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|
% \iffalse meta-comment
%
%% File: l3sys.dtx
%
% Copyright (C) 2015-2019 The LaTeX3 Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version. The latest version
% of this license is in the file
%
% https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3kernel bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
% https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3sys} package: System/runtime functions^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2019-10-24}
%
% \maketitle
%
% \begin{documentation}
%
% \section{The name of the job}
%
% \begin{variable}[added = 2015-09-19]{\c_sys_jobname_str}
% Constant that gets the \enquote{job name} assigned when \TeX{} starts.
% \begin{texnote}
% This copies the contents of the primitive \tn{jobname}. It is a constant
% that is set by \TeX{} and should not be overwritten by the package.
% \end{texnote}
% \end{variable}
%
% \section{Date and time}
%
% \begin{variable}[added = 2015-09-22]
% {
% \c_sys_minute_int,
% \c_sys_hour_int,
% \c_sys_day_int,
% \c_sys_month_int,
% \c_sys_year_int,
% }
% The date and time at which the current job was started: these are
% all reported as integers.
% \begin{texnote}
% Whilst the underlying primitives can be altered by the user, this
% interface to the time and date is intended to be the \enquote{real}
% values.
% \end{texnote}
% \end{variable}
%
% \section{Engine}
%
% \begin{function}[added = 2015-09-07, EXP, pTF]
% {
% \sys_if_engine_luatex:,
% \sys_if_engine_pdftex:,
% \sys_if_engine_ptex: ,
% \sys_if_engine_uptex: ,
% \sys_if_engine_xetex:
% }
% \begin{syntax}
% \cs{sys_if_engine_pdftex:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Conditionals which allow engine-specific code to be used. The names
% follow naturally from those of the engine binaries: note that the
% |(u)ptex| tests are for \epTeX{} and \eupTeX{} as \pkg{expl3} requires
% the \eTeX{} extensions. Each conditional is true for
% \emph{exactly one} supported engine. In particular,
% |\sys_if_engine_ptex_p:| is true for \epTeX{} but false for \eupTeX{}.
% \end{function}
%
% \begin{variable}[added = 2015-09-19]{\c_sys_engine_str}
% The current engine given as a lower case string: one of
% |luatex|, |pdftex|, |ptex|, |uptex| or |xetex|.
% \end{variable}
%
% \section{Output format}
%
% \begin{function}[added = 2015-09-19, EXP, pTF]
% {
% \sys_if_output_dvi:,
% \sys_if_output_pdf:
% }
% \begin{syntax}
% \cs{sys_if_output_dvi:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Conditionals which give the current output mode the \TeX{} run is
% operating in. This is always one of two outcomes, DVI mode or
% PDF mode. The two sets of conditionals are thus complementary and
% are both provided to allow the programmer to emphasise the most
% appropriate case.
% \end{function}
%
% \begin{variable}[added = 2015-09-19]{\c_sys_output_str}
% The current output mode given as a lower case string: one of
% |dvi| or |pdf|.
% \end{variable}
%
% \section{Platform}
%
% \begin{function}[added = 2018-07-27, EXP, pTF]
% {
% \sys_if_platform_unix:,
% \sys_if_platform_windows:
% }
% \begin{syntax}
% \cs{sys_if_platform_unix:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Conditionals which allow platform-specific code to be used. The names
% follow the \Lua{} |os.type()| function, \emph{i.e.}~all Unix-like systems
% are |unix| (including Linux and MacOS).
% \end{function}
%
% \begin{variable}[added = 2018-07-27]{\c_sys_platform_str}
% The current platform given as a lower case string: one of
% |unix|, |windows| or |unknown|.
% \end{variable}
%
% \section{Random numbers}
%
% \begin{function}[added = 2017-05-27, EXP]{\sys_rand_seed:}
% \begin{syntax}
% \cs{sys_rand_seed:}
% \end{syntax}
% Expands to the current value of the engine's random seed, a
% non-negative integer. In engines without random number support this
% expands to $0$.
% \end{function}
%
% \begin{function}[added = 2017-05-27]{\sys_gset_rand_seed:n}
% \begin{syntax}
% \cs{sys_gset_rand_seed:n} \Arg{intexpr}
% \end{syntax}
% Globally sets the seed for the engine's pseudo-random number
% generator to the \meta{integer expression}. This random seed
% affects all \cs[no-index]{\ldots{}_rand} functions (such as
% \cs{int_rand:nn} or \cs{clist_rand_item:n}) as well as other
% packages relying on the engine's random number generator. In
% engines without random number support this produces an error.
% \begin{texnote}
% While a $32$-bit (signed) integer can be given as a seed, only the
% absolute value is used and any number beyond $2^{28}$ is divided
% by an appropriate power of~$2$. We recommend using an integer in
% $[0,2^{28}-1]$.
% \end{texnote}
% \end{function}
%
% \section{Access to the shell}
%
% \begin{function}[noTF, added = 2019-09-20]
% {\sys_get_shell:nnN}
% \begin{syntax}
% \cs{sys_get_shell:nnN} \Arg{shell~command} \Arg{setup} \meta{tl~var}
% \cs{sys_get_shell:nnNTF} \Arg{shell~command} \Arg{setup} \meta{tl~var} \Arg{true code} \Arg{false code}
% \end{syntax}
% Defines \meta{tl} to the text returned by the \meta{shell command}.
% The \meta{shell command} is converted to a string using
% \cs{tl_to_str:n}. Category codes may need to be set appropriately
% via the \meta{setup} argument, which is run just before running the
% \meta{shell command} (in a group).
% If shell escape is disabled, the \meta{tl~var} will be set to
% \cs{q_no_value} in the non-branching version.
% Note that quote characters (|"|) \emph{cannot} be used inside the
% \meta{shell command}. The \cs{sys_get_shell:nnNTF} conditional
% returns \texttt{true} if the shell is available and no quote is
% detected, and \texttt{false} otherwise.
% \end{function}
%
% \begin{variable}[added = 2017-05-27]{\c_sys_shell_escape_int}
% This variable exposes the internal triple of the shell escape
% status. The possible values are
% \begin{description}
% \item[0] Shell escape is disabled
% \item[1] Unrestricted shell escape is enabled
% \item[2] Restricted shell escape is enabled
% \end{description}
% \end{variable}
%
% \begin{function}[added = 2017-05-27, EXP, pTF]{\sys_if_shell:}
% \begin{syntax}
% \cs{sys_if_shell_p:}
% \cs{sys_if_shell:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Performs a check for whether shell escape is enabled. This
% returns true if either of restricted or unrestricted shell escape
% is enabled.
% \end{function}
%
% \begin{function}[added = 2017-05-27, EXP, pTF]{\sys_if_shell_unrestricted:}
% \begin{syntax}
% \cs{sys_if_shell_unrestricted_p:}
% \cs{sys_if_shell_unrestricted:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Performs a check for whether \emph{unrestricted} shell escape is
% enabled.
% \end{function}
%
% \begin{function}[added = 2017-05-27, EXP, pTF]{\sys_if_shell_restricted:}
% \begin{syntax}
% \cs{sys_if_shell_restricted_p:}
% \cs{sys_if_shell_restricted:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Performs a check for whether \emph{restricted} shell escape is
% enabled. This returns false if unrestricted shell escape is
% enabled. Unrestricted shell escape is not considered a superset
% of restricted shell escape in this case. To find whether any
% shell escape is enabled use \cs{sys_if_shell:}.
% \end{function}
%
% \begin{function}[added = 2017-05-27]{\sys_shell_now:n, \sys_shell_now:x}
% \begin{syntax}
% \cs{sys_shell_now:n} \Arg{tokens}
% \end{syntax}
% Execute \meta{tokens} through shell escape immediately.
% \end{function}
%
% \begin{function}[added = 2017-05-27]{\sys_shell_shipout:n, \sys_shell_shipout:x}
% \begin{syntax}
% \cs{sys_shell_shipout:n} \Arg{tokens}
% \end{syntax}
% Execute \meta{tokens} through shell escape at shipout.
% \end{function}
%
% \subsection{Loading configuration data}
%
% \begin{function}[added = 2019-09-12]{\sys_load_backend:n}
% \begin{syntax}
% \cs{sys_load_backend:n} \Arg{backend}
% \end{syntax}
% Loads the additional configuration file needed for backend support.
% If the \meta{backend} is empty, the standard backend for the engine in
% use will be loaded. This command may only be used once.
% \end{function}
%
% \begin{variable}{\c_sys_backend_str}
% Set to the name of the backend in use by \cs{sys_load_backend:n} when
% issued.
% \end{variable}
%
% \begin{function}[added = 2019-09-12]{\sys_load_debug:, \sys_load_deprecation:}
% \begin{syntax}
% \cs{sys_load_debug:}
% \cs{sys_load_deprecation:}
% \end{syntax}
% Load the additional configuration files for debugging support and rolling
% back deprecations, respectively.
% \end{function}
%
% \subsection{Final settins}
%
% \begin{function}[added = 2019-10-06]{\sys_finalise:}
% \begin{syntax}
% \cs{sys_finalise:}
% \end{syntax}
% Finalises all system-dependent functionality: required before loading
% a backend.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3sys} implementation}
%
% \begin{macrocode}
%<@@=sys>
% \end{macrocode}
%
% \subsection{Kernel code}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \subsubsection{Detecting the engine}
%
% \begin{macro}{\@@_const:nn}
% Set the |T|, |F|, |TF|, |p| forms of |#1| to be constants equal to
% the result of evaluating the boolean expression~|#2|.
% \begin{macrocode}
\cs_new_protected:Npn \@@_const:nn #1#2
{
\bool_if:nTF {#2}
{
\cs_new_eq:cN { #1 :T } \use:n
\cs_new_eq:cN { #1 :F } \use_none:n
\cs_new_eq:cN { #1 :TF } \use_i:nn
\cs_new_eq:cN { #1 _p: } \c_true_bool
}
{
\cs_new_eq:cN { #1 :T } \use_none:n
\cs_new_eq:cN { #1 :F } \use:n
\cs_new_eq:cN { #1 :TF } \use_ii:nn
\cs_new_eq:cN { #1 _p: } \c_false_bool
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[pTF, EXP]
% {
% \sys_if_engine_luatex:,
% \sys_if_engine_pdftex:,
% \sys_if_engine_ptex:,
% \sys_if_engine_uptex:,
% \sys_if_engine_xetex:
% }
% \begin{variable}{\c_sys_engine_str}
% Set up the engine tests on the basis exactly one test should be true.
% Mainly a case of looking for the appropriate marker primitive. For
% \upTeX{}, there is a complexity in that setting |-kanji-internal=sjis|
% or |-kanji-internal=euc| effective makes it more like \pTeX{}. In those
% cases we therefore report \pTeX{} rather than \upTeX{}.
% \begin{macrocode}
\str_const:Nx \c_sys_engine_str
{
\cs_if_exist:NT \tex_luatexversion:D { luatex }
\cs_if_exist:NT \tex_pdftexversion:D { pdftex }
\cs_if_exist:NT \tex_kanjiskip:D
{
\bool_lazy_and:nnTF
{ \cs_if_exist_p:N \tex_disablecjktoken:D }
{ \int_compare_p:nNn { \tex_jis:D "2121 } = { "3000 } }
{ uptex }
{ ptex }
}
\cs_if_exist:NT \tex_XeTeXversion:D { xetex }
}
\tl_map_inline:nn { { luatex } { pdftex } { ptex } { uptex } { xetex } }
{
\@@_const:nn { sys_if_engine_ #1 }
{ \str_if_eq_p:Vn \c_sys_engine_str {#1} }
}
% \end{macrocode}
% \end{variable}
% \end{macro}
%
% \subsubsection{Randomness}
%
% This candidate function is placed there because
% \cs{sys_if_rand_exist:TF} is used in \pkg{l3fp-rand}.
%
% \begin{macro}[EXP, pTF]{\sys_if_rand_exist:}
% Currently, randomness exists under \pdfTeX{}, \LuaTeX{}, \pTeX{} and \upTeX{}.
% \begin{macrocode}
\@@_const:nn { sys_if_rand_exist }
{ \cs_if_exist_p:N \tex_uniformdeviate:D }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Platform}
%
% \begin{macro}[pTF]{\sys_if_platform_unix:, \sys_if_platform_windows:}
% \begin{variable}{\c_sys_platform_str}
% Setting these up requires the file module (file lookup), so is actually
% implemented there.
% \end{variable}
% \end{macro}
%
% \subsubsection{Configurations}
%
% \begin{macro}{\sys_load_backend:n}
% \begin{macro}{\@@_load_backend_check:N}
% \begin{variable}{\c_sys_backend_str}
% Loading the backend code is pretty simply: check that the backend is valid,
% then load it up.
% \begin{macrocode}
\cs_new_protected:Npn \sys_load_backend:n #1
{
\sys_finalise:
\str_if_exist:NTF \c_sys_backend_str
{ \__kernel_msg_error:nn { sys } { backend-set } }
{
\tl_if_blank:nF {#1}
{ \tl_set:Nn \g_@@_backend_tl {#1} }
\@@_load_backend_check:N \g_@@_backend_tl
\str_const:Nx \c_sys_backend_str { \g_@@_backend_tl }
\__kernel_sys_configuration_load:n
{ l3backend- \c_sys_backend_str }
}
}
\cs_new_protected:Npn \@@_load_backend_check:N #1
{
\sys_if_engine_xetex:TF
{
\str_if_eq:VnF #1 { xdvipdfmx }
{
\__kernel_msg_error:nnxx { sys } { wrong-backend }
#1 { xdvipdfmx }
\tl_gset:Nn #1 { xdvipdfmx }
}
}
{
\sys_if_output_pdf:TF
{
\str_if_eq:VnF #1 { pdfmode }
{
\__kernel_msg_error:nnxx { sys } { wrong-backend }
#1 { pdfmode }
\tl_gset:Nn #1 { pdfmode }
}
}
{
\str_case:VnF #1
{
{ dvipdfmx } { }
{ dvips } { }
{ dvisvgm } { }
}
{
\__kernel_msg_error:nnxx { sys } { wrong-backend }
#1 { dvips }
\tl_gset:Nn #1 { dvips }
}
}
}
}
% \end{macrocode}
% \end{variable}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\g_@@_debug_bool, \g_@@_deprecation_bool}
% \begin{macrocode}
\bool_new:N \g_@@_debug_bool
\bool_new:N \g_@@_deprecation_bool
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\sys_load_debug:, \sys_load_deprecation:}
% Simple.
% \begin{macrocode}
\cs_new_protected:Npn \sys_load_debug:
{
\bool_if:NF \g_@@_debug_bool
{ \__kernel_sys_configuration_load:n { l3debug } }
\bool_gset_true:N \g_@@_debug_bool
}
\cs_new_protected:Npn \sys_load_deprecation:
{
\bool_if:NF \g_@@_deprecation_bool
{ \__kernel_sys_configuration_load:n { l3deprecation } }
\bool_gset_true:N \g_@@_deprecation_bool
}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Access to the shell}
%
% \begin{variable}{\l_@@_internal_tl}
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\c_@@_marker_tl}
% The same idea as the marker for rescanning token lists.
% \begin{macrocode}
\tl_const:Nx \c_@@_marker_tl { : \token_to_str:N : }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[TF]{\sys_get_shell:nnN}
% \begin{macro}{\sys_get_shell:nnN,\@@_get:nnN,\@@_get_do:Nw}
% Setting using a shell is at this level just a slightly specialised file
% operation, with an additional check for quotes, as these are not supported.
% \begin{macrocode}
\cs_new_protected:Npn \sys_get_shell:nnN #1#2#3
{
\sys_get_shell:nnNF {#1} {#2} #3
{ \tl_set:Nn #3 { \q_no_value } }
}
\prg_new_protected_conditional:Npnn \sys_get_shell:nnN #1#2#3 { T , F , TF }
{
\sys_if_shell:TF
{ \exp_args:No \@@_get:nnN { \tl_to_str:n {#1} } {#2} #3 }
{ \prg_return_false: }
}
\cs_new_protected:Npn \@@_get:nnN #1#2#3
{
\tl_if_in:nnTF {#1} { " }
{
\__kernel_msg_error:nnx
{ kernel } { quote-in-shell } {#1}
\prg_return_false:
}
{
\group_begin:
\if_false: { \fi:
\int_set_eq:NN \tex_tracingnesting:D \c_zero_int
\exp_args:No \tex_everyeof:D { \c_@@_marker_tl }
#2 \scan_stop:
\exp_after:wN \@@_get_do:Nw
\exp_after:wN #3
\exp_after:wN \prg_do_nothing:
\tex_input:D | "#1" \scan_stop:
\if_false: } \fi:
\prg_return_true:
}
}
\exp_args:Nno \use:nn
{ \cs_new_protected:Npn \@@_get_do:Nw #1#2 }
{ \c_@@_marker_tl }
{
\group_end:
\tl_set:No #1 {#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\c_@@_shell_stream_int}
% This is not needed for \LuaTeX{}: shell escape there isn't done using
% a \TeX{} interface.
% \begin{macrocode}
\sys_if_engine_luatex:F
{ \int_const:Nn \c_@@_shell_stream_int { 18 } }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\sys_shell_now:n}
% Execute commands through shell escape immediately.
% \begin{macrocode}
\sys_if_engine_luatex:TF
{
\cs_new_protected:Npn \sys_shell_now:n #1
{
\lua_now:e
{ l3kernel.shellescape(" \lua_escape:e { \tl_to_str:n {#1} } ") }
}
}
{
\cs_new_protected:Npn \sys_shell_now:n #1
{ \iow_now:Nn \c_@@_shell_stream_int {#1} }
}
\cs_generate_variant:Nn \sys_shell_now:n { x }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\sys_shell_shipout:n}
% Execute commands through shell escape at shipout.
% \begin{macrocode}
\sys_if_engine_luatex:TF
{
\cs_new_protected:Npn \sys_shell_shipout:n #1
{
\lua_shipout_e:n
{ l3kernel.shellescape(" \lua_escape:e { \tl_to_str:n {#1} } ") }
}
}
{
\cs_new_protected:Npn \sys_shell_shipout:n #1
{ \iow_shipout:Nn \c_@@_shell_stream_int {#1} }
}
\cs_generate_variant:Nn \sys_shell_shipout:n { x }
% \end{macrocode}
% \end{macro}
%
% \subsection{Dynamic (every job) code}
%
% \begin{macro}{\sys_everyjob:}
% \begin{macro}{\@@_everyjob:n}
% \begin{variable}{\g_@@_everyjob_tl}
% \begin{macrocode}
\cs_new_protected:Npn \sys_everyjob:
{
\tl_use:N \g_@@_everyjob_tl
\tl_gclear:N \g_@@_everyjob_tl
}
\cs_new_protected:Npn \@@_everyjob:n #1
{ \tl_gput_right:Nn \g_@@_everyjob_tl {#1} }
\tl_new:N \g_@@_everyjob_tl
% \end{macrocode}
% \end{variable}
% \end{macro}
% \end{macro}
%
% \subsubsection{The name of the job}
%
% \begin{variable}{\c_sys_jobname_str}
% Inherited from the \LaTeX3 name for the primitive: this needs to
% actually contain the text of the job name rather than the name of
% the primitive, of course.
% \begin{macrocode}
\@@_everyjob:n
{ \str_const:Nx \c_sys_jobname_str { \tex_jobname:D } }
% \end{macrocode}
% \end{variable}
%
% \subsubsection{Time and date}
%
% \begin{variable}
% {
% \c_sys_minute_int,
% \c_sys_hour_int,
% \c_sys_day_int,
% \c_sys_month_int,
% \c_sys_year_int,
% }
% Copies of the information provided by \TeX{}. There is a lot of defensive
% code in package mode: someone may have moved the primitives, and they can
% only be recovered if we have \tn{primitive} and it is working correctly.
% For Ini\TeX{} of course that is all redundant but does no harm.
% \begin{macrocode}
\@@_everyjob:n
{
\group_begin:
\cs_set:Npn \@@_tmp:w #1
{
\str_if_eq:eeTF { \cs_meaning:N #1 } { \token_to_str:N #1 }
{ #1 }
{
\cs_if_exist:NTF \tex_primitive:D
{
\bool_lazy_and:nnTF
{ \sys_if_engine_xetex_p: }
{
\int_compare_p:nNn
{ \exp_after:wN \use_none:n \tex_XeTeXrevision:D }
< { 99999 }
}
{ 0 }
{ \tex_primitive:D #1 }
}
{ 0 }
}
}
\int_const:Nn \c_sys_minute_int
{ \int_mod:nn { \@@_tmp:w \time } { 60 } }
\int_const:Nn \c_sys_hour_int
{ \int_div_truncate:nn { \@@_tmp:w \time } { 60 } }
\int_const:Nn \c_sys_day_int { \@@_tmp:w \day }
\int_const:Nn \c_sys_month_int { \@@_tmp:w \month }
\int_const:Nn \c_sys_year_int { \@@_tmp:w \year }
\group_end:
}
% \end{macrocode}
% \end{variable}
%
% \subsubsection{Random numbers}
%
% \begin{macro}[EXP]{\sys_rand_seed:}
% Unpack the primitive. When random numbers are not available, we
% return zero after an error (and incidentally make sure the number of
% expansions needed is the same as with random numbers available).
% \begin{macrocode}
\@@_everyjob:n
{
\sys_if_rand_exist:TF
{ \cs_new:Npn \sys_rand_seed: { \tex_the:D \tex_randomseed:D } }
{
\cs_new:Npn \sys_rand_seed:
{
\int_value:w
\__kernel_msg_expandable_error:nnn { kernel } { fp-no-random }
{ \sys_rand_seed: }
\c_zero_int
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\sys_gset_rand_seed:n}
% The primitive always assigns the seed globally.
% \begin{macrocode}
\@@_everyjob:n
{
\sys_if_rand_exist:TF
{
\cs_new_protected:Npn \sys_gset_rand_seed:n #1
{ \tex_setrandomseed:D \int_eval:n {#1} \exp_stop_f: }
}
{
\cs_new_protected:Npn \sys_gset_rand_seed:n #1
{
\__kernel_msg_error:nnn { kernel } { fp-no-random }
{ \sys_gset_rand_seed:n {#1} }
}
}
}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Access to the shell}
%
% \begin{variable}{\c_sys_shell_escape_int}
% Expose the engine's shell escape status to the user.
% \begin{macrocode}
\@@_everyjob:n
{
\int_const:Nn \c_sys_shell_escape_int
{
\sys_if_engine_luatex:TF
{
\tex_directlua:D
{ tex.sprint(status.shell_escape~or~os.execute()) }
}
{ \tex_shellescape:D }
}
}
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[EXP, pTF]{\sys_if_shell:, \sys_if_shell_unrestricted:, \sys_if_shell_restricted:}
% Performs a check for whether shell escape is enabled. The first set
% of functions returns true if either of restricted or unrestricted
% shell escape is enabled, while the other two sets of functions
% return true in only one of these two cases.
% \begin{macrocode}
\@@_everyjob:n
{
\@@_const:nn { sys_if_shell }
{ \int_compare_p:nNn \c_sys_shell_escape_int > 0 }
\@@_const:nn { sys_if_shell_unrestricted }
{ \int_compare_p:nNn \c_sys_shell_escape_int = 1 }
\@@_const:nn { sys_if_shell_restricted }
{ \int_compare_p:nNn \c_sys_shell_escape_int = 2 }
}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Held over from \pkg{l3file}}
%
% \begin{variable}{\g_file_curr_name_str}
% \begin{macrocode}
\@@_everyjob:n
{ \str_gset:Nx \g_file_curr_name_str { \tex_jobname:D } }
% \end{macrocode}
% \end{variable}
%
% \subsection{Last-minute code}
%
% \begin{macro}{\sys_finalise:}
% \begin{macro}{\@@_finalise:n}
% \begin{variable}{\g_@@_finalise_tl}
% A simple hook to finalise the system-dependent layer. This is forced by
% the backend loader, which is forced by the main loader, so we do not need
% to include that here.
% \begin{macrocode}
\cs_new_protected:Npn \sys_finalise:
{
\sys_everyjob:
\tl_use:N \g_@@_finalise_tl
\tl_gclear:N \g_@@_finalise_tl
}
\cs_new_protected:Npn \@@_finalise:n #1
{ \tl_gput_right:Nn \g_@@_finalise_tl {#1} }
\tl_new:N \g_@@_finalise_tl
% \end{macrocode}
% \end{variable}
% \end{macro}
% \end{macro}
%
% \subsubsection{Detecting the output}
%
% \begin{macro}[pTF, EXP]
% {
% \sys_if_output_dvi:,
% \sys_if_output_pdf:
% }
% \begin{variable}{\c_sys_output_str}
% This is a simple enough concept: the two views here are complementary.
% \begin{macrocode}
\@@_finalise:n
{
\str_const:Nx \c_sys_output_str
{
\int_compare:nNnTF
{ \cs_if_exist_use:NF \tex_pdfoutput:D { 0 } } > { 0 }
{ pdf }
{ dvi }
}
\@@_const:nn { sys_if_output_dvi }
{ \str_if_eq_p:Vn \c_sys_output_str { dvi } }
\@@_const:nn { sys_if_output_pdf }
{ \str_if_eq_p:Vn \c_sys_output_str { pdf } }
}
% \end{macrocode}
% \end{variable}
% \end{macro}
%
% \subsubsection{Configurations}
%
% \begin{variable}{\g_@@_backend_tl}
% As the backend has to be checked and possibly adjusted, the approach here
% is to create a variable and use that in a one-shot to set a constant.
% \begin{macrocode}
\tl_new:N \g_@@_backend_tl
\@@_finalise:n
{
\tl_gset:Nx \g_@@_backend_tl
{
\sys_if_engine_xetex:TF
{ xdvipdfmx }
{
\sys_if_output_pdf:TF
{ pdfmode }
{ dvips }
}
}
}
% \end{macrocode}
% If there is a class option set, and recognised, we pick it up: these
% will over-ride anything set automatically but will themsevles be
% over-written if there is a package option.
% \begin{macrocode}
\@@_finalise:n
{
\cs_if_exist:NT \@classoptionslist
{
\cs_if_eq:NNF \@classoptionslist \scan_stop:
{
\clist_map_inline:Nn \@classoptionslist
{
\str_case:nnT {#1}
{
{ dvipdfmx }
{ \tl_gset:Nn \g_@@_backend_tl { dvipdfmx } }
{ dvips }
{ \tl_gset:Nn \g_@@_backend_tl { dvips } }
{ dvisvgm }
{ \tl_gset:Nn \g_@@_backend_tl { dvisvgm } }
{ pdftex }
{ \tl_gset:Nn \g_@@_backend_tl { pdfmode } }
{ xetex }
{ \tl_gset:Nn \g_@@_backend_tl { xdvipdfmx } }
}
{ \clist_remove_all:Nn \@unusedoptionlist {#1} }
}
}
}
}
% \end{macrocode}
% \end{variable}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
%\end{implementation}
%
%\PrintIndex
|