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<div class="section" id="module-evennia.contrib.tree_select">
<span id="evennia-contrib-tree-select"></span><h1>evennia.contrib.tree_select<a class="headerlink" href="#module-evennia.contrib.tree_select" title="Permalink to this headline"></a></h1>
<p>Easy menu selection tree</p>
<p>Contrib - Tim Ashley Jenkins 2017</p>
<p>This module allows you to create and initialize an entire branching EvMenu
instance with nothing but a multi-line string passed to one function.</p>
<p>EvMenu is incredibly powerful and flexible, but using it for simple menus
can often be fairly cumbersome - a simple menu that can branch into five
categories would require six nodes, each with options represented as a list
of dictionaries.</p>
<p>This module provides a function, init_tree_selection, which acts as a frontend
for EvMenu, dynamically sourcing the options from a multi-line string you provide.
For example, if you define a string as such:</p>
<blockquote>
<div><p>TEST_MENU = ‘’’Foo
Bar
Baz
Qux’’’</p>
</div></blockquote>
<p>And then use TEST_MENU as the ‘treestr’ source when you call init_tree_selection
on a player:</p>
<blockquote>
<div><p>init_tree_selection(TEST_MENU, caller, callback)</p>
</div></blockquote>
<p>The player will be presented with an EvMenu, like so:</p>
<blockquote>
<div><p>Foo
Bar
Baz
Qux</p>
</div></blockquote>
<p>Making a selection will pass the selection’s key to the specified callback as a
string along with the caller, as well as the index of the selection (the line number
on the source string) along with the source string for the tree itself.</p>
<p>In addition to specifying selections on the menu, you can also specify categories.
Categories are indicated by putting options below it preceded with a ‘-‘ character.
If a selection is a category, then choosing it will bring up a new menu node, prompting
the player to select between those options, or to go back to the previous menu. In
addition, categories are marked by default with a ‘[+]’ at the end of their key. Both
this marker and the option to go back can be disabled.</p>
<p>Categories can be nested in other categories as well - just go another ‘-‘ deeper. You
can do this as many times as you like. There’s no hard limit to the number of
categories you can go down.</p>
<p>For example, let’s add some more options to our menu, turning ‘Bar’ into a category.</p>
<blockquote>
<div><p>TEST_MENU = ‘’’Foo
Bar
-You’ve got to know
–When to hold em
–When to fold em
–When to walk away
Baz
Qux’’’</p>
</div></blockquote>
<p>Now when we call the menu, we can see that ‘Bar’ has become a category instead of a
selectable option.</p>
<blockquote>
<div><p>Foo
Bar [+]
Baz
Qux</p>
</div></blockquote>
<p>Note the [+] next to ‘Bar’. If we select ‘Bar’, it’ll show us the option listed under it.</p>
<blockquote>
<div><p>You’ve got to know [+]
&lt;&lt; Go Back: Return to the previous menu.</p>
</div></blockquote>
<p>Just the one option, which is a category itself, and the option to go back, which will
take us back to the previous menu. Let’s select ‘You’ve got to know’.</p>
<blockquote>
<div><p>When to hold em
When to fold em
When to walk away
&lt;&lt; Go Back: Return to the previous menu.</p>
</div></blockquote>
<p>Now we see the three options listed under it, too. We can select one of them or use ‘Go
Back’ to return to the ‘Bar’ menu we were just at before. It’s very simple to make a
branching tree of selections!</p>
<p>One last thing - you can set the descriptions for the various options simply by adding a
‘:’ character followed by the description to the option’s line. For example, let’s add a
description to ‘Baz’ in our menu:</p>
<blockquote>
<div><p>TEST_MENU = ‘’’Foo
Bar
-You’ve got to know
–When to hold em
–When to fold em
–When to walk away
Baz: Look at this one: the best option.
Qux’’’</p>
</div></blockquote>
<p>Now we see that the Baz option has a description attached that’s separate from its key:</p>
<blockquote>
<div><p>Foo
Bar [+]
Baz: Look at this one: the best option.
Qux</p>
</div></blockquote>
<p>Once the player makes a selection - let’s say, ‘Foo’ - the menu will terminate and call
your specified callback with the selection, like so:</p>
<blockquote>
<div><p>callback(caller, TEST_MENU, 0, “Foo”)</p>
</div></blockquote>
<p>The index of the selection is given along with a string containing the selection’s key.
That way, if you have two selections in the menu with the same key, you can still
differentiate between them.</p>
<p>And that’s all there is to it! For simple branching-tree selections, using this system is
much easier than manually creating EvMenu nodes. It also makes generating menus with dynamic
options much easier - since the source of the menu tree is just a string, you could easily
generate that string procedurally before passing it to the init_tree_selection function.
For example, if a player casts a spell or does an attack without specifying a target, instead
of giving them an error, you could present them with a list of valid targets to select by
generating a multi-line string of targets and passing it to init_tree_selection, with the
callable performing the maneuver once a selection is made.</p>
<p>This selection system only works for simple branching trees - doing anything really complicated
like jumping between categories or prompting for arbitrary input would still require a full
EvMenu implementation. For simple selections, however, I’m sure you will find using this function
to be much easier!</p>
<p>Included in this module is a sample menu and function which will let a player change the color
of their name - feel free to mess with it to get a feel for how this system works by importing
this module in your game’s default_cmdsets.py module and adding CmdNameColor to your default
character’s command set.</p>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.init_tree_selection">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">init_tree_selection</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">caller</span></em>, <em class="sig-param"><span class="n">callback</span></em>, <em class="sig-param"><span class="n">index</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">mark_category</span><span class="o">=</span><span class="default_value">True</span></em>, <em class="sig-param"><span class="n">go_back</span><span class="o">=</span><span class="default_value">True</span></em>, <em class="sig-param"><span class="n">cmd_on_exit</span><span class="o">=</span><span class="default_value">'look'</span></em>, <em class="sig-param"><span class="n">start_text</span><span class="o">=</span><span class="default_value">'Make your selection:'</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#init_tree_selection"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.init_tree_selection" title="Permalink to this definition"></a></dt>
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<dd><p>Prompts a player to select an option from a menu tree given as a multi-line string.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>treestr</strong> (<em>str</em>) – Multi-lne string representing menu options</p></li>
<li><p><strong>caller</strong> (<em>obj</em>) – Player to initialize the menu for</p></li>
<li><p><strong>callback</strong> (<em>callable</em>) – Function to run when a selection is made. Must take 4 args:
caller (obj): Caller given above
treestr (str): Menu tree string given above
index (int): Index of final selection
selection (str): Key of final selection</p></li>
</ul>
</dd>
</dl>
<dl class="simple">
<dt>Options:</dt><dd><p>index (int or None): Index to start the menu at, or None for top level
mark_category (bool): If True, marks categories with a [+] symbol in the menu
go_back (bool): If True, present an option to go back to previous categories
start_text (str): Text to display at the top level of the menu
cmd_on_exit(str): Command to enter when the menu exits - ‘look’ by default</p>
</dd>
</dl>
<p class="rubric">Notes</p>
<p>This function will initialize an instance of EvMenu with options generated
dynamically from the source string, and passes the menu user’s selection to
a function of your choosing. The EvMenu is made of a single, repeating node,
which will call itself over and over at different levels of the menu tree as
categories are selected.</p>
<p>Once a non-category selection is made, the user’s selection will be passed to
the given callable, both as a string and as an index number. The index is given
to ensure every selection has a unique identifier, so that selections with the
same key in different categories can be distinguished between.</p>
<p>The menus called by this function are not persistent and cannot perform
complicated tasks like prompt for arbitrary input or jump multiple category
levels at once - you’ll have to use EvMenu itself if you want to take full
advantage of its features.</p>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.dashcount">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">dashcount</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">entry</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#dashcount"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.dashcount" title="Permalink to this definition"></a></dt>
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<dd><p>Counts the number of dashes at the beginning of a string. This
is needed to determine the depth of options in categories.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>entry</strong> (<em>str</em>) – String to count the dashes at the start of</p>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><em>dashes (int)</em> – Number of dashes at the start</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.is_category">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">is_category</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">index</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#is_category"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.is_category" title="Permalink to this definition"></a></dt>
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<dd><p>Determines whether an option in a tree string is a category by
whether or not there are additional options below it.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>treestr</strong> (<em>str</em>) – Multi-line string representing menu options</p></li>
<li><p><strong>index</strong> (<em>int</em>) – Which line of the string to test</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><em>is_category (bool)</em> – Whether the option is a category</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.parse_opts">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">parse_opts</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">category_index</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#parse_opts"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.parse_opts" title="Permalink to this definition"></a></dt>
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<dd><p>Parses a tree string and given index into a list of options. If
category_index is none, returns all the options at the top level of
the menu. If category_index corresponds to a category, returns a list
of options under that category. If category_index corresponds to
an option that is not a category, it’s a selection and returns True.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>treestr</strong> (<em>str</em>) – Multi-line string representing menu options</p></li>
<li><p><strong>category_index</strong> (<em>int</em>) – Index of category or None for top level</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><p><em>kept_opts (list or True)</em> –</p>
<dl class="simple">
<dt>Either a list of options in the selected</dt><dd><p>category or True if a selection was made</p>
</dd>
</dl>
</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.index_to_selection">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">index_to_selection</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">index</span></em>, <em class="sig-param"><span class="n">desc</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#index_to_selection"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.index_to_selection" title="Permalink to this definition"></a></dt>
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<dd><p>Given a menu tree string and an index, returns the corresponding selection’s
name as a string. If ‘desc’ is set to True, will return the selection’s
description as a string instead.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>treestr</strong> (<em>str</em>) – Multi-line string representing menu options</p></li>
<li><p><strong>index</strong> (<em>int</em>) – Index to convert to selection key or description</p></li>
</ul>
</dd>
</dl>
<dl class="simple">
<dt>Options:</dt><dd><p>desc (bool): If true, returns description instead of key</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">Returns</dt>
<dd class="field-odd"><p><em>selection (str)</em> – Selection key or description if ‘desc’ is set</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.go_up_one_category">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">go_up_one_category</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">index</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#go_up_one_category"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.go_up_one_category" title="Permalink to this definition"></a></dt>
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<dd><p>Given a menu tree string and an index, returns the category that the given option
belongs to. Used for the ‘go back’ option.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>treestr</strong> (<em>str</em>) – Multi-line string representing menu options</p></li>
<li><p><strong>index</strong> (<em>int</em>) – Index to determine the parent category of</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><em>parent_category (int)</em> – Index of parent category</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.optlist_to_menuoptions">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">optlist_to_menuoptions</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">optlist</span></em>, <em class="sig-param"><span class="n">index</span></em>, <em class="sig-param"><span class="n">mark_category</span></em>, <em class="sig-param"><span class="n">go_back</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#optlist_to_menuoptions"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.optlist_to_menuoptions" title="Permalink to this definition"></a></dt>
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<dd><p>Takes a list of options processed by parse_opts and turns it into
a list/dictionary of menu options for use in menunode_treeselect.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>treestr</strong> (<em>str</em>) – Multi-line string representing menu options</p></li>
<li><p><strong>optlist</strong> (<em>list</em>) – List of options to convert to EvMenu’s option format</p></li>
<li><p><strong>index</strong> (<em>int</em>) – Index of current category</p></li>
<li><p><strong>mark_category</strong> (<em>bool</em>) – Whether or not to mark categories with [+]</p></li>
<li><p><strong>go_back</strong> (<em>bool</em>) – Whether or not to add an option to go back in the menu</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><p><em>menuoptions (list of dicts)</em> –</p>
<dl class="simple">
<dt>List of menu options formatted for use</dt><dd><p>in EvMenu, each passing a different “newindex” kwarg that changes
the menu level or makes a selection</p>
</dd>
</dl>
</p>
</dd>
</dl>
</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.menunode_treeselect">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">menunode_treeselect</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">caller</span></em>, <em class="sig-param"><span class="n">raw_string</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#menunode_treeselect"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.menunode_treeselect" title="Permalink to this definition"></a></dt>
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<dd><p>This is the repeating menu node that handles the tree selection.</p>
</dd></dl>
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<dl class="py class">
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<dt id="evennia.contrib.tree_select.CmdNameColor">
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<em class="property">class </em><code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">CmdNameColor</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#CmdNameColor"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor" title="Permalink to this definition"></a></dt>
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<dd><p>Bases: <a class="reference internal" href="evennia.commands.command.html#evennia.commands.command.Command" title="evennia.commands.command.Command"><code class="xref py py-class docutils literal notranslate"><span class="pre">evennia.commands.command.Command</span></code></a></p>
<p>Set or remove a special color on your name. Just an example for the
easy menu selection tree contrib.</p>
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<dl class="py attribute">
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<dt id="evennia.contrib.tree_select.CmdNameColor.key">
<code class="sig-name descname">key</code><em class="property"> = 'namecolor'</em><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor.key" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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<dl class="py method">
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<dt id="evennia.contrib.tree_select.CmdNameColor.func">
<code class="sig-name descname">func</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#CmdNameColor.func"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor.func" title="Permalink to this definition"></a></dt>
<dd><p>This is the actual executing part of the command. It is
called directly after self.parse(). See the docstring of this
module for which object properties are available (beyond those
set in self.parse())</p>
</dd></dl>
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<dl class="py attribute">
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<dt id="evennia.contrib.tree_select.CmdNameColor.aliases">
<code class="sig-name descname">aliases</code><em class="property"> = []</em><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor.aliases" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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<dl class="py attribute">
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<dt id="evennia.contrib.tree_select.CmdNameColor.help_category">
<code class="sig-name descname">help_category</code><em class="property"> = 'general'</em><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor.help_category" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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<dl class="py attribute">
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<dt id="evennia.contrib.tree_select.CmdNameColor.lock_storage">
<code class="sig-name descname">lock_storage</code><em class="property"> = 'cmd:all();'</em><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor.lock_storage" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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<dl class="py attribute">
<dt id="evennia.contrib.tree_select.CmdNameColor.search_index_entry">
<code class="sig-name descname">search_index_entry</code><em class="property"> = {'aliases': '', 'category': 'general', 'key': 'namecolor', 'tags': '', 'text': '\n Set or remove a special color on your name. Just an example for the\n easy menu selection tree contrib.\n '}</em><a class="headerlink" href="#evennia.contrib.tree_select.CmdNameColor.search_index_entry" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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</dd></dl>
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<dl class="py function">
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<dt id="evennia.contrib.tree_select.change_name_color">
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<code class="sig-prename descclassname">evennia.contrib.tree_select.</code><code class="sig-name descname">change_name_color</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">caller</span></em>, <em class="sig-param"><span class="n">treestr</span></em>, <em class="sig-param"><span class="n">index</span></em>, <em class="sig-param"><span class="n">selection</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/evennia/contrib/tree_select.html#change_name_color"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#evennia.contrib.tree_select.change_name_color" title="Permalink to this definition"></a></dt>
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<dd><p>Changes a player’s name color.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>caller</strong> (<em>obj</em>) – Character whose name to color.</p></li>
<li><p><strong>treestr</strong> (<em>str</em>) – String for the color change menu - unused</p></li>
<li><p><strong>index</strong> (<em>int</em>) – Index of menu selection - unused</p></li>
<li><p><strong>selection</strong> (<em>str</em>) – Selection made from the name color menu - used
to determine the color the player chose.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
</div>
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