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The source code for Tcl is managed by fossil. Tcl developers coordinate all
changes to the Tcl source code at
> [Tcl Source Code](https://core.tcl-lang.org/tcl/timeline)
Release Tcl 8.7b1 arises from the check-in with tag core-8.7-b1.
Release Tcl 8.7b1 arises from the check-in with tag core-8-7-b1 (not released yet).
Highlighted differences between Tcl 8.7 and Tcl 8.6 are summarized below,
with focus on changes important to programmers using the Tcl library and
writing Tcl scripts.
## Internationalization of text
- Full Unicode range of codepoints
- New encodings: utf-16/utf-32/ucs-2(le|be), CESU-8, etc.
- `encoding` options -profile, -failindex manage encoding of I/O.
- New encodings: `utf-16`/`utf-32`/`ucs-2`(`le`|`be`), `CESU-8`, etc.
- `encoding` options `-profile`, `-failindex` manage encoding of I/O.
- `msgcat` supports custom locale search list
- `source` defaults to -encoding utf-8
- `source` defaults to `-encoding utf-8`
## Zip filesystems and attached archives.
- Packaging of the Tcl script library with the Tcl binary library,
meaning that the `TCL_LIBRARY` environment variable is usually not required.
- Packaging of an application into a virtual filesystem is now a supported
core Tcl feature.
## Unix notifiers available using epoll() or kqueue()
- relieves limits on file descriptors imposed by legacy select()
## Unix notifiers available using `epoll()` or `kqueue()`
- This relieves limits on file descriptors imposed by legacy `select()` and fixes a performance bottleneck.
# Incompatibilities
## Notable incompatibilities
- No --disable-threads build option. Always thread-enabled.
- Windows platform needs Windows 7 or Windows Server 2008 R2 or later
- No `--disable-threads` build option. Always thread-enabled.
# New Features
## New commands
- `array default`, `array for`
- `chan isbinary`
- `coroinject`, `coroprobe`
- `clock add weekdays`
- `dict getwithdefault`
- `file tempdir`, `file home`, `file tildeexpand`
- `info commandtype`
- `ledit`
- `lpop`
- `lremove`
- `lseq`
- `package files`
- `string insert`, `string is dict`
- `tcl::process`
- `*::build-info`
- `readFile`, `writeFile`, `foreachLine`
- `array default` — Specify default values for arrays (note that this alters the behaviour of `append`, `incr`, `lappend`).
- `array for` — Cheap iteration over an array's contents.
- `chan isbinary` — Test if a channel is configured to work with binary data.
- `coroinject`, `coroprobe` — Interact with paused coroutines.
- `clock add weekdays` — Clock arithmetic with week days.
- `dict getwithdefault` — Define a fallback value to use when `dict get` would otherwise fail.
- `file home` — Get the user home directory.
- `file tempdir` — Create a temporary directory.
- `file tildeexpand` — Expand a file path containing a `~`.
- `info commandtype` — Introspection for the kinds of commands.
- `ledit` — Equivalent to `lreplace` but on a list in a variable.
- `lpop` — Remove an item from a list in a variable.
- `lremove` — Remove a sublist from a list in a variable.
- `lseq` — Generate a list of numbers in a sequence.
- `package files` — Describe the contents of a package.
- `string insert` — Insert a string as a substring of another string.
- `string is dict` — Test whether a string is a dictionary.
- `tcl::process` — Commands for working with subprocesses.
- `*::build-info` — Obtain information about the build of Tcl.
- `readFile`, `writeFile`, `foreachLine` — Simple procedures for basic working with files.
- `tcl::idna::*` — Commands for working with encoded DNS names.
## New command options
- `chan configure ... -inputmode ...` — Support for raw terminal input and reading passwords.
- `clock scan ... -validate ...`
- `info loaded ... ?prefix?`
- `lsearch ... -stride ...`
- `regsub ... -command ...`
- `lsearch ... -stride ...` — Search a list by groups of items.
- `regsub ... -command ...` — Generate the replacement for a regular expression by calling a command.
- `socket ... -nodelay ... -keepalive ...`
- `vwait` controlled by several new options
- `expr` string comparators `lt`, `gt`, `le`, `ge`
- `expr` supports comments inside expressions
## Numbers
- 0dNNNN format to compel decimal interpretation.
- NN_NNN_NNN, underscores in numbers for optional readability
- Functions: isinf() isnan() isnormal() issubnormal() isunordered()
- `fpclassify`
- Function int() no longer truncates to word size
- <code>0d<i>NNNN</i></code> format to compel decimal interpretation.
- <code>NN_NNN_NNN</code>, underscores in numbers for optional readability
- Functions: `isinf()`, `isnan()`, `isnormal()`, `issubnormal()`, `isunordered()`
- Command: `fpclassify`
- Function `int()` no longer truncates to word size
## tcl::oo facilities
- private variable and methods
## TclOO facilities
- private variables and methods
- class variables and methods
- abstract and singleton classes
- configurable properties
- `method -export`, `method -unexport`
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