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GUY.props: Common Operations on Object Properties
GUY.async: Asynchronous HelpersGUY.nowait: De-Asyncify JS Async FunctionsGUY.process: Process-Related UtilitiesGUY.lft: Freezing ObjectsGUY.fs.walk_lines(), GUY.str.walk_lines() and GUY.fs.walk_buffers()GUY.fs: File-Related StuffGUY.src: JS Source Code AnalysisGUY.trmGUY.watchGUY.setsGUY.strGUY.samesameGUY.rndGUY.tempGUY.datetimecnd, intertype)GUY.${library_name}GUY.props.def_oneoff(), therefore dependencies (which are declared
peer dependencies) will only be require()d when needed.GUY.props: Common Operations on Object PropertiesGUY.props.def: ( target, name, cfg ) -> is just another name for Object.defineProperty().
GUY.props.hide: ( object, name, value ) -> is a shortcut to define a non-enumerable property as in
Object.defineProperty object, name, { enumerable: false, value, }.
GUY.props.xray: ( owner, host ) ->—A little bit the inverse to GUY.props.hide(), it will return an
object with all key/value pairs set that were found on owner after applying GUY.props.keys owner, { hidden: true, symbols: true, builtins: false, }. When host is set, that value will be used to store the
key/value pairs in, possibly overwriting existing keys. This method is useful for printing and debugging
objects with non-enumerable and/or symbol keys.
GUY.props.def_oneoff: ()
GUY.props.pick_with_fallback = ( d, fallback, keys... ) ->—Given an object d, a fallback value and
some keys, return an object that whose keys are the ones passed in, and whose values are either the
same as found in d, or fallback in case a key is missing in d or set to undefined. If d[ key ]
is null, it will be replaced by fallback. When no keys are given, an empty object will be returned.
GUY.props.nullify_undefined = ( d ) ->—Given an object d, return a copy of it where all undefined
values are replaced with null. In case d is null or undefined, an empty object will be returned.
GUY.props.omit_nullish = ( d ) ->—Given an object d, return a copy of it where all undefined and
null values are not set. In case d is null or undefined, an empty object will be returned.
GUY.props.nonull_assign = ( first, others... ) ->—Given one or more objects, return what { first..., other_0..., 0ther_1..., ... } would return after removing all null and undefined attributes
from all the other values, i.e. Object.assign {}, first, ( @omit_nullish other for other in others ).... This method is useful if you have an object with default values and want to derive settings by
passing in settings where null and undefined mean 'unset', 'don't care'.
GUY.props.crossmerge = ( cfg ) ->—Given an object keys and an object values, return a new object
whose keys come from the former and whose values come fom the latter. Should there be a key in keys that
is not set in values, an error will be thrown unless fallback has been set (to any value, inlcuding
undefined). This method calls GUY.props.keys() and will accept the cfg settings used there
(allow_any, symbols, builtins, hidden, depth).
GUY.props.has = ( x, key ) ->—Given any value x, return whether the value has a given property
(key). This is a safe version of Reflect.has() that never throws an error. Like direct property access
(using x.key or x[ 'key' ]) but unlike Object.getOwnPropertyDescriptor() &c, GUY.props.has() looks
into the prototype chain; like Object.getOwnPropertyDescriptor(), it does not trigger property getters.
GUY.props.get = ( x, key, fallback ) ->—Given any value x, return the value of property named in
key. If that property is missing, throw an error, but when fallback has been given, return fallback
instead. Using GUY.props.get x, 'foo' is like saying x.foo or x[ 'foo' ] except that it doesn't
tolerate missing property keys; using it with a fallback as in GUY.props.get x, 'foo', undefined is like
saying x.foo or x[ 'foo' ] except that it also works for null and undefined.
Using GUY.props.has() and GUY.props.get() it is always possible to circumvent errors being thrown and
instead do value-based error handling (and raise one own's errors where seen fit). One pattern to do so is
to define a private Symbol instead of relying on undefined that could have been caused by all kinds of
circumstances. Here's a real-life example; it was created in a context where instances of the Strict_owner
class (for which see below) are prevalent (i.e. those objects will throw an error instead of returning
undefined as is the standard in JS). This function will return the length of a value x where that
attribute is present (as in strings and arrays), or else its size where that is present (as in sets and
maps), else it will return fallback where given, or resort to throwing an error:
notavalue = Symbol 'notavalue'
size_of = ( x, fallback = misfit ) ->
return R unless ( R = GUY.props.get x, 'length', notavalue ) is notavalue
return R unless ( R = GUY.props.get x, 'size', notavalue ) is notavalue
return fallback unless fallback is misfit
throw new Error "expected an object with `x.length` or `x.size`, got a #{typeof x} with neither"
GUY.props.resolve_property_chain = ( owner, property_chain ) ->—Given an owner value (typically an
object) and a property_chain as a list of names, repeatedly apply the names, first against the owner,
then the next name against that result and so on. This allows one to programmatically resolve chained
property access and to parametrize a literal owner.first.second.other.last as
GUY.props.resolve_property_chain owner, [ 'first', 'second', 'other', 'last', ].
GUY.props._shallow_copy = ( d ) ->—Given object d, return a shallow copy of it using the technique
demonstrated in the MDN documentation for
Object.getOwnPropertyDescriptors():
( d ) -> Object.create ( Object.getPrototypeOf d ), ( Object.getOwnPropertyDescriptors d ). This method
is not yet official part of the API because it may get an extension to work transparently with primitive
values.
GUY.props.keys()GUY.props.keys: () =>—Like Object.keys( t ), Reflect.ownKeys( t ) (which is equivalent to
Object.getOwnPropertyNames( target ).concat(Object.getOwnPropertySymbols( target ))) but more versatileGUY.props.keys() can retrieve or skip non-enumerable (a.k.a. 'hidden') keysGUY.props.keys() can retrieve only own keys (with { depth: 0 }) or descend into the prototype chain
for any number of steps: { depth: null, } (the default, equivalent to { depth: Infinity, }) will
descend into the prototype chain or e.g. { depth: 1, }GUY.props.keys() can retrieve string keys as well as symbol keys with { symbols: true, }GUY.props.keys() works for all JS values, including null and undefined when { allow_any: true, }
is set (the default)GUY.props.keys() can retrieve hidden (i.e. non-enumerable) keys with { hidden: true, }GUY.props.keys() can walk in depth-first order by setting { depth_first: true, }GUY.props.keys() can retrieve builtins with { builtins: true, }; observe that since builtins are
always hidden, { builtins: true, hidden: false, } makes no sense and causes a validation error.lst = [ 'x', ]
( Object.keys lst )
# [ '0', ]
( ( k for k of lst ) )
# [ '0', ]
( GUY.props.keys lst )
# [ '0', ]
( GUY.props.keys lst, { symbols: true, builtins: true, } )
# [ '0', 'length', 'constructor', 'concat', 'copyWithin', 'fill', 'find', 'findIndex', 'lastIndexOf',
# 'pop', 'push', 'reverse', 'shift', 'unshift', 'slice', 'sort', 'splice', 'includes', 'indexOf', 'join',
# 'keys', 'entries', 'values', 'forEach', 'filter', 'flat', 'flatMap', 'map', 'every', 'some', 'reduce',
# 'reduceRight', 'toLocaleString', 'toString', 'at', 'findLast', 'findLastIndex', Symbol.iterator,
# Symbol.unscopables, '__defineGetter__', '__defineSetter__', 'hasOwnProperty', '__lookupGetter__',
# '__lookupSetter__', 'isPrototypeOf', 'propertyIsEnumerable', 'valueOf', '__proto__' ]
( GUY.props.keys Array, { symbols: true, builtins: true, } )
# [ 'length', 'name', 'prototype', 'isArray', 'from', 'of', Symbol.species, 'arguments', 'caller',
# 'constructor', 'apply', 'bind', 'call', 'toString', Symbol.hasInstance, '__defineGetter__',
# '__defineSetter__', 'hasOwnProperty', '__lookupGetter__', '__lookupSetter__', 'isPrototypeOf',
# 'propertyIsEnumerable', 'valueOf', '__proto__', 'toLocaleString' ]
GUY.props.get_prototype_chain()GUY.props.get_prototype_chain x: given an object x, returns the instance, its prototype, and the
transitive prototypes of the prototype. The method will return an empty list for null and undefined
GUY.props.tree()GUY.props.tree() is the logical dual to GUY.props.keys(): instead of descending into the prototype
chain, tree() climbs through the key/value pairs attached to an object and, recursively, through the trees
of each value's key/value pairs. In default mode, the method returns a list of lists of names ('paths'):
log = console.log
{ inspect, } = require 'util'
d = { a: [ 0, 1, 2, ], e: { g: { some: 'thing', }, h: 42, h: null, }, empty: {}, }
for path in GUY.props.tree d
log inspect path
This will print:
[ 'a' ]
[ 'a', '0' ]
[ 'a', '1' ]
[ 'a', '2' ]
[ 'e' ]
[ 'e', 'g' ]
[ 'e', 'g', 'some' ]
[ 'e', 'h' ]
[ 'empty' ]
The default configuration for the tree() method is { allow_any: true, symbols: false, builtins: false, hidden: false, depth: null, evaluate: null, sep: null, }, with the last two settings being specific to
tree(), and the first five having the same meaning as for GUY.props.keys(), q.v.
To turn the result into a list of strings, pass in a property sep:
...
for path in GUY.props.tree d, { sep: '.', }
...
'a'
'a.0'
'a.1'
'a.2'
'e'
'e.g'
'e.g.some'
'e.h'
'empty'
The evaluate setting can be set to a function which will be called with an object { owner, key, value, }
where owner is the current object being iterated over, and key/value the current property name and
value. The evaluate function should return true, false, or a string that may contain the words take
and/or descend; the default (when no evaluate function is given) is take,descend, meaning all keys
will be both included in the list as well as descended into. true is equivalent to take,descend; false
means skip this property altogether. In the below example, we use the evaluate setting to avoid descending
into arrays and to include only the tips (leaves, endpoints) of the tree:
evaluate = ({ owner, key, value, }) ->
return 'take' if Array.isArray value
return 'take' unless GUY.props.has_keys value
return 'descend'
...
for path in GUY.props.tree d, { evaluate, sep: '.', }
...
'a'
'e.g.some'
'e.h'
'empty'
JavaScript is famously forgiving when it comes to accessing non-existing object properties. However this
lenience is also conducive to silent failure. Strict_owner is an ES6 class that aims to provide users with
a convenient mechanism to produce object that throw an error when a non-existing property is being accessed.
When you extend your class with GUY.props.Strict_owner, instance of your class will now throw an error
when a non-existing property is accessed.
Note Most often one will want to define a class that extends Strict_owner, however, it is also
possible to pass in an arbitrary object—including a function—as property target to the constructor, e.g.
f = ( x ) -> x * 2
x = new GUY.props.Strict_owner { target: f, }
Note As of Guy v6, special methods
get()andset()have been removed fromStrict_owner. They have been replaced with a much cleaner and more correct implementation asGUY.props.get()andGUY.props.has(). These methods are more versatile, too, since they can be used with any JS value (including the always-problematicnullandundefined).
Note
GUY.props.Strict_owneris implemented using an ES6Proxy. While proxies are powerfool tools they're also notoriously hard to get right because of the many methods one could/should/must implement and which all have to act in mutually consistent ways. As a result, my personal recommendation here is to try hard not use a proxy and use another methodology to achieve a workable solution where possible. One thing that will probably not work is proxying a proxy: When you have aStrict_ownerobject (which already is a proxy) and wrap it in another proxy, chances are you'll get errors likeinstance does not have property '0'when attempting to usenode:util.inspect()on that instance. I have been so far unable to fix that bug and since been looking for a solution that works without the need for a double proxy in that other codebase.
In order to get an object which is sealed and or frozen, use properties seal and freeze, respectively:
d = { x: 42, }
dso = new GUY.props.Strict_owner { target: d, seal: true, freeze: true, }
# this works:
dso.x # 42
# but none of these work:
# Strict owner ship means unknown properties cannot be accessed:
dso.y # Strict_owner instance does not have property 'y'
# Properties of a frozen object cannot be re-assigned:
dso.x = 48 # TypeError: Cannot assign to read only property 'x'
# Properties cannot be added to a sealed object (also implied by being frozen):
dso.y = 'something' # TypeError: Cannot define property y, object is not extensible
In addition, when property oneshot is set (and neither seal nor freeze), properties can be set once,
but not get re-assigned. In case non-re-assignable values should also be immutable, consider to set frozen
objects:
d = { x: 42, }
dso = new GUY.props.Strict_owner { target: d, oneshot: true, }
dso.xy = new GUY.props.Strict_owner { target: { foo: 'bar', }, freeze: true, }
# dso.x = 123 # Strict_owner instance already has property 'x'
# dso.xy = {} # Strict_owner instance already has property 'xy'
# dso.xy.foo = 'gnu' # TypeError: Cannot assign to read only property 'foo'
Observe that because all of the sealing, freezing and one-shot business is performed on the proxy, not on the target object, we can still manipulate that one:
debug '^35345^', dso # { x: 42, xy: { foo: 'bar' } }
debug '^35345^', d # { x: 42, xy: { foo: 'bar' } }
# we *can* still manipulate the underlying object:
d.x = 123
debug '^35345^', dso # { x: 123, xy: { foo: 'bar' } }
debug '^35345^', d # { x: 123, xy: { foo: 'bar' } }
It is possible to lift the strict behavior of Strict_owner instances by using Strict_owner.set_locked false and resume strict behavior with Strict_owner.set_locked true.
return "#{instance.constructor.name}" if key is Symbol.toStringTagreturn target.constructor if key is 'constructor'return target.toString if key is 'toString'return target.call if key is 'call'return target.apply if key is 'apply'return target[ Symbol.iterator ] if key is Symbol.iteratorreturn target[ node_inspect ] if key is node_inspectreturn target[ 0 ] if key is '0'GUY.async: Asynchronous HelpersThese 'five letter' methods are convenience methods in the sense that they are very thin shims over the somewhat less convenient JavaScript methods. For many people, the most strightforward way to understand what these methods do will be to read the very simple definitions:
every: ( dts, f ) -> setInterval f, dts * 1000after: ( dts, f ) -> setTimeout f, dts * 1000cease: ( toutid ) -> clearTimeout toutidsleep: ( dts ) -> new Promise ( done ) => setTimeout done, dts * 1000defer: ( f = -> ) -> await sleep 0; return await f()In each case, dts denotes an interval (delta time) measured in seconds (not milliseconds) and f
denotes a function. every() and after() return so-called timeout IDs (toutids), i.e. values that are
recognized by cease() (clearTimeout(), clearInterval()) to stop a one-off or repetetive timed function
call. sleep() returns a promise that should be awaited as in await sleep 3, which will allow another
task on the event loop to return and resume execution no sooner than after 3000 milliseconds have elapsed.
Finally, there is defer(), which should also be awaited. It is a special use-case of sleep() where the
timeout is set to zero, so the remaining effect is that other tasks on the event loop get a chance to run.
It accepts an optional function argument whose (synchronous or asynchronous) result will be returned.
GUY.nowait: De-Asyncify JS Async FunctionsNote Due to ongoing issues when compiling the deasync module that this functionality
is implemented in, guy-nowaithas been removed from this release.
GUY.nowait.for_callbackable: ( fn_with_callback ) ->—given an asynchronous function afc that
accepts a NodeJS-style callback (as in afc v1, v2, ..., ( error, result ) -> ...), returns a synchronous
function sf that can be used without a callback (as in result = sf v1, v2, ...).
GUY.nowait.for_awaitable: ( fn_with_promise ) ->—given an asynchronous function afp that can be
used with await (as in result = await afp v1, v2, ...) returns a synchronous function f that can be
used without await (as in result = sf v1, v2, ...).
GUY.process: Process-Related UtilitiesPeer Dependencies: sindresorhus/exit-hook
GUY.process.on_exit: ( fn ) => ...—call fn() before process exits. Convenience link for
sindresorhus/exit-hook, which see for details. Note
When installing this peer dependency, make sure to do so with the last CommonJS version added, as in npm install exit-hook@2.2.1.GUY.lft: Freezing ObjectsGUY.left.freeze() and GUY.lft.lets() provide access to the epynomous methods in
letsfreezethat. freeze() is basically
Object.freeze() for nested objects, while d = lets d, ( d ) -> mutate d provides a handy way to mutate
and re-assign a copy of a frozen object. See the
documentation for details.
GUY.fs.walk_lines(), GUY.str.walk_lines() and GUY.fs.walk_buffers()GUY.fs.walk_lines = ( path, cfg ) ->—Given a path, return a synchronous iterator over file
lines. This is the most hassle-free approach to synchronously obtain lines of text files in NodeJS that
I'm aware of, yet. The optional cfg argument may be an object with a single property decode; when set
to false, walk_lines() will iterate over buffers instead of strings.
Behavior regarding terminal newline characters: The following invariant shall hold:
FS = require 'node:fs'
file_content = FS.readFileSync path, { encoding: 'utf-8', }
lines_1 = file_content.split '\n'
lines_2 = [ ( GUY.fs.walk_lines path )..., ]
( JSON.stringify lines_1 ) == ( JSON.stringify lines_2 )
In other words, the lines iterated over by GUY.fs.walk_lines() are the same lines as would be obtained
by splitting the file content using String::split(), meaning that
( '\n' ).split /\r\n|\r|\n/ gives [ '', '', ])( '' ).split '\n' gives [ '', ])wc when used with the --lines option will
often disagree with those obtained with GUY.fs.walk_lines() (or wplitting with /\r\n|\r|\n/).
However, this should not be a cause for concern because a file containing the text 1\n2\n3 will be
reported as having 2 lines by wc, and one will be hard pressed to find people who'd defend that
design decision, or a text editor which will not show digits 1 to 3 on three separate lines
numbered 1, 2, and 3.The newline character sequences recognized by GUY.fs.walk_lines() are
\r = U+000d Carriage Return (CR) (ancient Macs)\n = U+000a Line Feed (LF) (Unix, Linux)\r\n = U+000d U+00a0 Carriage Return followed by Line Feed (CRLF) (Windows)\r\r\n\r\n\n\n will be parsed as \r, \r\n, \r\n,
\n, \n, that is, as six empty lines, as two of the line feeds are pre-empted by the preceding
carriage returns. This behavior is consistent with the text of the file being split as
'\r\r\n\r\n\n\n'.split /\r\n|\r|\n/, which gives [ '', '', '', '', '', '' ]. This is, incidentally,
also what pico and Sublime Text 4 (on Linux) and Textpad
8.15 (on Wine under Linux) show, although Notepad (on
Wine under Linux) thinks the file in question has only 5 lines.GUY.str.walk_lines() behaves like GUY.fs.walk_lines(), although it does not yield buffers (yet) amd
has no way to set the chunk size
both GUY.str.walk_lines() and GUY.fs.walk_lines() will return right-trimmed lines (i.e. remove
whitespace from the end of the string) unless a setting trim: false is included as the second argument
to the method (as in, walk_lines path, { trim: false, }). With GUY.fs.walk_lines(), trimming is only
available if lines are decoded, so when one calls walk_lines path, { trim: false, encoding: null, } to
get buffers, those will not be trimmed.
both GUY.str.walk_lines() and GUY.fs.walk_lines() accept configuration settings prepend and append
which allow to prefix and suffix each line with a given string. Appending will happen after whitespace
trimming, where applicable.
GUY.fs.walk_buffers = ( path, cfg ) ->—Given a path, return a synchronous iterator over buffers
representing the file contents, the invariant being that the concatenation of the buffers compares equal
to reading the entire file in a single go:
( Buffer.compare ( Buffer.concat [ ( GUY.fs.walk_buffers path )..., ] ), ( FS.readFileSync path ) ) == 0
Where deemed necessary, cfg.chunk_size can be set to an arbitrary integer greater than 0 (default: 16
KiB).
GUY.fs.walk_lines_with_positions = ( path, cfg ) ->—Same as GUY.fs.walk_lines(), but yields
objects of the shape { lnr, line, eol, } where lnr is the 1-based line number, line is the (by
default, when not requesting buffers) trimmed 'material' of the line (identical to what the walk_lines()
methods yield), and eol represents the bytes or characters that were recognized as the line ending.
eol may be a single CR (\r, U+000d), a single LF (\n, U+000a; standard on Linux), a two-byte
CRLF (\r\n, standard on Windows), or an empty string or buffer (the latter only at the end of a string
or file). None of these attributes will ever be null, so one can always reconstruct the entire file
complete with positions indicated by line numbers, line-local or file-global UTF-16 code unit
indexes, code point indexes or byte offsets, as seen
appropriate.
GUY.fs.walk_buffers_with_positions = ( path, cfg ) ->—Same as GUY.fs.walk_buffers(), but yields
objects of the shape { buffer, byte_idx, } where byte_idx is the 0-based byte index into the
respective file.
GUY.fs: File-Related StuffGUY.fs.walk_circular_lines = ( path, cfg ) ->—Given a path, return an iterator over the lines in
the referenced file; optionally, when the iterator is exhausted (all lines have been read), restart from
the beginning. cfg may be an object with the keys:
loop_count—(cardinal; default: 1) controls how many times to loop over the file. Set to
+Infinity to allow for an unlimited number of laps.line_count—(cardinal; default: +Infinity) controls the maximum number of lines that will be
yielded.GUY.fs.walk_circular_lines() will act like GUY.fs.walk_lines.loop_count or line_count are set to 0.GUY.fs.get_content_hash = ( path, cfg ) ->—Given a path, return the
hexadecimal sha1 hash digest for its contents. On Linux, this uses sha1sum, and shasum on all
other systems.
GUY.fs.get_descriptor = ( path ) ->—Given a path, return an object with a succinct description of
the file system object that is pointed to by the path, if any. This method should only throw an error in
case of insufficient privileges to access a given file system object; it does not error just because a
given path does not point to anything in the file system.
Given some files like these:
lrwxrwxrwx 1 7 alice alice 2024-10-23 12:54 isa-nowhere-symlink -> nowhere
lrwxrwxrwx 1 20 alice alice 2024-10-23 12:53 isa-circular-symlink -> isa-circular-symlink
lrwxrwxrwx 1 8 alice alice 2024-10-23 12:52 isa-file-symlink -> isa-file
lrwxrwxrwx 1 10 alice alice 2024-10-23 12:52 isa-folder-symlink -> isa-folder
.rw-rw-r-- 1 0 alice alice 2024-10-23 12:51 isa-file
drwxrwxr-x 2 - alice alice 2024-10-23 12:51 isa-folder/
Running get_descriptor path aginst these files, we'll get a descriptor even when there's no
corresponding file, when a symlink doesn't point to anything, and when a symlink points to itself,
resulting in a nonsensical loop:
get_descriptor 'isa-nosuch' # { type: null, link: false, is_loop: false }
get_descriptor 'isa-nowhere-symlink' # { type: 'link', link: true, is_loop: false }
get_descriptor 'isa-circular-symlink' # { type: 'link', link: true, is_loop: true }
get_descriptor 'isa-file-symlink' # { type: 'file', link: true, is_loop: false }
get_descriptor 'isa-folder-symlink' # { type: 'folder', link: true, is_loop: false }
get_descriptor 'isa-file' # { type: 'file', link: false, is_loop: false }
get_descriptor 'isa-folder' # { type: 'folder', link: false, is_loop: false }
The rules for the properties type, link, is_loop are as follows:
type is null exactly when a path has no corresponding file system object, otherwise, it is one of
'link', 'file', 'folder', 'block', 'character', 'fifo', or 'socket';type indicated is the type of the target of a symlink if that symlink does have a target;
otherwise, it is the type of the file system object itself;link is true if the stat object returned by the node:fs lstatSync() method indicates a symlink,
and false otherwisetype: 'link' and link: true;
one can distinguish circular symlinks by property is_loop, which is only true in this case and
false in all others.GUY.src: JS Source Code AnalysisThis submodule needs peer-dependencies, install them with
npm install acorn acorn-loose acorn-walk astringor
pnpm add acorn acorn-loose acorn-walk astring
@STRICT_PARSER = require 'acorn'
@LOOSE_PARSER = require 'acorn-loose'
@AST_walk = require 'acorn-walk'
@ASTRING = require 'astring'
@parse = ( cfg ) =>—Given either a JS source text or a function, return an
ESTree-compliant AST. Should an error occur and fallback is set to
any value, that value will be returned; otherwise, the error will be thrown. The use parameter controls
which parser is used and can take on the values 'strict', 'strict,loose', and 'loose'. For many
settings 'strict,loose' will probably the right setting since the strict parser will balk already on
unnamed function declarations that are not part of assignment, while the 'loose' parser happily (and
correctly parses those). For this reason, the default setting is use: 'strict,loose'.
slug_node_from_simple_function = ( cfg ) =>—Same as slug_from_simple_function(), below, but
returns an AST node representing the result. You can manipulate the node if you want it and then pass it
to GUY.src._generate() to get it rendered as JS, but the result will slightly differ from what
slug_from_simple_function() would return for the same input because that function does some
post-processing on the source text to make it even terser.
slug_from_simple_function = ( cfg ) =>—Given the same cfg object one would use for
GUY.src.parse(), return a 'slug' (i.e. a condensed form) of its source text. This slug is defined to be
undefinedreturn: argument property of the ReturnStatement nodereturns: BlockStatement (i.e. the function
body) (???)Examples:
█ ( -> )
''
█ ( ( x ) -> 42 )
'42'
█ ( ( x ) -> ( not x? ) or ( @isa.object x ) or ( @isa.nonempty.text x ) )
'x == null || this.isa.object(x) || this.isa.nonempty.text(x)'
█ ( `function ( x ) { 42; }` )
'42;'
█ ( `function ( x ) { return 42; }` )
'42'
█ ( ( x ) -> if x? then true else false )
'if (x != null) { return true; } else { return false; }'
█ ( ( x ) -> ( not x? ) or ( @isa.object x ) or ( @isa.nonempty.text x ) )
'x == null || this.isa.object(x) || this.isa.nonempty.text(x)'
█ f3
'if (x > 0) { return true; } if (x < 0) { return false; } return null;'
GUY.trmnode:util.inspect(): GUY.trm.inspect(), GUY.trm.rpr()alert(), debug(), help(), info(), plain(), praise(), urge(), warn(),
whisper()GUY.trm.get_loggers badge where badge identifies your submoduleGUY.trm.log() writes undecorated stuff to process.stderr()GUY.trm.echo() writes undecorated stuff to process.stdout()GUY.trm.rpr to each argument independently, so echo a, b, c is like
console.log ( rpr a ), ( rpr b ), ( rpr c )GUY.trm.pen() returns string representation as used in GUY.trm.log() &cGUY.trm.strip_ansi: ( text ) -> uses RegEx from
(chalk)[https://raw.githubusercontent.com/chalk/ansi-regex/main/index.js] to strip ANSI codes from a given
stringGUY.watchGUY.watch.Watcher, GUY.watch.Reporting_watcher
GUY.watch.Watcher, declare any event handlers:
on_add: ( path ) -> ...on_change: ( path ) -> ...on_unlink: ( path ) -> ...on_add_folder: ( path ) -> ...on_unlink_folder: ( path ) -> ...on_all: ( key, path, d ) -> ...on_error: ( error ) -> ...on_ready: -> ...w = new My_watcher(),w.add_path() with glob any number of times to start watching for events on matched pathsawait w.stop() to stop watching (and exit the event loop, allowing NodeJS to terminate gracefully)GUY.setsOperations on sets, copied / modelled on JavaScript for impatient programmers (ES2022 edition): Missing Set operations
unite: ( P... ) ->—return the union of all sets passed inintersect: ( P... ) ->—return the intersection of all sets passed insubtract: ( a, b ) ->—return the set of elements of set a except for those that are also in set
bGUY.strescape_for_regex: ( text ) ->—escape text so it can safely be used as a regex, with all
meta-characters properly escaped.
SQL—a tag
function
that can be used to mark string literals as SQL which can then be properly treated by text editors that
support nested languages.
pluralize: ( word ) ->—assuming that word spells out an English word in the singular, return a
tentative pluralized version of the same. This is an adaption of Sindre Sorhus's
plur, modernized and minus the list of exceptions; it follows
these rules:
words ands in an uppercase letter, the suffix will be uppercase, too.GUY.samesameContains two methods, equals() and deep_copy(), that are thought to be among the best and fastest
implementations for the purposes of deep equality checking and deep copying.
@equals = ( require 'util' ).isDeepStrictEqual@deep_copy = ( require '../dependencies/rfdc-patched.js' )()@copy_regex = ( require '../dependencies/sindresorhus-clone-regexp.js' ).cloneRegExpSee also
jseq for an in-depth comparison of numerous alternatives
to the present implementation of GUY.samesame.equals().structuredClone() for some
shortcomings of the new JS built-in structuredClone() (besides the insane naming decision).rfdc: Really Fast Deep Clone for the underlying
implementation of GUY.samesame.deep_copy().clone-regexp by Sindre Sorhus for
the code added to rfdc to enable copying of RegExes.GUY.rnd@_shuffle = ( list, ratio, rnd, random_integer ) ->@get_rnd = ( seed = 1, delta = 1 ) ->@get_rnd_int = ( seed = 1, delta = 1 ) ->@get_shuffle = ( seed_0 = 0, seed_1 = 1 ) ->@integer_from_normal_float = ( x, min = 0, max = 2 ) ->@random_integer = ( min = 0, max = 2 ) ->@random_number = ( min = 0, max = 1 ) ->@shuffle = ( list, ratio = 1 ) ->GUY.tempThis submodule needs peer-dependencies, install them with
npm install tmpor
pnpm add tmp
GUY.temp provides context handlers to work with temporary files and directories. It is built on top of
tmp.
GUY.temp.with_file: ( cfg, handler ) ->
GUY.temp.with_directory: ( cfg, handler ) ->
GUY.temp.create_directory: ( cfg ) ->
Note refer to hengist to see how to use these methods until docs are written; the below gives a rough idea:
#-----------------------------------------------------------------------------------------------------------
@GUY_temp_context_handler_file = ( T, done ) ->
GUY = require '../../../apps/guy'
#.........................................................................................................
do =>
path = null
info = GUY.temp.with_file ({ path: mypath, fd, }) ->
path = mypath
T?.ok isa.fs_file mypath
T?.eq info, { files: 1, dirs: 0, }
T?.ok not isa.fs_file path
#.........................................................................................................
return done?()
#-----------------------------------------------------------------------------------------------------------
@GUY_temp_context_handler_directory = ( T, done ) ->
GUY = require '../../../apps/guy'
#.........................................................................................................
do =>
path = null
info = GUY.temp.with_directory ({ path: mypath, }) ->
path = mypath
debug '^34534^', { path, }
T?.ok isa.fs_directory mypath
T?.eq info, { files: 0, dirs: 1, }
T?.ok not isa.fs_directory path
#.........................................................................................................
do =>
path = null
info = GUY.temp.with_directory { prefix: 'whatever-', }, ({ path: mypath, }) ->
path = mypath
debug '^34534^', { path, }
T?.ok ( PATH.basename mypath ).startsWith 'whatever-'
T?.ok isa.fs_directory mypath
T?.eq info, { files: 0, dirs: 1, }
T?.ok not isa.fs_directory path
#.........................................................................................................
return done?()
GUY.temp.create_directory() will create a directory and return an object with two entries, rm and
path. rm is a function that, when called without arguments, will remove the directory whose location is
indicated by path. One way to ensure such a temporary directory will in fact be removed is to use
GUY.process.on_exit(), as in GUY.process.on_exit -> warn "removing #{path}"; rm()
GUY.datetimeThis submodule needs peer-dependencies, install them with
npm install dayjsor
pnpm add dayjs
GUY.datetime provides methods to obtain and convert timestamps.
isots: ISO TimeStamp
srts: Short, Readable TimeStamp
@from_now = ( srts ) ->
@now = ( cfg ) ->
@srts_from_isots = ( isots ) ->
@parse = ( srts ) ->
@format = ( srts, P... ) ->
@isots_from_srts = ( srts ) ->
[–] adopt icql-dba/errors#Dba_error:
class @Dba_error extends Error
constructor: ( ref, message ) ->
super()
@message = "#{ref} (#{@constructor.name}) #{message}"
@ref = ref
return undefined
[–] while test @[ "nowait with async steampipes" ] works in isolation, running the test suite hangs
indefinitely.
[+] see whether
Benchmarks
show that patched version with suitable chunk size performs OK; using patched version to avoid deprecation
warning.n-readlines may be replaced by a simpler, faster implementation as it does
contain some infelicitous loops in
_searchInBuffer that can
probably be replaced by
buffer.indexOf().
Also, there's a similar implementation in
intertext-splitlines.
[–] GUY.fs.walk_lines(): allow to configure; make trimEnd() the default
implement easy way to collect, rediect process.stdout, process.stderr:
original_stderr_write = process.stderr.write.bind process.stderr
collector = []
process.stderr.write = ( x ) ->
echo '^3453^', type_of x
# FS.writeSync output_fd, x
collector.push x
original_stderr_write '^1234^ '
original_stderr_write x
echo "(echo) helo world"
info "(info) helo world"
info "whatever goes on here"
warn CND.reverse "is collected"
for x in collector
process.stdout.write '^collector@4565^' + x
[–] take over tabulation (as in hengist/src/helpers)
[–] could the SQL string annotation / tagged literal function be syntactically extended to allow
simpler interpolation of escaped names? Could we instantiate it with a dictionary of values?
[–] GUY.src.get_first_return_clause_text():
cfg-based to make compatible with call conventions for
GUY.src.parse()fallback argument to decide whether to return value or throw error in case of parsing
failure (same for parse())ReturnStatements are found:
undefinedreturn: argument property of the ReturnStatement nodereturns: BlockStatement (i.e. the function
body) (???)[–] move GUY.src._generate() to public API
[–] what should be the correct output for GUY.src.slug_from_simple_function { function: ( -> ), }?
Currently it is the empty string which is not ideal
[–] use
Reflect.has()
to check for property availability for Strict_owners instead of using instance method; provide as
GUY.props.has()
[–] likewise, use GUY.props.get: ( target, name, fallback = misfit ) -> instead of instance method
[–] consider to move submodule _builtins, test for builtins to Intertype, backport to
Intertype-legacy
[–] consider to make trm.log() write to stdout, err() to stderr
[–] implement trm.write() write to stdout without trailing newline (but formatting like log())
[–] consider to drop trm.pen(), use improved GUY.trm.rpr() instead
[–] fix GUY.props.get '', 'length' (works for sets but not for string)s
[–] consider to re-implement deep_copy() from letsfreezethat using rfdc
[–] remove dependencies as far as possible, make GUY run in browser
LOUPE = require '../deps/loupe.js'
@rpr = rpr = ( x ) => LOUPE.inspect x, { customInspect: false, }
@xrpr = ( x ) -> ( rpr x )[ .. 1024 ]
[–] modify behavior of GUY.props.tree():
take_key(), descend_value(), filter_path()take_key: ( owner, key, value ) ->descend_value: ( owner, key, value ) ->filter_path: ( owner, path ) ->; path will be list of strings w/out sep, single string with itGUY.props.walk_tree()[–] modify behavior of GUY.trm.rpr():
rpr x, cfg or rpr P...node:util.inspect[–] implement method that allows to name a type and give a cfg object, returns cfg for named typed
based on crossmatch()ing defaults for that type with given cfg
[–] GUY.trm.warn(), alert(): collect and re-issue on process exit; may want to throw error or at
least issue non-zero error code when messages beyond (configurable) urgency threshold were issued; this
will allow apps to not bail out prematurely on minor issues and keep messages from getting hidden in
regular messages
[–] turn Strict_owner instances into sealed objects, retaining old behavior in new class
Strict_getter
[–] turn GUY, submodules into Strict_owner instances
[–] move deep freezing, deep sealing from lft to props?
[–] concerning Strict_owner: in
hengist/dev/intertype/_ng.test.coffee
we have found a way to build custom-named functions with strict ownership:
@_demo_type_cfgs_as_funmctions_2 = ->
class Intertype
create_type_cfg: ( cfg ) ->
defaults = { extras: true, collection: false, type: null, }
cfg = { defaults..., cfg..., }
name = cfg.type
R = ( ( x ) -> x ** 2 ).bind @
Object.defineProperty R, 'name', { value: name, }
R[ k ] = v for k, v of cfg
R = new GUY.props.Strict_owner target: R
Object.seal R
# R = GUY.lft.freeze R1 = R # <== doesn't freeze???
Object.freeze R # <== works as expected
return R
types = new Intertype()
urge '^982-1^', f = types.create_type_cfg { type: 'foobar', }
# Object is frozen, sealed, and has a strict `get()`ter:
urge '^982-2^', Object.isFrozen f
urge '^982-3^', Object.isSealed f
try f.collection = true catch error then warn rvr error.message # Cannot assign to read only property 'collection' of function 'function () { [native code] }'
try f.xxx catch error then warn rvr error.message # ^guy.props.Strict_owner@1^ Strict_owner instance does not have property 'xxx'
try f.xxx = 111 catch error then warn rvr error.message # Cannot define property xxx, object is not extensible
info '^982-4^', f.name
info '^982-5^', f 42
return null
This should lead to the following:
GUY.lft.freeze() does not freeze a functionGUY.props.Strict_owner:
sealing (next to freezeing)Intertype or
Dbay instance), mimicking a prototype chain[–] integrate pinned package versions helper, cf ( require 'mixa/lib/check-package-versions' ) require '../pinned-package-versions.json'
[–] documentation for temp
[–] implement line walker for strings, analoguous to GUY.fs.walk_lines():
#.........................................................................................................
walk_lines = ( text ) ->
validate.text text
pattern = /.*?(\n|$)/suy
last_position = text.length - 1
loop
break if pattern.lastIndex > last_position
unless ( match = text.match pattern )?
debug '^3234^', text[ pattern.lastIndex .. ]
break
yield match[ 0 ]
R = walk_lines()
R.reset = -> pattern.lastIndex = 0
return R
#.........................................................................................................
md_lexer = new_toy_md_lexer 'md'
parser = new_toy_parser()
lines = probe.split /\n+/us
#.........................................................................................................
debug '^79-1^'
debug '^79-1^', rpr line for line from walk_lines probe
debug '^79-1^', rpr line for line from walk_lines probe + '\n'
debug '^79-1^', rpr line for line from walk_lines probe + '\n\n'
[–] GUY.fs.walk_lines(), GUY.str.walk_lines(): implement option to add custom suffix to each line
such as (most frequently) \n to help in line-wise lexing
[–] implement option to track global position in GUY.*.walk_lines(), including skipped newline
characters
[–] possible / useful to implement step / walk / run API for fs.walk_lines(),
str.walk_lines()?
[–] all modules that have 3rd-party dependencies should go into separate packages so it becomes
possible to add a minimal version of guy to a project without incurring any transitive dependencies.
The respective code should go into separate projects that depend on guy (guy-src, guy-temp,
guy-watch, guy-datetime)
src (acorn, acorn-loose, acorn-walk, astring)temp (tmp)watch (chokidar)datetime (dayjs)intertype-legacy to be replaced by a few (?) custom helpers (?) (or by an updated version?
currently intertype depends only on webguy)letsfreezethat is only used once in main to represent submodule lft, therefore can be
dispensed withacornacorn, upon parse error acorn-looseacorn-looseparse(): use fallback argument to decide whether to return value or throw error in case of
parsing failureGUY.props.has()
Reflect.has() catching TypeError: Reflect.has called on non-object, and
Object.getPrototypeOf(), orx[ key ], discarding value and catching errors from strict owners, null
and undefined.length or size) is used
structuredClone; benchmarksGUY.props.has_keys() -> GUY.props.has_any_keys()temp with
tmp as the former has global state (see
node-temp#98)temp context handlers work with async functionsafter, as in
after = ( dts, f ) => new Promise ( resolve ) -> setTimeout ( -> resolve f() ), dts * 1000\n\r, \rFAQs
npm dependencies checker
The npm package guy receives a total of 10 weekly downloads. As such, guy popularity was classified as not popular.
We found that guy demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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