139 lines
9.1 KiB
HTML
139 lines
9.1 KiB
HTML
<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"../../html-dtd/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-US">
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<head>
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<!--
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*
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* Copyright 2008-2009, Haiku. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Humdinger <humdingerb@gmail.com>
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*
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-->
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<meta http-equiv="Content-Style-Type" content="text/css" />
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<meta name="robots" content="all" />
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<title>Queries</title>
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<link rel="stylesheet" type="text/css" href="../../Haiku-doc.css" />
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</head>
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<body>
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<div class="logo">
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<img src="../images/logo.png" alt="logo" width="372" height="86" />
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<div class="title">Queries</div>
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</div>
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<div class="topnav">
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<p>
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<a href="contents.html">Contents</a>
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Previous: <a href="index.html">Index</a>
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Next: <a href="workshop-filetypes+attributes.html">Workshop</a>
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</p>
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</div>
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<div class="content">
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<table class="index" id="index" name="index" summary="index" align="right">
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<tr class="heading"><td>Index</td></tr>
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<tr class="index"><td>
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<a href="#find-window">The Find window</a><br />
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<a href="#basic-query">Basic queries - "by Name"</a><br />
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<a href="#adv-query">Advanced queries - "by Attribute"</a><br />
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<a href="#more-adv-query">Even more advanced queries - "by Formula"</a><br />
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<a href="#result-window">The result window</a>
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</td></tr>
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</table>
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<p>A query is a file search based on file attributes and can be performed within Tracker or in Terminal. Queries are saved in <span class="path">/boot/home/queries/</span> and by default last seven days before being purged. Note, these aren't static result lists of your search, but are the query formulas which trigger a new search whenever you open them.<br />
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Even better, you don't have to double-click to re-do a query. You can <a href="tracker.html#navigating">drill down</a> a saved query just like any folder by right-clicking on it and navigating through the submenus.</p>
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<h1>
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<a href="#index"><img src="../images/up.png" align="right" alt="index" border="0" width="16" height="16" /></a>
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<a id="find-window" name="find-window">The Find window</a></h1>
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<p>You start a query by invoking the <span class="menu">Find...</span> menu either from the Deskbar menu or any Tracker window or the Desktop (which is actually a fullscreen Tracker window). The shortcut is <span class="key">ALT</span> <span class="key">F</span>. You're presented with the Find window:</p>
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<img src="images/queries-images/basic-query.png" alt="basic-query.png" />
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<ol>
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<li><p>Select previous or saved queries or save the current query.</p></li>
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<li><p>Narrow down your search from "All files and folders" to specific file
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types.</p></li>
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<li>Define the search method:<ul>
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<li><span class="menu">by Name</span> - a basic search by filename</li>
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<li><span class="menu">by Attribute</span> - an advanced search, you specify search terms for one or more attributes</li>
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<li><span class="menu">by Formula</span> - an even more advanced search, you can fine-tune a complex query term</li></ul></li>
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<li><p>Select which drives to search on.</p></li>
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<li><p>Enter the search term.</p></li>
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<li><p>The expander hides/unhides the additional options.</p></li>
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<li><p>Uncheck the <span class="menu">Temporary</span> checkbox if you don't want this query self-destruct after 7 days.</p></li>
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<li><p>Check if your query is supposed to <span class="menu">Include trash</span>.</p></li>
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<li><p>Optionally, enter a name for this query if you want to save it.</p></li>
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<li><p>You can drag&drop the icon to save the query.</p></li>
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</ol>
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<h1>
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<a href="#index"><img src="../images/up.png" align="right" alt="index" border="0" width="16" height="16" /></a>
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<a id="basic-query" name="basic-query">Basic queries - "by Name"</a></h1>
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<p>If you simply want to find all files on your mounted disks that match a certain pattern, simply leave the search method at "<span class="menu">by Name</span>", enter the search term into the text box and press <span class="key">ENTER</span>.</p>
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<h1>
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<a href="#index"><img src="../images/up.png" align="right" alt="index" border="0" width="16" height="16" /></a>
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<a id="adv-query" name="adv-query">Advanced queries - "by Attribute"</a></h1>
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<p>You can create more advanced queries by searching within the attributes of specific file types. For that to work, these attributes have to be <a href="index.html">indexed</a>.</p>
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<img src="images/queries-images/query-window.png" alt="query-window.png" />
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<p>You start by setting the filetype from "<span class="menu">All files and folders</span>" to "<span class="menu">text | E-mail</span>" and change the search method to "<span class="menu">by Attribute</span>".</p>
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<p>This adds a drop-down menu to the left of the textbox and the buttons "<span class="button">Add</span> and <span class="button">Remove</span> under that. From the menu you choose which attribute to query. With <span class="button">Add</span> and <span class="button">Remove</span> you can query additional attributes or remove them again. These attributes can be logically linked with AND/OR.</p>
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<p>Let's do an email query as an example:</p>
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<img src="images/queries-images/query-window-filled.png" alt="query-window-filled.png" />
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<p>This is your Find window when you're looking for all emails Clara Botters has sent to you in the last two months that had in the subject "vibraphone" or "skepticality".</p>
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<h1>
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<a href="#index"><img src="../images/up.png" align="right" alt="index" border="0" width="16" height="16" /></a>
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<a id="more-adv-query" name="more-adv-query">Even more advanced queries - "by Formula"</a></h1>
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<p>Typing in a formula query by hand is daunting and really quite unpractical. It still has its uses.</p>
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<p>Take the above query by attribute of Clara's mails concerning vibraphones etc. If you have all the attributes and their search terms set, try switching to "<span class="menu">by Formula</span>" mode and be overwhelmed by this one line query string:</p>
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<img src="images/queries-images/formula-query.png" alt="formula-query.png" />
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<p>Once more as text, edited for readability:</p>
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<pre>(((((MAIL:from=="*[cC][lL][aA][rR][aA] [bB][oO][tT][tT][eE][rR][sS]*")
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&&(MAIL:when>=%2 months%))
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&&(MAIL:subject=="*[vV][iI][bB][rR][aA][pP][hH][oO][nN][eE]*"))
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||(MAIL:subject=="*[sS][kK][eE][pP][tT][iI][cC][aA][lL][iI][tT][yY]*"))
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&&(BEOS:TYPE=="text/x-email"))</pre>
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<p>What's the use?</p>
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<ul>
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<li><p>You could copy and paste the string into an email, forum or IRC for others to use or debug.</p></li>
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<li><p>You can use this method to construct a query in <span class="menu">Attribute</span> mode and then switch to <span class="menu">Formula</span> mode, to comfortably generate a search string to use for a query in Terminal or a script.</p></li>
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<li><p>You can fine tune your query by inserting parenthesis where needed, make parts case-sensitive or negate logical combinations by changing. e.g. "<tt>==</tt>" to "<tt>!=</tt>" for a NOT AND. All you need is a basic understanding of <a href="http://en.wikipedia.org/wiki/Regular_expression" class='external free' title="http://en.wikipedia.org/wiki/Regular expression">regular expressions</a> and maybe some scripting basics.</p></li>
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</ul>
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<h1>
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<a href="#index"><img src="../images/up.png" align="right" alt="index" border="0" width="16" height="16" /></a>
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<a id="result-window" name="result-window">The result window</a></h1>
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<p>After you start a search, the Find window will be replaced by a result window. Here is an example that queried for "server":</p>
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<img src="images/queries-images/result-window.png" alt="result-window.png" />
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<p>Besides the gray background, result windows work exactly like any other Tracker window. Some things are worth noting:</p>
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<ul>
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<li><p>You can open the folder a file resides in by double clicking on its path attribute.</p></li>
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<li><p>With <span class="menu">File | Edit Query</span> or <span class="key">ALT</span> <span class="key">G</span> you get back to your Find window to refine your query.</p></li>
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<li><p>A query is live, i.e. if a file that matches your search criteria appears or disappears from your system, this change is reflected in your results in real-time.</p></li>
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</ul>
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<p>You can assign a sensible attribute layout for query results of a specific filetype. Open a folder containing files of the filetype you'd like to create a template for and arrange the attributes how you'd like to have query results presented. Copy this layout with <span class="menu">Attributes | Copy Attributes</span>.</p>
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<p>Open <span class="path">/boot/home/config/settings/Tracker/DefaultQueryTemplates</span>, create a new folder and rename it to <i>group/filetype</i>, replacing slashes with underscores, e.g."audio_x-mp3". Open the new folder and paste in the layout with <span class="menu">Attributes | Paste Attributes</span>.</p>
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</div>
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<div class="bottomnav">
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<p>
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<a href="contents.html">Contents</a>
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Previous: <a href="index.html">Index</a>
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Next: <a href="workshop-filetypes+attributes.html">Workshop</a>
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</p>
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</div>
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</body>
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</html>
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