{expansion} is about expanding tokens, including the manipulation of expansion order and the suppressing of expansion.

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5
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1answer
397 views

Preprocessing Latex: What is your workflow? Your tools?

I know, for various reason, some users preprocess their latex file using Perl or sed, say. I'm considering doing this to, so I would like to seek your guidance, to smooth my entry in this area. My ...
6
votes
2answers
165 views

Delaying command expansion that appears in \begin handler until \end handler executes

I have a custom environment for handling a code interface declaration that is specified as: \begin{decl}{FOO} \param{in}{bar} the bar input parameter \param{out}{baz} the baz input parameter ...
14
votes
2answers
1k views

Expanding arguments before macro call

I've been banging my head against this for days. I have a macro which takes a macro name and its arguments. It then re-arranges the arguments a bit and then calls the passed macro with the re-arranged ...
4
votes
2answers
124 views

List of tokens from TeX mouth

Is it possible to get list of tokens which comes from TeX "mouth"? If I understand correctly: in mouth all macros, conditionals and special operations (like \the and \input) are expanded and then goes ...
1
vote
1answer
95 views

How to expand keyval options immediately

I am trying to build up a macro that creates other macros depending on kvoptions' options. But then, the outcoming macros are dependent on the actual state of the options instead of their state at the ...
3
votes
1answer
342 views

How to use commands in table specs, and still support array package?

For a package, I want to write code that creates tables, where the exact type of table is configurable (tabular, longtable, tabularx, ... [Update: David rightly remarked that formats like tabularx ...
4
votes
1answer
359 views

At which point does \immediate\write write to file?

Assume I have opened a file myfile and write to it with \immediate\write\myfile{My cat is too old} I have multiple such statements in my document and do calculations in between which influence the ...
4
votes
0answers
253 views

\ref, \autoref and hyperref expansion

I'm trying to write section numbers to a file with the newfile package. In details, this MWE basically tries to write to a .ref file with lines like A-B. The A and B are generated by \label and \ref ...
10
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5answers
461 views

How to create a “delay expansion” environment?

I don't want to use the following \begingroup \edef\next{\endgroup \noexpand\const{Xp}{\X(tp)} \noexpand\const{Yp}{\Y(tp)} \noexpand\const{Xf}{\X(tf)} \noexpand\const{Yf}{\Y(tf)} ...
2
votes
1answer
74 views

Specify file name shell access via \@@input

Background: I need to perform a conditional branch based on the first three characters of a file. I found a rather simple solution (on a Unix system, or PC with cygwin installed): head -1 ...
14
votes
2answers
334 views

LaTeX3: How to get reliable control over the level of expansion?

Say you want to write LaTeX3 code that manages user data. Sometimes you want to process that data, but other times you just want to store it, move it around and return it unchanged (when developing a ...
15
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3answers
307 views

Parsing strings containing diacritical marks (macros?)

I apologize that this question may seem very much like several other recent ones I have asked (Parsing leading hardspaces, Parsing a \$ as part of an improved \getargs command). They are all related ...
6
votes
1answer
114 views

\def variables with xparse and other questions about variables

I'm writing a documentation for a REST API. So there's very much information that has to get repeated. So I'm trying to figure out a few things: Consider the following code: ...
4
votes
1answer
263 views

Expand macro immediately in \pagenote

I'm trying to use the contents of a macro in a \pagenote, using the memoir class: \documentclass{memoir} \makepagenote \def\myvar{Good morning.} \begin{document} In the morning\pagenote{\myvar} ...
5
votes
2answers
198 views

Variadic arguments macro

I am trying to make macro with variadic arguments, iterating over them. The final result is supposed to be: \foreach[x]((var = \x )){foo}{bar}{baz}\null evals to var = foo var = bar var = baz My ...
7
votes
3answers
730 views

\uline within a pgfmath expression produces an error

Why does using \uline within a pgfmath expression result in an error? \documentclass{article} \usepackage[normalem]{ulem} \usepackage{tikz} \begin{document} \pgfmathparse{width("\uline{blabla}")} ...
7
votes
1answer
143 views

Forcing macro expansion with keyval

While trying to provide an answer to this question, I've run into a stumbling block that I can't seem to get over. The listings package (like many others) uses keyval to handle configuration. What ...
7
votes
2answers
114 views

Is there a way of defining a command \nullifyifmoved{arg} that will normally act like its argument but act like a no-op if the macro is “moved”?

I'm interested in a macro \nullifyifmoved that takes one argument arg and acts like arg in normal contexts, except it acts like a no-op wherever it is written to a file. Some background: Martin ...
3
votes
1answer
69 views

List Version of \str_if_eq

I am using \str_if_eq:xxTF{\A}{\Target}{<true>}{<false} to execute the <true> or <false> code if \A=\Target. What is the list version equivalent of this? So I am looking for ...
9
votes
1answer
154 views

Is there a way of defining a command which is automatically converted to a no-op after its first execution?

Is there a way of defining a command that can be executed only once and is then redefined to be a no-op? Related: Is there a way of defining a command \nullifyifmoved{arg} that will normally act ...
4
votes
3answers
134 views

Macro to be used in a \section command that has no effect in the table of contents

I need a macro that is executed only in the main document (within a section title) and then disappears (for the table of contents). A minimal example where this occurs is this: ...
5
votes
3answers
147 views

Metacommand for commands that dynamically select a parameter?

Original question I would like to create a metacommand for creating new projection commands. Specifically, \newproj{\cmd}{<n>}{<m>} should create \cmd as a new command of <n> ...
5
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2answers
108 views

passing current content of commands to a macro

I am sorry for this is probably a current question with a well known answer, but I was not able to google it out. I am trying to build a macro adding content step by step; at every step I need to ...
4
votes
1answer
129 views

Expanded StrSubstitute

I am trying to use \StrSubstitute, but what I want is to expand it all the way to get the result string. \StrSubstitute{Řepa}{Ř}{Rzzz} then i use it with % somehow define \a as the result string ...
13
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2answers
961 views

Allow underscore in PGFPlots tick labels read from table

I'm trying to use the text data from a table column as the tick labels in a plot. The text data contains underscores, which makes LaTeX throw a Missing $ inserted error. I'd usually get around this by ...
25
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3answers
639 views

A guide to understanding expandability: when to write protected functions and when not to

I'm having difficulty understanding (and appreciating) the concept of expandability. I'm very murky about understanding when and how expandability impacts me in writing code for my documents. I've ...
2
votes
1answer
133 views

Passing name ending with number to \csname does not work [duplicate]

Possible Duplicate: macro names with special characters When I use \yyy defined bellow it does not print yyy, but if I use \xxx it prints xxx. How can I make \yyy work? \def\P1{yyy} ...
9
votes
1answer
1k views

Difference between \newcommand and \pgfmathsetmacro used in TikZ \coordinate

Consider the following code: \documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} \newcommand{\MA}{4} \pgfmathsetmacro{\MB}{4}; \coordinate (V11) at (0,0); ...
8
votes
3answers
190 views

Nested use of \ifcsname needs protection

I have a macro \command to ensure that the names of macros in my documentation are consistently formatted. Been work great, until I had an urge to procrastinate and had this brilliant idea that I can ...
5
votes
1answer
315 views

How to use macros in command \dirtree of package dirtree?

I want to print a tree structure and started using the package dirtree (v0.32, see Making a (simple) directory tree). Following calls work smooth: \dirtree{.1 root. .2 child1. .2 child2. .3 ...
3
votes
1answer
501 views

Using “German” quotation marks inside \newcommand [duplicate]

Possible Duplicate: babel shorthand "| doesn’t work in macros I know there is a deeper non-understanding of LaTeX mechanics at work here, but I have no idea how to phrase my question ...
7
votes
1answer
95 views

Define macro based on Datatool contents

I can define a macro of the form \csname../dirX Color\endcsname manually and use it as desired. However, I am unable to do the same thing based on the contents as read by the datatool package. The ...
6
votes
3answers
133 views

reproduce section at different position

I would like to reproduce a \section at a later position, with the same number as at the original position. I tried \newsavebox{\meinebox} \savebox{\meinebox}[80mm][l]{\section{Hier}} ...
7
votes
1answer
206 views

\ifmmode self-contradictory in amsmath (OK in just LaTeX)

File: \documentclass[11pt]{article} \usepackage{amsmath} \newcommand{\argghhh}{\relax\ifmmode\bar\else\expandafter\=\fi} \begin{document} $ \argghhh a $ \end{document} produces error (but ...
3
votes
1answer
100 views

using \ForEach to input chapters in a document

I have several chapters in the folder /Chapters and I have the following LaTeX code: \newcommand\chapnames{Chap1, Chap2, Chap3, Chap4, Chap5, Chap6} \ForEach {,} {\input{./Chapters/\thislevelitem}} ...
18
votes
1answer
324 views

Unusual numbering: combine alph, Alph, arabic

I would like to have an unusual numbering aAa going as follows: 0 -> * ------------------------- 1 -> a 2 -> b ... 25 -> y 26 -> z ------------------------- 27 -> A 28 -> B ...
2
votes
1answer
73 views

Pass the contents of an \input command to a macro

I am having some difficulty with the expansion of LaTeX. I would like to expand the contents of an \input command before passing them to macro, in a pattern similar to the following: \outer{\inner} ...
8
votes
1answer
103 views

Omitting arguments in macro expansion

Changing a simple TeX macro like \def\macro#1 #2{#1 #2} into \def\macro#1 #2{#1} alters the output of \macro Hello world surprisingly for me to Helloorld My expectation would have been to ...
4
votes
1answer
134 views

Expansion Issue with omit list provided to \DTLdisplaydb

In my DB the number of columns is rather large. Hence, I am trying to eliminate any columns which contain only 0 entries. The number of columns, nor the column keys, are know upfront. So, I step ...
5
votes
1answer
91 views

String lowercase equality (newbie question)

i'd like to test if a string, once transformed into lowercase is equal to a given string. Here a MWE of what i'm talking about : \documentclass[a4paper,10pt]{report} \usepackage[francais]{babel} ...
10
votes
3answers
181 views

\expandafter and counters not playing nicely

My google-fu has finally failed me... I'm trying to write a package that will allow you say \addauthor{name, email} several times and have the title page properly formatted. Here is a minimal example ...
10
votes
1answer
123 views

Environment with delayed expansion

I'm trying to define an environment test that stores its contents unexpanded in a macro \testcontents. For example, the code \newcommand{\cmd}{bad} \begin{test} \cmd \end{test} ...
9
votes
3answers
279 views

Write on a file and input it

I'm trying to redefine a \tableofcontents-like command. I proceed this way : the displayed elements are written to a file, and the file is input when I want the display. If I know the toc will be ...
9
votes
5answers
314 views

Parse dotted string, extracting last part

I want a macro that will separate a string like "1.2.3" into two parts: the part until the last dot (call that the context) and the last number. This seems a pretty basic application of a helper ...
9
votes
1answer
242 views

Using \typeout behaviour different with \newtoks vs. \def

I feel as I really should know this, but sadly I don't. Why is the output of \typeout{\the\myToken} not the same as having it printed in the PDF as \the\myToken. No problem with a \def, just with ...
3
votes
1answer
84 views

how to return protected command with one argument already validated in latex/tex?

I want a command that will create an unevaluated bit of LaTeX/TeX code (to be evaluated at the end of an environment, but this is not necessary information) that has been created using an evaluated ...
16
votes
3answers
417 views

(Why) Can't we get 'fully expandable' versions of every command?

I'm just starting to figure out what 'expandable' means in LaTeX, and why it is useful to have commands that expand as far as possible. In particular: If you want to \typeout some string to the log ...
6
votes
3answers
150 views

Expansion issue when adding to CSV list from within a \foreach

Another expansion issue that I am unable to guess at the correct combination of \edef/\expandafters to get to work. Background: Below I have defined \AddToCommaSeparateList which uses \g@addto@macro ...
2
votes
1answer
142 views

Use result from pgfmath with xifthen

I try to use the results of pgfmath calculations with cnttest from xifthen, but it fails: \documentclass{article} \usepackage{pgf,xifthen} \begin{document} \pgfmathparse{42+77}% ...
4
votes
1answer
83 views

Error with expansions

I am getting an error while trying to compile this minimal example: min.cls: \ProvidesClass{min} \LoadClass{minimal} \NeedsTeXFormat{LaTeX2e} \newenvironment{myenv}{}{ \def\aaa{test } ...