1

I currently have a set of default LaTeX packages I use frequently formatted as follows:

package1
[options]package2
[options]package3
package4
...

I would like to be able to convert this to standard LaTeX notation of \usepackage[options]{package} or \usepackage{package} depending on whether the package has additional options. I have successfully created a sed/regex command to convert the lines with options, but it misses the packages without options. 

echo "[option]package" | sed 's/.*\(\[[^]]*\]\)\(.*\)/\\usepackage\1{\2}/'
>> \usepackage[option]{package}

When this is run on a line with just a package, it fails (as I would expect).

echo "package" | sed 's/.*\(\[[^]]*\]\)\(.*\)/\\usepackage\1{\2}/'
>> package

Is this a regex problem and if so, how should I approach it?

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2 Answers 2

Reset to default
2

Please verify if this works for you:

$ echo -e "[options]package3\npackage4" | sed 's/^\(\[[^]]*\]\)\?\(.*\)/\\usepackage\1{\2}/'
\usepackage[options]{package3}
\usepackage{package4}

I replaced .* with ^ to match the start of line and added \? to make the brackets optional.

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0

This two-step approach seems to be simpler:

$ printf '%s\n' 'package1' '[options]package2' | sed -e 's/[^]]*$/{&}/' -e 's/^/\\usepackage/'
\usepackage{package1}
\usepackage[options]{package2}
  • The first step, s/[^]]*$/{&}/, puts the project name into curly braces by matching the longest possible string of characters other than ], up to the end of the line.
  • The second step, s/^/\\usepackage/, simply prepends \usepackage to the beginning of the line.
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