {
assert.string(arg, 'arg');
var num = Number(arg);
if (!/^[0-9-]+$/.test(arg) || isNaN(num)) {
throw new Error(format('arg for "%s" is not an integer: "%s"',
optstr, arg));
}
return num;
}
function parsePositiveInteger(option, optstr, arg) {
assert.string(arg, 'arg');
var num = Number(arg);
if (!/^[0-9]+$/.test(arg) || isNaN(num) || num === 0) {
throw new Error(format('arg for "%s" is not a positive integer: "%s"',
optstr, arg));
}
return num;
}
/**
* Supported date args:
* - epoch second times (e.g. 1396031701)
* - ISO 8601 format: YYYY-MM-DD[THH:MM:SS[.sss][Z]]
* 2014-03-28T18:35:01.489Z
* 2014-03-28T18:35:01.489
* 2014-03-28T18:35:01Z
* 2014-03-28T18:35:01
* 2014-03-28
*/
function parseDate(option, optstr, arg) {
assert.string(arg, 'arg');
var date;
if (/^\d+$/.test(arg)) {
// epoch seconds
date = new Date(Number(arg) * 1000);
/* JSSTYLED */
} else if (/^\d{4}-\d{2}-\d{2}(T\d{2}:\d{2}:\d{2}(\.\d+)?Z?)?$/i.test(arg)) {
// ISO 8601 format
date = new Date(arg);
} else {
throw new Error(format('arg for "%s" is not a valid date format: "%s"',
optstr, arg));
}
if (date.toString() === 'Invalid Date') {
throw new Error(format('arg for "%s" is an invalid date: "%s"',
optstr, arg));
}
return date;
}
var optionTypes = {
bool: {
takesArg: false,
parseArg: parseBool
},
string: {
takesArg: true,
helpArg: 'ARG',
parseArg: parseString
},
number: {
takesArg: true,
helpArg: 'NUM',
parseArg: parseNumber
},
integer: {
takesArg: true,
helpArg: 'INT',
parseArg: parseInteger
},
positiveInteger: {
takesArg: true,
helpArg: 'INT',
parseArg: parsePositiveInteger
},
date: {
takesArg: true,
helpArg: 'DATE',
parseArg: parseDate
},
arrayOfBool: {
takesArg: false,
array: true,
parseArg: parseBool
},
arrayOfString: {
takesArg: true,
helpArg: 'ARG',
array: true,
parseArg: parseString
},
arrayOfNumber: {
takesArg: true,
helpArg: 'NUM',
array: true,
parseArg: parseNumber
},
arrayOfInteger: {
takesArg: true,
helpArg: 'INT',
array: true,
parseArg: parseInteger
},
arrayOfPositiveInteger: {
takesArg: true,
helpArg: 'INT',
array: true,
parseArg: parsePositiveInteger
},
arrayOfDate: {
takesArg: true,
helpArg: 'INT',
array: true,
parseArg: parseDate
},
};
// ---- Parser
/**
* Parser constructor.
*
* @param config {Object} The parser configuration
* - options {Array} Array of option specs. See the README for how to
* specify each option spec.
* - allowUnknown {Boolean} Default false. Whether to throw on unknown
* options. If false, then unknown args are included in the _args array.
* - interspersed {Boolean} Default true. Whether to allow interspersed
* arguments (non-options) and options. E.g.:
* node tool.js arg1 arg2 -v
* '-v' is after some args here. If `interspersed: false` then '-v'
* would not be parsed out. Note that regardless of `interspersed`
* the presence of '--' will stop option parsing, as all good
* option parsers should.
*/
function Parser(config) {
assert.object(config, 'config');
assert.arrayOfObject(config.options, 'config.options');
assert.optionalBool(config.interspersed, 'config.interspersed');
var self = this;
// Allow interspersed arguments (true by default).
this.interspersed = (config.interspersed !== undefined
? config.interspersed : true);
// Don't allow unknown flags (true by default).
this.allowUnknown = (config.allowUnknown !== undefined
? config.allowUnknown : false);
this.options = config.options.map(function (o) { return shallowCopy(o); });
this.optionFromName = {};
this.optionFromEnv = {};
for (var i = 0; i < this.options.length; i++) {
var o = this.options[i];
if (o.group !== undefined && o.group !== null) {
assert.optionalString(o.group,
format('config.options.%d.group', i));
continue;
}
assert.ok(optionTypes[o.type],
format('invalid config.options.%d.type: "%s" in %j',
i, o.type, o));
assert.optionalString(o.name, format('config.options.%d.name', i));
assert.optionalArrayOfString(o.names,
format('config.options.%d.names', i));
assert.ok((o.name || o.names) && !(o.name && o.names),
format('exactly one of "name" or "names" required: %j', o));
assert.optionalString(o.help, format('config.options.%d.help', i));
var env = o.env || [];
if (typeof (env) === 'string') {
env = [env];
}
assert.optionalArrayOfString(env, format('config.options.%d.env', i));
assert.optionalString(o.helpGroup,
format('config.options.%d.helpGroup', i));
assert.optionalBool(o.helpWrap,
format('config.options.%d.helpWrap', i));
assert.optionalBool(o.hidden, format('config.options.%d.hidden', i));
if (o.name) {
o.names = [o.name];
} else {
assert.string(o.names[0],
format('config.options.%d.names is empty', i));
}
o.key = optionKeyFromName(o.names[0]);
o.names.forEach(function (n) {
if (self.optionFromName[n]) {
throw new Error(format(
'option name collision: "%s" used in %j and %j',
n, self.optionFromName[n], o));
}
self.optionFromName[n] = o;
});
env.forEach(function (n) {
if (self.optionFromEnv[n]) {
throw new Error(format(
'option env collision: "%s" used in %j and %j',
n, self.optionFromEnv[n], o));
}
self.optionFromEnv[n] = o;
});
}
}
Parser.prototype.optionTakesArg = function optionTakesArg(option) {
return optionTypes[option.type].takesArg;
};
/**
* Parse options from the given argv.
*
* @param inputs {Object} Optional.
* - argv {Array} Optional. The argv to parse. Defaults to
* `process.argv`.
* - slice {Number} The index into argv at which options/args begin.
* Default is 2, as appropriate for `process.argv`.
* - env {Object} Optional. The env to use for 'env' entries in the
* option specs. Defaults to `process.env`.
* @returns {Object} Parsed `opts`. It has special keys `_args` (the
* remaining args from `argv`) and `_order` (gives the order that
* options were specified).
*/
Parser.prototype.parse = function parse(inputs) {
var self = this;
// Old API was `parse([argv, [slice]])`
if (Array.isArray(arguments[0])) {
inputs = {argv: arguments[0], slice: arguments[1]};
}
assert.optionalObject(inputs, 'inputs');
if (!inputs) {
inputs = {};
}
assert.optionalArrayOfString(inputs.argv, 'inputs.argv');
//assert.optionalNumber(slice, 'slice');
var argv = inputs.argv || process.argv;
var slice = inputs.slice !== undefined ? inputs.slice : 2;
var args = argv.slice(slice);
var env = inputs.env || process.env;
var opts = {};
var _order = [];
function addOpt(option, optstr, key, val, from) {
var type = optionTypes[option.type];
var parsedVal = type.parseArg(option, optstr, val);
if (type.array) {
if (!opts[key]) {
opts[key] = [];
}
if (type.arrayFlatten && Array.isArray(parsedVal)) {
for (var i = 0; i < parsedVal.length; i++) {
opts[key].push(parsedVal[i]);
}
} else {
opts[key].push(parsedVal);
}
} else {
opts[key] = parsedVal;
}
var item = { key: key, value: parsedVal, from: from };
_order.push(item);
}
// Parse args.
var _args = [];
var i = 0;
outer: while (i < args.length) {
var arg = args[i];
// End of options marker.
if (arg === '--') {
i++;
break;
// Long option
} else if (arg.slice(0, 2) === '--') {
var name = arg.slice(2);
var val = null;
var idx = name.indexOf('=');
if (idx !== -1) {
val = name.slice(idx + 1);
name = name.slice(0, idx);
}
var option = this.optionFromName[name];
if (!option) {
if (!this.allowUnknown)
throw new Error(format('unknown option: "--%s"', name));
else if (this.interspersed)
_args.push(arg);
else
break outer;
} else {
var takesArg = this.optionTakesArg(option);
if (val !== null && !takesArg) {
throw new Error(format('argument given to "--%s" option '
+ 'that does not take one: "%s"', name, arg));
}
if (!takesArg) {
addOpt(option, '--'+name, option.key, true, 'argv');
} else if (val !== null) {
addOpt(option, '--'+name, option.key, val, 'argv');
} else if (i + 1 >= args.length) {
throw new Error(format('do not have enough args for "--%s" '
+ 'option', name));
} else {
addOpt(option, '--'+name, option.key, args[i + 1], 'argv');
i++;
}
}
// Short option
} else if (arg[0] === '-' && arg.length > 1) {
var j = 1;
var allFound = true;
while (j < arg.length) {
var name = arg[j];
var option = this.optionFromName[name];
if (!option) {
allFound = false;
if (this.allowUnknown) {
if (this.interspersed) {
_args.push(arg);
break;
} else
break outer;
} else if (arg.length > 2) {
throw new Error(format(
'unknown option: "-%s" in "%s" group',
name, arg));
} else {
throw new Error(format('unknown option: "-%s"', name));
}
} else if (this.optionTakesArg(option)) {
break;
}
j++;
}
j = 1;
while (allFound && j < arg.length) {
var name = arg[j];
var val = arg.slice(j + 1); // option val if it takes an arg
var option = this.optionFromName[name];
var takesArg = this.optionTakesArg(option);
if (!takesArg) {
addOpt(option, '-'+name, option.key, true, 'argv');
} else if (val) {
addOpt(option, '-'+name, option.key, val, 'argv');
break;
} else {
if (i + 1 >= args.length) {
throw new Error(format('do not have enough args '
+ 'for "-%s" option', name));
}
addOpt(option, '-'+name, option.key, args[i + 1], 'argv');
i++;
break;
}
j++;
}
// An interspersed arg
} else if (this.interspersed) {
_args.push(arg);
// An arg and interspersed args are not allowed, so done options.
} else {
break outer;
}
i++;
}
_args = _args.concat(args.slice(i));
// Parse environment.
Object.keys(this.optionFromEnv).forEach(function (envname) {
var val = env[envname];
if (val === undefined)
return;
var option = self.optionFromEnv[envname];
if (opts[option.key] !== undefined)
return;
var takesArg = self.optionTakesArg(option);
if (takesArg) {
addOpt(option, envname, option.key, val, 'env');
} else if (val !== '') {
// Boolean envvar handling:
// - VAR=<empty-string> not set (as if the VAR was not set)
// - VAR=0 false
// - anything else true
addOpt(option, envname, option.key, (val !== '0'), 'env');
}
});
// Apply default values.
this.options.forEach(function (o) {
if (opts[o.key] === undefined) {
if (o.default !== undefined) {
opts[o.key] = o.default;
} else if (o.type && optionTypes[o.type].default !== undefined) {
opts[o.key] = optionTypes[o.type].default;
}
}
});
opts._order = _order;
opts._args = _args;
return opts;
};
/**
* Return help output for the current options.
*
* E.g.: if the current options are:
* [{names: ['help', 'h'], type: 'bool', help: 'Show help and exit.'}]
* then this would return:
* ' -h, --help Show help and exit.\n'
*
* @param config {Object} Config for controlling the option help output.
* - indent {Number|String} Default 4. An indent/prefix to use for
* each option line.
* - nameSort {String} Default is 'length'. By default the names are
* sorted to put the short opts first (i.e. '-h, --help' preferred
* to '--help, -h'). Set to 'none' to not do this sorting.
* - maxCol {Number} Default 80. Note that long tokens in a help string
* can go past this.
* - helpCol {Number} Set to specify a specific column at which
* option help will be aligned. By default this is determined
* automatically.
* - minHelpCol {Number} Default 20.
* - maxHelpCol {Number} Default 40.
* - includeEnv {Boolean} Default false. If true, a note stating the `env`
* envvar (if specified for this option) will be appended to the help
* output.
* - includeDefault {Boolean} Default false. If true, a note stating
* the `default` for this option, if any, will be appended to the help
* output.
* - helpWrap {Boolean} Default true. Wrap help text in helpCol..maxCol
* bounds.
* @returns {String}
*/
Parser.prototype.help = function help(config) {
config = config || {};
assert.object(config, 'config');
var indent = makeIndent(config.indent, 4, 'config.indent');
var headingIndent = makeIndent(config.headingIndent,
Math.round(indent.length / 2), 'config.headingIndent');
assert.optionalString(config.nameSort, 'config.nameSort');
var nameSort = config.nameSort || 'length';
assert.ok(~['length', 'none'].indexOf(nameSort),
'invalid "config.nameSort"');
assert.optionalNumber(config.maxCol, 'config.maxCol');
assert.optionalNumber(config.maxHelpCol, 'config.maxHelpCol');
assert.optionalNumber(config.minHelpCol, 'config.minHelpCol');
assert.optionalNumber(config.helpCol, 'config.helpCol');
assert.optionalBool(config.includeEnv, 'config.includeEnv');
assert.optionalBool(config.includeDefault, 'config.includeDefault');
assert.optionalBool(config.helpWrap, 'config.helpWrap');
var maxCol = config.maxCol || 80;
var minHelpCol = config.minHelpCol || 20;
var maxHelpCol = config.maxHelpCol || 40;
var lines = [];
var maxWidth = 0;
this.options.forEach(function (o) {
if (o.hidden) {
return;
}
if (o.group !== undefined && o.group !== null) {
// We deal with groups in the next pass
lines.push(null);
return;
}
var type = optionTypes[o.type];
var arg = o.helpArg || type.helpArg || 'ARG';
var line = '';
var names = o.names.slice();
if (nameSort === 'length') {
names.sort(function (a, b) {
if (a.length < b.length)
return -1;
else if (b.length < a.length)
return 1;
else
return 0;
})
}
names.forEach(function (name, i) {
if (i > 0)
line += ', ';
if (name.length === 1) {
line += '-' + name
if (type.takesArg)
line += ' ' + arg;
} else {
line += '--' + name
if (type.takesArg)
line += '=' + arg;
}
});
maxWidth = Math.max(maxWidth, line.length);
lines.push(line);
});
// Add help strings.
var helpCol = config.helpCol;
if (!helpCol) {
helpCol = maxWidth + indent.length + 2;
helpCol = Math.min(Math.max(helpCol, minHelpCol), maxHelpCol);
}
var i = -1;
this.options.forEach(function (o) {
if (o.hidden) {
return;
}
i++;
if (o.group !== undefined && o.group !== null) {
if (o.group === '') {
// Support a empty string "group" to have a blank line between
// sets of options.
lines[i] = '';
} else {
// Render the group heading with the heading-specific indent.
lines[i] = (i === 0 ? '' : '\n') + headingIndent +
o.group + ':';
}
return;
}
var helpDefault;
if (config.includeDefault) {
if (o.default !== undefined) {
helpDefault = format('Default: %j', o.default);
} else if (o.type && optionTypes[o.type].default !== undefined) {
helpDefault = format('Default: %j',
optionTypes[o.type].default);
}
}
var line = lines[i] = indent + lines[i];
if (!o.help && !(config.includeEnv && o.env) && !helpDefault) {
return;
}
var n = helpCol - line.length;
if (n >= 0) {
line += space(n);
} else {
line += '\n' + space(helpCol);
}
var helpEnv = '';
if (o.env && o.env.length && config.includeEnv) {
helpEnv += 'Environment: ';
var type = optionTypes[o.type];
var arg = o.helpArg || type.helpArg || 'ARG';
var envs = (Array.isArray(o.env) ? o.env : [o.env]).map(
function (e) {
if (type.takesArg) {
return e + '=' + arg;
} else {
return e + '=1';
}
}
);
helpEnv += envs.join(', ');
}
var help = (o.help || '').trim();
if (o.helpWrap !== false && config.helpWrap !== false) {
// Wrap help description normally.
if (help.length && !~'.!?"\''.indexOf(help.slice(-1))) {
help += '.';
}
if (help.length) {
help += ' ';
}
help += helpEnv;
if (helpDefault) {
if (helpEnv) {
help += '. ';
}
help += helpDefault;
}
line += textwrap(help, maxCol - helpCol).join(
'\n' + space(helpCol));
} else {
// Do not wrap help description, but indent newlines appropriately.
var helpLines = help.split('\n').filter(
function (ln) { return ln.length });
if (helpEnv !== '') {
helpLines.push(helpEnv);
}
if (helpDefault) {
helpLines.push(helpDefault);
}
line += helpLines.join('\n' + space(helpCol));
}
lines[i] = line;
});
var rv = '';
if (lines.length > 0) {
rv = lines.join('\n') + '\n';
}
return rv;
};
/**
* Return a string suitable for a Bash completion file for this tool.
*
* @param args.name {String} The tool name.
* @param args.specExtra {String} Optional. Extra Bash code content to add
* to the end of the "spec". Typically this is used to append Bash
* "complete_TYPE" functions for custom option types. See
* "examples/ddcompletion.js" for an example.
* @param args.argtypes {Array} Optional. Array of completion types for
* positional args (i.e. non-options). E.g.
* argtypes = ['fruit', 'veggie', 'file']
* will result in completion of fruits for the first arg, veggies for the
* second, and filenames for the third and subsequent positional args.
* If not given, positional args will use Bash's 'default' completion.
* See `specExtra` for providing Bash `complete_TYPE` functions, e.g.
* `complete_fruit` and `complete_veggie` in this example.
*/
Parser.prototype.bashCompletion = function bashCompletion(args) {
assert.object(args, 'args');
assert.string(args.name, 'args.name');
assert.optionalString(args.specExtra, 'args.specExtra');
assert.optionalArrayOfString(args.argtypes, 'args.argtypes');
return bashCompletionFromOptions({
name: args.name,
specExtra: args.specExtra,
argtypes: args.argtypes,
options: this.options
});
};
// ---- Bash completion
const BASH_COMPLETION_TEMPLATE_PATH = path.join(
__dirname, '../etc/dashdash.bash_completion.in');
/**
* Return the Bash completion "spec" (the string value for the "{{spec}}"
* var in the "dashdash.bash_completion.in" template) for this tool.
*
* The "spec" is Bash code that defines the CLI options and subcmds for
* the template's completion code. It looks something like this:
*
* local cmd_shortopts="-J ..."
* local cmd_longopts="--help ..."
* local cmd_optargs="-p=tritonprofile ..."
*
* @param args.options {Array} The array of dashdash option specs.
* @param args.context {String} Optional. A context string for the "local cmd*"
* vars in the spec. By default it is the empty string. When used to
* scope for completion on a *sub-command* (e.g. for "git log" on a "git"
* tool), then it would have a value (e.g. "__log"). See
* <http://github.com/trentm/node-cmdln> Bash completion for details.
* @param opts.includeHidden {Boolean} Optional. Default false. By default
* hidden options and subcmds are "excluded". Here excluded means they
* won't be offered as a completion, but if used, their argument type
* will be completed. "Hidden" options and subcmds are ones with the
* `hidden: true` attribute to exclude them from default help output.
* @param args.argtypes {Array} Optional. Array of completion types for
* positional args (i.e. non-options). E.g.
* argtypes = ['fruit', 'veggie', 'file']
* will result in completion of fruits for the first arg, veggies for the
* second, and filenames for the third and subsequent positional args.
* If not given, positional args will use Bash's 'default' completion.
* See `specExtra` for providing Bash `complete_TYPE` functions, e.g.
* `complete_fruit` and `complete_veggie` in this example.
*/
function bashCompletionSpecFromOptions(args) {
assert.object(args, 'args');
assert.object(args.options, 'args.options');
assert.optionalString(args.context, 'args.context');
assert.optionalBool(args.includeHidden, 'args.includeHidden');
assert.optionalArrayOfString(args.argtypes, 'args.argtypes');
var context = args.context || '';
var includeHidden = (args.includeHidden === undefined
? false : args.includeHidden);
var spec = [];
var shortopts = [];
var longopts = [];
var optargs = [];
(args.options || []).forEach(function (o) {
if (o.group !== undefined && o.group !== null) {
// Skip group headers.
return;
}
var optNames = o.names || [o.name];
var optType = getOptionType(o.type);
if (optType.takesArg) {
var completionType = o.completionType ||
optType.completionType || o.type;
optNames.forEach(function (optName) {
if (optName.length === 1) {
if (includeHidden || !o.hidden) {
shortopts.push('-' + optName);
}
// Include even hidden options in `optargs` so that bash
// completion of its arg still works.
optargs.push('-' + optName + '=' + completionType);
} else {
if (includeHidden || !o.hidden) {
longopts.push('--' + optName);
}
optargs.push('--' + optName + '=' + completionType);
}
});
} else {
optNames.forEach(function (optName) {
if (includeHidden || !o.hidden) {
if (optName.length === 1) {
shortopts.push('-' + optName);
} else {
longopts.push('--' + optName);
}
}
});
}
});
spec.push(format('local cmd%s_shortopts="%s"',
context, shortopts.sort().join(' ')));
spec.push(format('local cmd%s_longopts="%s"',
context, longopts.sort().join(' ')));
spec.push(format('local cmd%s_optargs="%s"',
context, optargs.sort().join(' ')));
if (args.argtypes) {
spec.push(format('local cmd%s_argtypes="%s"',
context, args.argtypes.join(' ')));
}
return spec.join('\n');
}
/**
* Return a string suitable for a Bash completion file for this tool.
*
* @param args.name {String} The tool name.
* @param args.options {Array} The array of dashdash option specs.
* @param args.specExtra {String} Optional. Extra Bash code content to add
* to the end of the "spec". Typically this is used to append Bash
* "complete_TYPE" functions for custom option types. See
* "examples/ddcompletion.js" for an example.
* @param args.argtypes {Array} Optional. Array of completion types for
* positional args (i.e. non-options). E.g.
* argtypes = ['fruit', 'veggie', 'file']
* will result in completion of fruits for the first arg, veggies for the
* second, and filenames for the third and subsequent positional args.
* If not given, positional args will use Bash's 'default' completion.
* See `specExtra` for providing Bash `complete_TYPE` functions, e.g.
* `complete_fruit` and `complete_veggie` in this example.
*/
function bashCompletionFromOptions(args) {
assert.object(args, 'args');
assert.object(args.options, 'args.options');
assert.string(args.name, 'args.name');
assert.optionalString(args.specExtra, 'args.specExtra');
assert.optionalArrayOfString(args.argtypes, 'args.argtypes');
// Gather template data.
var data = {
name: args.name,
date: new Date(),
spec: bashCompletionSpecFromOptions({
options: args.options,
argtypes: args.argtypes
}),
};
if (args.specExtra) {
data.spec += '\n\n' + args.specExtra;
}
// Render template.
var template = fs.readFileSync(BASH_COMPLETION_TEMPLATE_PATH, 'utf8');
return renderTemplate(template, data);
}
// ---- exports
function createParser(config) {
return new Parser(config);
}
/**
* Parse argv with the given options.
*
* @param config {Object} A merge of all the available fields from
* `dashdash.Parser` and `dashdash.Parser.parse`: options, interspersed,
* argv, env, slice.
*/
function parse(config) {
assert.object(config, 'config');
assert.optionalArrayOfString(config.argv, 'config.argv');
assert.optionalObject(config.env, 'config.env');
var config = shallowCopy(config);
var argv = config.argv;
delete config.argv;
var env = config.env;
delete config.env;
var parser = new Parser(config);
return parser.parse({argv: argv, env: env});
}
/**
* Add a new option type.
*
* @params optionType {Object}:
* - name {String} Required.
* - takesArg {Boolean} Required. Whether this type of option takes an
* argument on process.argv. Typically this is true for all but the
* "bool" type.
* - helpArg {String} Required iff `takesArg === true`. The string to
* show in generated help for options of this type.
* - parseArg {Function} Require. `function (option, optstr, arg)` parser
* that takes a string argument and returns an instance of the
* appropriate type, or throws an error if the arg is invalid.
* - array {Boolean} Optional. Set to true if this is an 'arrayOf' type
* that collects multiple usages of the option in process.argv and
* puts results in an array.
* - arrayFlatten {Boolean} Optional. XXX
* - default Optional. Default value for options of this type, if no
* default is specified in the option type usage.
*/
function addOptionType(optionType) {
assert.object(optionType, 'optionType');
assert.string(optionType.name, 'optionType.name');
assert.bool(optionType.takesArg, 'optionType.takesArg');
if (optionType.takesArg) {
assert.string(optionType.helpArg, 'optionType.helpArg');
}
assert.func(optionType.parseArg, 'optionType.parseArg');
assert.optionalBool(optionType.array, 'optionType.array');
assert.optionalBool(optionType.arrayFlatten, 'optionType.arrayFlatten');
optionTypes[optionType.name] = {
takesArg: optionType.takesArg,
helpArg: optionType.helpArg,
parseArg: optionType.parseArg,
array: optionType.array,
arrayFlatten: optionType.arrayFlatten,
default: optionType.default
}
}
function getOptionType(name) {
assert.string(name, 'name');
return optionTypes[name];
}
/**
* Return a synopsis string for the given option spec.
*
* Examples:
* > synopsisFromOpt({names: ['help', 'h'], type: 'bool'});
* '[ --help | -h ]'
* > synopsisFromOpt({name: 'file', type: 'string', helpArg: 'FILE'});
* '[ --file=FILE ]'
*/
function synopsisFromOpt(o) {
assert.object(o, 'o');
if (o.hasOwnProperty('group')) {
return null;
}
var names = o.names || [o.name];
// `type` here could be undefined if, for example, the command has a
// dashdash option spec with a bogus 'type'.
var type = getOptionType(o.type);
var helpArg = o.helpArg || (type && type.helpArg) || 'ARG';
var parts = [];
names.forEach(function (name) {
var part = (name.length === 1 ? '-' : '--') + name;
if (type && type.takesArg) {
part += (name.length === 1 ? ' ' + helpArg : '=' + helpArg);
}
parts.push(part);
});
return ('[ ' + parts.join(' | ') + ' ]');
};
module.exports = {
createParser: createParser,
Parser: Parser,
parse: parse,
addOptionType: addOptionType,
getOptionType: getOptionType,
synopsisFromOpt: synopsisFromOpt,
// Bash completion-related exports
BASH_COMPLETION_TEMPLATE_PATH: BASH_COMPLETION_TEMPLATE_PATH,
bashCompletionFromOptions: bashCompletionFromOptions,
bashCompletionSpecFromOptions: bashCompletionSpecFromOptions,
// Export the parseFoo parsers because they might be useful as primitives
// for custom option types.
parseBool: parseBool,
parseString: parseString,
parseNumber: parseNumber,
parseInteger: parseInteger,
parsePositiveInteger: parsePositiveInteger,
parseDate: parseDate
};
Zerion Mini Shell 1.0