June 26, 2008

Don't forget the text editor

Author: Alan Berg

Text editors are important for many tasks, from editing configuration files, nudging cron jobs, and manipulating XML files to quickly pushing out a README. Luckily, there are a number of interesting editors available. Here's a brief introduction to nine intriguing choices. While some may be better suited to certain tasks, it's no one tool is better than another for all tasks. Try them all and use the ones you like best.

vi

Old favorite vi (or one of its variants, such as Vim or Elvis) is available on most *nix systems. If you are a system administrator moving from one *nix system to another, the one reliable fact is that vi will work, macros and all. Once you have learned the keystrokes, swapping words at the boundaries, replacing sections of text, or transversing through a large file with vi is efficient, fast, and predictable. However, its initial learning curve is somewhat steep, and there is no real GUI.

Gedit and Kate

Gedit (see figure 1) is a small and lightweight text editor for the GNOME desktop, and the default text editor for Ubuntu. An excellent tool with syntax highlighting for a wealth of scripting and programming languages, it allows for extension via plugins (figure 2) and does most tasks efficiently, without fuss.

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The editor is modern in design, with a tab per open file, thus allowing for easy cut and pasting between documents. The interface is uncluttered and somewhat configurable via Edit -> Preferences for such attributes as the enabling of allowing line numbering and changing tabs to spaces.

You can also run Kate (KDE Advanced Text Editor) under the GNOME desktop. However, you will have to install its package with a command like sudo apt-get install kate-plugins, which will also install some extra plugin-enabled functionality. Kate has a slightly busier interface than Gedit (figure 3), and to use tabbing between documents, you must activate the feature via enabling the correct plugin. But Kate is significantly more configurable than Gedit, exposing more of its innards as preferences.

An immediately helpful feature is the ability to hide code that is within a certain scope. For example, to hide all the code within a foreach statement, double-click on the offending line. This is a significant help for uncluttering verbose scripting text. Also, under the Tools menu, you can change the end of line type to switch between Unix, DOS, and Mac, thus avoiding subtle issues in your text later.

Both Kate and Gedit support quick ad-hoc editing of numerous scripting and programming languages. They are both excellent editors for a variety of tasks.

TEA and Emacs

Emacs and TEA are more complex and configurable than Gedit and Kate, with a much wider scope of potential abilities. If you want to work within a single environment, including sending mail, then these adaptive tools have the power to let you.

TEA (figure 4) is a compact, configurable, and function-rich editor that takes up only around 500KB of memory. TEA provides a decent text editor, with markup support for LaTeX, DocBook, Wikipedia, and HTML. It does not provide any syntax highlighting, but does provide an extremely basic project environment for compiling code.

Thankfully, TEA also contains a delightfully named crapbook (read notes holder) for storing temporary text. The editor provides a spell checker and statistics for documents and therefore sits comfortably between an office suite and a plain editor. Other functionality includes a file browser and a calendar. Because the editor's compact size is based on the fact that it relies heavily on using external tools, under the Help menu there is a well-thought-out self-check command that on activation mentions any missing dependencies.

You can extend TEA via manipulating text files to expand specific features. For example, to add your own command to the Run menu, open the ext_programs text file via File -> Manage utility Files -> External programs to add the option xterm, which activates -- yes, you guessed it -- an xterm window. Add and save the text on a new line:

xterm=xterm &

Emacs(figure 5) is powerful, feature-rich, and configurable. This tool has a long history reaching back as far as 1976. Originally written by Richard Stallman and Guy Steele, Emacs split into two main branches, Xemacs and Emacs, in 1991. The functionality in both branches is comparable. Having a long and renowned history implies fitness of purpose and core stability.

Emacs is not only a text editor but also an interpreter for Emacs Lisp, an extension of the Lisp programming language. Elisp makes scripting relatively easy. If you are a power user, you can tweak the .emacs configuration file (or whatever your local equivalent is) to, for example, add extra menus.

People have written a large number of modes in the Elisp language exist. A mode is an extension, modification, or enhancement. For example, one mode may be for SQL development, and another for Perl programming. The main Emacs wiki details the most up-to-date information and lists a full set of potential modes.

Emacs' default GUI is succinct and contains much functionality beyond editing. You can perform file navigation, send out email (if configured correctly), and perform specific tasks such as debugging, patching, and creating diffs with a few succinct keystrokes.

The software's documentation and international language support is superb, and the editor includes an online tutorial.

Gaining full mastery of Emacs, even for the cleverest among us, requires patience and time. The intuitive use of buffers or the memorizing of Ctrl and Alt keystroke combinations is a chore, but if you perfect it, expect massive gains in efficiency.

Leafpad, Mousepad, and Medit

If you are looking for a simple editor that does the bare minimum, then either Leafpad or Mousepad will fulfill the basics. They look the same and allow for word wrap, line numbering, auto indent, and a choice of fonts, and not much else.

Medit is a straightforward text editor with syntax highlighting and tabbed panes. To add an entry to its configurable tool menu (figure 6) select Settings -> Preferences then highlight the Tools option. Clicking on the new item icon (the picture of a document with the orange circle at the bottom center) activates a dialog. Change the name of the item from "new command," then add the entries displayed in figure 5. You will then have a new tool that lists in the currently selected document all the running processes (figure 7). For the devotees, Medit has its own scripting language, called mooscript.

The editor also has a well placed expandable no fuss file selector that is readily available via a click on the right side of the main window.

SciTE

SciTE, the Scintilla-based text editor, offers some of the features of a programmer's interactive development environment. It supports tab panes, syntax highlighting, and code folding, and goes a solid step further for programmers. For example, on opening a Perl file, or numerous other languages, you can check a script's basic validity via the menu option Tools -> Check syntax. That displays a second window (figure 8) with the gruesome details.

SciTE presents a no-fuss, easy-to-learn approach to controlling a scripting environment. A development tool like Eclipse will give you more features and adaptability, but also a steeper learning curve.

Final comments

This article covers only a fraction of the available text editors for the Linux desktop. If I have missed your favorite, share your opinion and place a link in the comments section for this article.

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