Updated 2017-10-02 18:11:06 by pooryorick

ycl, short for Yorick's Computing tooLkit, is PYK's collection of miscellaneous procedures and programs.

Installation  edit

To download ycl:
fossil clone http://chiselapp.com/user/pooryorick/repository/ycl ycl.fossil

Then, open the fossil and add /path/to/opened/fossil/packages to $auto_path

There is also a helper script, .../ycl/bin/yclrun, which will automatically adjust $auto_path, and can be used as wrapper:
tclsh /path/to/opened/fossil/packages/ycl/bin/yclrun myscript.tcl

There is another helper script for an interactive shell:
tclsh /path/to/opened/fossil/packages/ycl/bin/yclsh

Zipguy 2013-11-24: How about if you put all those files into a folder structure? Even one folder, named 'ycl', or 'app-ycl' would work good. Then you could either zip them (or you could have gz'ed them), or SDX them (into a starkit) which would make it a lot easier to download them? There are way too many files for me to chase, individually, even though they look quite interesting. Probably a version would be good too, so you could check it, and see if you've already downloaded the latest version.

pyk: you can get this by logging into the repository as anonymous, and then choosing to download the zip or tarball for the commit you're interested in.

Usage  edit

The documentation appears in the source code immediately prior to each function declaration. It is in a text format which is intended to be reasonably intuitive even without much knowledge of Tcl.

Most packages have test suites (look for files ending in .test), which provide examples.

ycl/bin/ycl  edit

The script ycl/bin/ycl can be used to call a command in ycl from a shell.


ycl/bin/ycl cmd package command ?args?

command is a command available in package


From an sh shell:
$ tclsh /cygdrive/c/Users/yorick/Documents/ycl/src/packages/ycl/bin/ycl cmd 'math rand' randprint_256
BUV9z#[email protected]^ytLk1LrTKRp35tbqN^LgqkH7Z6

Contents  edit


A threaded non-blocking channel multiplexer that has various modes. It can act as a buffer for a single channel, which is the right tool for capturing stderr from an open or exec pipeline. It can act as a multiplexer sending the contents of the channel to multiple recipeient channels. It can act as a sink to just drain a channel.
A reflected channel that wraps another channel, translating its contents from HTTP chunked format. Written as a reflected channel instead of a channel transform so that the wrapped channel can persist after the chunked wrapper is closed. This feature is useful for persistent HTTP connections.
A skeleton reflected channel that wraps another channel.

chan clib

package require {ycl chan clib}
::critcl::api import ycl_chan_clib 0.1

Provides the following C functions:
filter(Tcl_Interp *interp ,Tcl_Channel inchan ,Tcl_Channel outchan ,(process)(Tcl_Interp *interp ,Tcl_UniChar *uchar ,Tcl_DString *output))
Filters data as it passes from inchan to outchan. process recieves one character and modifies output , which is then written to outchan.


ycl comm http
An http client that makes use of coroutines and reflected channels.


Deprecated in favor of ycl shelf
package require {ycl context}
namespace import [yclprefix]::context::context

proc fly {ns args} {
    puts  "$ns is flying!"

proc nofly {ns args} {
    puts "$ns can't fly!"

context bird
bird method fly
bird fly

bird derive eagle
eagle fly

bird derive emu
emu method fly nofly
emu fly

#remove emu's restriction
set emumethods [namespace ensemble configure emu -map]
set emumethods [dict remove $emumethods fly]
namespace ensemble configure emu -map $emumethods

emu fly


A distillation of the ycl coro relay system into three commands: wait, reply, and async. This provides all the functionality of Javascript promises but without all the extra syntax.
An event loop for coroutines. Tries to play nice with Tcl's event loop. This system was created to avoid the performance penalty of using Tcl's event loop as a queue for communication between coroutines.
A small but complete system that allows cooperating coroutines to make and deliver orders amongst themselves.


An entity-attribute-value system built on sqlite, featuring a Tcl-ish interface and query capabilities, and traces for maintaining data constraints and reacting in other ways to record updates.


creates and manages minions of threaded asynchronous pipelined backpressure-mediated compute stations.


package require {ycl dir}
namespace import [yclprefix]::dir
Copy a file or directory into an archive location, faithfully duplicating any symbolic links, recursively, in the path of the file. Does not copy the contents of a directory, just the directory node itself, which may be a symbolic link. In order to accomodate arbitrary symbolic links in the path of the file or directory, It is placed in the archive at the same absolute location, with the archive directory as the root.
find duplicate files
remove duplicate files
iterate over items in a directory tree.
for item in [dir iter /my/dir] {
    #do stuff


A "daemon" coroutine that collects entropy when the system is idle.


invoke a child program and asynchronously handle stdio, stderr, and exit code. See example at [open].


Very similar in spirit to Generator. Can be used with [for ... in]
package require {ycl iter}

A set of iterators
iterate over a file, by line or arbitrary function
iterate over the characters in a string


converts the words of a value in sh syntax to a Tcl list.


package require {ycl iter for}
for ... in
a convenient loop construct for working with iterators


See knit.


variable fruits {apple banana orange pear kiwi}
proc is_fruit item {
    variable fruits
    return [expr {$item in $fruits}]

The functions, 'all, any, are, and which also support an in $list pattern.
true if all items in a list pass the specified test
all {banana cookie} [list apply [list x {variable fruits; expr {$x in $fruits}} [namespace current]]]
all {banana cookie} in $fruits
# -> 0
true if any items in a list pass the specified test
any {banana cookie} [list apply [list x {variable fruits; expr {$x in $fruits}} [namespace current]]]
any {banana cookie} in $fruits
# -> 1
a list containing true/false answers indicating whether items in a list pass the specified test
are {banana cookie} [list apply [list x {variable fruits; expr {$x in $fruits}} [namespace current]]]
are {banana cookie} in $fruits
# -> {1 0}
Remove common whitespace from list items.
filter list mask
Filter items from list using mask, which is a list of boolean values.
Extract elements from a list by combinations of index, range, and step.
See scripted list.
a list of items from a list that pass the specified test
which {banana cookie} [list apply [list x {variable fruits; expr {$x in $fruits}} [namespace current]]]
which {banana cookie} in $fruits
# -> banana


A close-to-drop-in replacement for tcllib's matrix, but with better performance characteristics since it's more careful about avoiding duplication of data during operation.


Randomly produces a 1 or 0. The output is intended to have the same high entropy as as true random numbers and to be suitable for cryptographic use. This command is analagous to /dev/random.
Cryptogphic random number generator using a seed produced by flip. Analagous to /dev/urandom.
A cryptographically-strong alternative to the built-in rand() function.


package require {ycl ns}
Copy all commands in a namespace to another namespace, refusing to overwrite any existing commands, and ignoring commands named in in $args. In contrast to oo::copy <cloned>, if a command is both an alias and a procedure, it is treated as an alias.
ensemble duplicate
Copy a namespace ensemble, and if necessary, the namespace that's backing it, along with any child namespaces, recursively. Also replaces in the ensemble map occurrences of the old ensemble name with the new ensemble name. dupensemble can be used as the simplese form of object system, where each namespace hierarchy is treated as an object. Tcl's copy-on-write semantics make this system much more efficient than one would expect at first blush. dupensemble is used by ycl::shelf
ensemble subcommands
List the currently-available subcommands of a namespace ensemble.
duplicates all variables in a namespace to another namespace


tcl step
A drop-in replacement for proc that provides a pre-evaluation hook and an error handling hook for each command in the script.


Together with proc::methods, proc::upmethods, and var::upmethods, compromises an object system much like ycl::context. Its method calling style provides for uplevel 1 to be the object's namespace, and uplevel 2 to be the caller of the method. This turned out to be a little clunky, and ycl shelf is now preferred to this system.
#! /bin/env tclsh

package require ycl::ns
namespace import ycl::ns::object
package require ycl::proc

namespace import ycl::proc::*method

upmethod die {} {} {} {
    puts "$_ dies."

object chessman import {name die}
chessman $ name unknown

namespace eval chessman {
    upmethod move {} {} {} {
        puts "$_ doesn't know how to move!"

object pawn
pawn parent chessman
namespace eval pawn {
    upmethod move {} {} {} {
        puts "$_ is plodding forward"

object knight 
knight parent chessman
namespace eval knight {
    upmethod move {} {} {} {
        puts "$_ gallops forward and to the side"

object amazon
namespace eval amazon {
    upmethod move {args} {} {} {
        dict with args {}
        if {$as ni {knight queen}} {
            puts "$_ can not move as a $as"
        } else {
            puts "$_ is moving as a $as"

puts "chessman name is: [chessman $ name]"
# -> unknown

chessman move
# -> ::chessman doesn't know how to move! 

object pawn1 
pawn1 parent pawn
pawn1 move 
# -> ::pawn1 is plodding forward

puts "pawn1 name is: [pawn1 $ name]"
# -> unknown

pawn1 $ name {white a}
puts "pawn1 name is now: [pawn1 $ name]"
# -> white a

object knight1
knight1 parent knight
knight1 move 
# -> ::knight1 gallops forward and to the side 

object knight3
knight3 parent knight2
knight3 parent amazon
knight3 move as queen
knight3 move as bishop


like package vcompare, but accepts just about anything as a version string.


tcl commands
Split a Tcl script into its components. This is scriptsplit
tcl iter
Uses ycl coro relay to deliver the comands in a script read from a channel.
tcl words
Split a Tcl command into its components. This is cmdSplit.
tcl wordparts
Split a logical word from a Tcl command into its literal, escape-sequence, and substitution components. This is wordparts.
tcl stream
Incrementally parse a Tcl script from a channel.
An xml parser based on ycl parser graph. -relax true enables a forgiving mode when trying to make it through an document.
xml util validCharExpr varname
Returns an expression that evaluates to true if the character in $varname is a valid XML character, and false otherwise.
xml util encodeInvalidChars inchanname outchanname
A filter between channels that converts characters that are invalid in XML to their XML character representations. Accelerated with Critcl when it's available. Uses ycl chan clib filter.


package require {ycl parser graph}
A framework for extracting graphs from data. -transient false instructs the parser to leave behind a hierarchy of namespaces representing the graph, and commands like children, path, and traverse provide an interface to the graph. This system facilitates the creation of parsers that ignore text outside the target syntax of a given parser.


package require ycl::dir
namespace import [yclprefix]::dir
functional documentation for procedures. Somewhat like tepam, with additional aspects of literate programming. Examples include ycl::dir::iter, and ycl::ns::object
an analogue of interp alias that avoids the potential negative performance impact. In contrast to interp alias, extra arguments can not be tacked on to the alias.



See ycl shelf


package require {ycl string}
Like the Unix cmp command, compares two strings and returns the index at which they differ, or -1 if they are identical. Uses a bisect strategy for performance, and for memory efficiency does not extract substrings. Short-circuits when a difference is found.
same as string match, but return -1 if $string doesn't match, and the index of the last char of the shortest match if it does
remove common newline-whitespace
split (partition) a string into substrings using any combination of string, match, or regular expressions, returning both the substrings and the delimiters.
Provides a macro syntax to expand substrings within a string by iteratively replacing a listed nested in the substring itself with items from the list. The idea is to generate code while keeping the original source code legible.
Provides a concise syntax for embedding and expanding templates in text, the primary target being Tcl scripts. Based on ycl parser graph
Cut down the verbosity of string map by using the same name to obtain a value from a local variable and to map that value into the string, providing default delimiters, and by automatically quoting values with list. Example:
set a 5
set b 7
set expr {[set a]}
eval [template a b # c {
        set a @[email protected]
        set b @[email protected]
        expr {$a + $b + @[email protected]}


Nested heterogeneous structures. Example: nxs get $mystruct l {0 3 1} d {name Bob friends} l 5. To set a nested vale: nxs set mystruct l {0 3 1} d {name Bob friends} = l end Jane. Extend the functions to additional types of nested structures by adding keys to nxs::get, nxs::set, and nxs::unset. To specialize the library, use ycl ns dupensemble to create a copy of it.


Like switch, but each pattern is a list of patterns to match against the item in string at the corresponding position. All switch options are supported.


Formats a string as a printable Tcl string. Non-printable characters are transformed into their most simple backslash-escaped representation, and backslash is also escaped.


Assimilated from Bryan Okley's combobox.


A simple presentation system in Tk.

[anonymous] - 2016-08-26 01:25:05

What is the license on your ycl toolkit? It's not totally clear and there are some GPL'd items hidden in it.

PYK 2016-08-30: Contributors license their contributions independently. As for my contributions, I'm currently handling license requests on a case-by-case basis.