抱歉，又是我。Gonzalo 向我介绍了 framed 包中非常好的 leftbar 环境，我现在用它来处理定义、定理和类似的环境。现在我遇到了一个新问题：leftbar 环境内的脚注 (\footnote) 未显示！标签在那里，但没有带有相应编号的脚注。
根据这里和类似来源，可以使用 \footnotemark 和 \footnotetext 来修复此问题。问题是：我正在使用 SWP，并希望使用 \footnote 命令来添加脚注。我想到了类似这样的方法：
\renewcommand{\footnote}[1]{\footnotemark \footnotetext{#1}}
但是 \footnotemark 和 \footnotetext 需要标签。所以我最想要的是类似
\renewcommand{\footnote}[1]{\footnotemark[some arbitrary string "x" that cannot collide with an "x" from a different footnotemark] \footnotetext["x"]{#1}}
我尝试将 #1 本身用作“x”，但这会产生错误（这并不奇怪，因为它是未经净化的 LaTeX）。这里有技巧吗，还是我的语法错误？
编辑：我的更新命令无论如何都很愚蠢。诀窍是让 \footnotetext 出现结束后leftbar 环境。有没有办法通过 renewcommand 来获取它？
答案1
稍长的代码，允许您仅键入\footnote。这个想法是让每个脚注附加\footnotetext{#1}到一个标记列表。然后将此标记列表排版到正确的位置。需要一些技巧才能正确嵌套以及hyperref支持。通常，这可以用于其他（非逐字）环境。
代码中的注释。
\documentclass{article}
\usepackage{etoolbox} % for "\pretocmd".
\makeatletter
%
% User command, see the end of the preamble for use.
% We redefine the environment by adding "\savefoot@begin" at
% the beginning, and "\savefoot@end" at the end.
%
\newcommand{\DeclareSavefootEnvironment}[1]{%
\expandafter\pretocmd\csname #1\endcsname
{\savefoot@begin}{}{\savefoot@patch@error{#1}}%
\expandafter\pretocmd\csname end#1\endcsname
{\savefoot@end}{}{\savefoot@patch@error{#1}}%
}
\newcommand{\savefoot@patch@error}[1]{%
\PackageError{savefoot}{etoolbox failed to patch the environment #1, sorry}{}}
%
% Register allocation.
%
\newcount\c@savefoot@depth
\newtoks\savefoot@toks
%
% "\savefoot@begin" starts an environment which saves footnotes.
% We only want to output footnotes outside any such environment,
% so we count how deep we are in this kind of environment using
% the count "\c@savefoot@depth", which pretends to be a LaTeX
% counter.
%
% We will store all the "\footnotetext" into the toks
% "\savefoot@toks". This is initialized _locally_ at the start
% of each "savefoot" environment.
%
\newcommand{\savefoot@begin}{%
\advance\c@savefoot@depth by 1\relax
\savefoot@toks={}}
%
% When ending a savefoot environment, we check if it was the
% outermost one. In that case, "\@secondoftwo", we output the
% "\footnotetext" that we saved, after the end of the group.
% The "\endgroup" must be explicitly there; this is the case
% because of how "\end{...}" works in LaTeX2e.
%
% Since the register "\savefoot@toks" is restored at the end
% of the group, we need to expand it inside the group, then
% send "\savefoot@append{<expanded \savefoot@toks>}" after the
% "\endgroup", hence the "\expandafter"s. Same thing when we
% need to typeset.
%
\newcommand{\savefoot@end}{%
\ifnum\c@savefoot@depth>\@ne
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi
{% Nested, don't output, save to the level above.
\expandafter\do@after@explicit@endgroup\expandafter{%
\expandafter\savefoot@append\expandafter{\the\savefoot@toks}}%
}%
{% Outside, output.
\expandafter\do@after@explicit@endgroup\expandafter{%
\the\savefoot@toks}%
}%
}
%
% Appending to a toks is standard.
%
\newcommand{\savefoot@append}[1]{%
\savefoot@toks\expandafter{\the\savefoot@toks#1}}%
%
% To put after "\endgroup", we need delimited parameters,
% hence the "\def". We first check that the command is new,
% just in case.
%
\newcommand{\do@after@explicit@endgroup}{}
\def\do@after@explicit@endgroup#1#2\endgroup{#2\endgroup#1}
%
% Now the footnote command. We save the old definition,
% used in the case where we are outside any savefoot
% environment. If we are inside a savefoot environment,
% place the "\footnotemark", and append
%
% \savefoot@setcounter{<explicit number>}\footnotetext{<text>}
%
% to our register. This will be typeset at the end. We cannot
% just do "\footnotetext[<explicit number>]{<text>}", because
% the hyperref package does not like that.
%
\let\savefoot@old@footnote\footnote
\renewcommand{\footnote}[1]{%
\ifnum\c@savefoot@depth>\z@
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi
{% Inside a leftbar, save the text in the relevant toks.
\footnotemark
\savefoot@toks=\expandafter{%
\the\expandafter\savefoot@toks
\expandafter\savefoot@setcounter\expandafter{\the\c@footnote}%
\footnotetext{#1}%
}%
}%
{% Don't save, just typeset.
\savefoot@old@footnote{#1}%
}%
}
%
% When not using hyperref, just give the counter "footnote"
% the right value (in that case, "\savefoot@hhyperref@support{#1}"
% will be defined to do nothing).
%
\newcommand{\savefoot@setcounter}[1]{%
\setcounter{footnote}{#1}%
\savefoot@hyperref@support{#1}%
}
%
% Getting "\footnotetext" and "\footnotemark" to work with hyperref
% is non-trivial, and I probably did something wrong. But at first
% sight it seems ok.
%
\newcommand{\savefoot@hyperref@support}[1]{%
\setcounter{Hfootnote}{#1}%
\global \let \Hy@saved@currentHlabel \@currentHlabel
\global \let \Hy@saved@currentHref \@currentHref
\hyper@makecurrent {Hfootnote}%
\global \let \Hy@footnote@currentHlabel \@currentHlabel
\global \let \Hy@footnote@currentHref \@currentHref
\global \let \@currentHlabel \Hy@saved@currentHlabel
\global \let \@currentHref \Hy@saved@currentHref
}
%
% If hyperref is not loaded, we disable the hyperref support.
% We check at the "\begin{document}".
%
\AtBeginDocument{%
\@ifpackageloaded{hyperref}{}{\let\savefoot@hyperref@support\@gobble}%
}
\makeatother
% ============= Example =====================
\usepackage{framed}
\usepackage{hyperref}
\DeclareSavefootEnvironment{leftbar}
\begin{document}
Some text,\footnote{With a normal footnote.} in which
footnotes are preserved.\footnote{Even when you put several
in a row.}\footnote{Like this.}
\begin{leftbar}
Also true for the leftbar environment.\footnote{The relevant
commands are placed after the end of the environment.}
\begin{leftbar}
And we check that nesting works.\footnote{That was the tricky part\ldots}
\end{leftbar}
Maybe it breaks after nesting?\footnote{Let's see.}
\end{leftbar}
More footnotes.\footnote{Like this.}\footnote{And that.}
\begin{leftbar}
And another leftbar environment to be sure.\footnote{Does it
work? I'll see soon, when I compile.}
\end{leftbar}
\end{document}
答案2
您可以使用曼尼福特包；一个小例子：
\documentclass{article}
\usepackage{manyfoot}
\usepackage{framed}
\DeclareNewFootnote{B}
\begin{document}
text text\footnote{a standard footnote.}
\begin{leftbar}
text text\FootnoteB{*}{text}
\end{leftbar}
\FootnotetextB{*}{a footnote with a manual mark.}
\end{document}
包文档解释了包提供给您的自定义脚注的所有选项。