# Remove keywords from code 'listings'

I tried to customize a code listing to support some pseudo-code format that suited me best. It was easy to add keywords using otherkeywords or morekeywords, but the opposite, the deletekeywords did not work as expected. If the stem of a word was defined as a keyword, the word would be highlighted. For example, if create is in morekeywords, then created is also highlighted except the d in the end. Adding created to the deletekeywords list is not helping.

Please suggest how I could solve this problem.

\documentclass[12pt]{article}
\usepackage{fancyhdr}
\usepackage[ansinew]{inputenc} %Windows-1252 encoding
\usepackage{listings}
\usepackage[english]{babel}

\usepackage[usenames,dvipsnames]{color}
\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.4,0.4,0.4}
\definecolor{lightgray}{rgb}{0.9,0.9,0.9}
\definecolor{mauve}{rgb}{0.58,0,0.82}

\lstset{numbers=left,
numbersep=5pt,
basicstyle=\sffamily\tiny,
numberstyle=\tiny\color{gray},
keywordstyle=\color{blue},
stringstyle=\color{mauve},
backgroundcolor=\color{lightgray},
frame=single,
columns=fullflexible
}

\begin{document}

\title{}
\author{}

\maketitle

\section{somesection}

\lstset{language=Python, caption=somecaption, otherkeywords={smooth}, deletekeywords={smoothed, is, not}}

\begin{figure}[h]
\begin{lstlisting}
smooth is welcome
smoothed is not
\end{lstlisting}
\end{figure}

\end{document}

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Welcome to TeX.SE. It is always best to compose a fully compilable MWE that illustrates the problem including the \documentclass and the appropriate packages so that those trying to help don't have to recreate it. – Peter Grill Mar 6 '12 at 18:24
You are right. It is my mistake. I have added code. – Subhamoy Sengupta Mar 6 '12 at 19:29
If you use keywords={smooth} instead, everything works fine. Moreover, otherkeywords is defined for keywords containing non-letter elements. Is there any reason why you're using otherkeywords? – Werner Mar 6 '12 at 19:52
Very silly of me! I did not realize I could use keywords. I thought otherkeywords or morekeywords is the one I should use to add more keywords to the set. Thank you very much! – Subhamoy Sengupta Mar 6 '12 at 20:09
I looked into it a bit, and keywords is not what I want, because it resets the list of keywords and the ones listed inside keywords are the only keywords that get highlighted. – Subhamoy Sengupta Mar 7 '12 at 9:46

Rather use keywords={smooth} instead of otherkeywords. According to the listings documentation, the latter

Here's an updated MWE showing the desired output:

\documentclass[12pt]{article}
\usepackage{listings}% http://ctan.org/pkg/listings

\usepackage[usenames,dvipsnames]{color}
\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.4,0.4,0.4}
\definecolor{lightgray}{rgb}{0.9,0.9,0.9}
\definecolor{mauve}{rgb}{0.58,0,0.82}

\lstset{numbers=left,
numbersep=5pt,
basicstyle=\sffamily\tiny,
numberstyle=\tiny\color{gray},
keywordstyle=\color{blue},
stringstyle=\color{mauve},
backgroundcolor=\color{lightgray},
frame=single,
columns=fullflexible
}

\begin{document}

\title{}
\author{}

\maketitle

\section{somesection}

\lstset{language=Python, caption=somecaption, keywords={smooth}}

\begin{figure}[h]
\begin{lstlisting}
smooth is welcome
smoothed is not
\end{lstlisting}
\end{figure}

\end{document}​


The above MWE specifies the keywords, but subsequently also overwrites the existing keywords supported by the language setting. To maintain the existing set and add more/remove some, use morekeywords={smooth}, deletekeywords={is,not}.

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I thought there was a problem with using keywords as this resest the existing keywords and hence the reason for otherkeywords? – Peter Grill Mar 6 '12 at 23:45
That is exactly what I was about to comment on. Using only keywords seems to remove all Python keywords, which I do not want. That was the reason I used otherkeywords to begin with. – Subhamoy Sengupta Mar 7 '12 at 9:45
@SubhamoySengupta: I've updated my answer with the use of morekeywords={smooth},deletekeywords={is,not}, which seems to be what you're after. – Werner Mar 8 '12 at 6:26