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    <h2>Vim</h2> <p>Vim has a concept called a <a href="http://VimDoc.SourceForge.Net/htmldoc/usr_21.html#21.6" rel="noreferrer">modeline</a>. A modeline is a specially formatted line either withinin the first or last 5 lines of the textfile, which allows you to <code>:setlocal</code> local variables. For example, for C:</p> <pre><code> /* vi: set filetype=c fileencoding=UTF-8 shiftwidth=4 tabstop=4 expandtab */ </code></pre> <p>or Ruby:</p> <pre><code> # vi: set filetype=ruby fileencoding=UTF-8 shiftwidth=2 tabstop=2 expandtab </code></pre> <p><a href="http://VimDoc.SourceForge.Net/htmldoc/options.html#modeline" rel="noreferrer">Some more documentation</a>.</p> <h2>Emacs</h2> <p>Emacs has a similar concept, called <a href="http://GNU.Org/software/emacs/manual/html_node/emacs/Specifying-File-Variables.html#Specifying-File-Variables" rel="noreferrer">File Variables</a>.</p> <p>File Variables are either specified at the beginning of the file (in the first line, or if there is a shebang line, then in the second) in this form:</p> <pre><code>/* *-* mode: cc c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil *-* */ </code></pre> <p>or at the end:</p> <pre><code># Local Variables: # mode: ruby # coding: utf-8 # c-basic-offset: 2 # tab-width: 2 # indent-tabs-mode: nil # End: </code></pre> <h2>jEdit</h2> <p>jEdit calls this <a href="http://jEdit.Org/users-guide/buffer-local.html" rel="noreferrer">buffer-local properties</a>. The have to sit within the first or last 10 lines and look like this:</p> <pre><code># :mode=ruby:indentSize=2:tabSize=2:noTabs=true: </code></pre> <p>jEdit also uses the shebang line as a fallback for mode detection.</p> <h2>Komodo Edit</h2> <p>There is a plugin called <a href="http://Community.ActiveState.Com/forum/komode-modeline-support-komodo/" rel="noreferrer">Komode</a> (pun intended) which adds modeline support to Komodo Edit:</p> <pre><code># komode: le=unix language=ruby codepage=utf8 tab=2 notabs indent=2 </code></pre> <p>It also understands a limited subset of Vim modelines.</p> <h2>Others</h2> <p>A lot of other editors also have either their own variants of this, or support one of the above (usually Vim).</p> <h2>Python / Ruby encoding</h2> <p>Both Ruby 1.9 and Python require that the encoding for non-ASCII source files be explicitly specified. Fortunately, they do this in a way that is compatible with both Emacs and Vim modelines. (Basically, they look for the string <code>coding</code> followed by a non-word character followed by whitespace followed by a valid encoding name. Both Vim's <code>fileencoding=</code> and Emacs' <code>coding:</code> satisfy these requirements.)</p> <h2>Modeline Generator</h2> <p>Here is a simple <a href="http://Wireshark.Org/tools/modelines.html" rel="noreferrer">modeline generator</a>, which generates modelines for Vim, Emacs and jEdit.</p>
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    1. COa great answer for many editors
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