@c This file is part of the GNU gettext manual.
@c Copyright (C) 1995-2020 Free Software Foundation, Inc.
@c See the file gettext.texi for copying conditions.

@node Tcl
@subsection Tcl - Tk's scripting language
@cindex Tcl
@cindex Tk's scripting language

@table @asis
@item RPMs
tcl

@item Ubuntu packages
tcl

@item File extension
@code{tcl}

@item String syntax
@code{"abc"}

@item gettext shorthand
@code{[_ "abc"]}

@item gettext/ngettext functions
@code{::msgcat::mc}

@item textdomain
---

@item bindtextdomain
---, use @code{::msgcat::mcload} instead

@item setlocale
automatic, uses LANG, but ignores LC_MESSAGES and LC_ALL

@item Prerequisite
@code{package require msgcat}
@*@code{proc _ @{s@} @{return [::msgcat::mc $s]@}}

@item Use or emulate GNU gettext
---, uses a Tcl specific message catalog format

@item Extractor
@code{xgettext -k_}

@item Formatting with positions
@code{format "%2\$d %1\$d"}

@item Portability
fully portable

@item po-mode marking
---
@end table

Two examples are available in the @file{examples} directory:
@code{hello-tcl}, @code{hello-tcl-tk}.

Before marking strings as internationalizable, substitutions of variables
into the string need to be converted to @code{format} applications.  For
example, @code{"file $filename not found"} becomes
@code{[format "file %s not found" $filename]}.
Only after this is done, can the strings be marked and extracted.
After marking, this example becomes
@code{[format [_ "file %s not found"] $filename]} or
@code{[msgcat::mc "file %s not found" $filename]}.  Note that the
@code{msgcat::mc} function implicitly calls @code{format} when more than one
argument is given.