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POTab Vs Space preferences in Vim
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copied!<p>Vim is very accommodating when it comes to tab Vs. space preferences. As I understand it, the <code>tabstop</code> setting indicates the width of a tab character. The <code>shiftwidth</code> setting specifies how many columns to increment/decrement when using the <kbd><<</kbd> and <kbd>>></kbd> commands, whereas the <code>softtabstop</code> setting influences the amount of whitespace to be inserted when you press the <kbd>Tab</kbd> key in insert mode. If <code>expandtab</code> is on, the tab key inserts <code>softtabstop</code> number of space characters. Whereas with <code>expandtab</code> switched off, pressing the <kbd>Tab</kbd> key inserts a the smallest possible number of tab+space characters that matches <code>softtabstop</code>. (Please correct me if I'm wrong.)</p> <p>This final point makes me wonder: is there a practical case where you wouldn't want <code>shiftwidth == tabstop && tabstop == softtabstop</code>? I can't think of one. As far as I am concerned, it would be most convenient if I could set all 3 of these to the same value, in one single assignment. e.g. calling:</p> <pre><code>:set stab=4 </code></pre> <p>which would be equivalent to running:</p> <pre><code>:set tabstop=4 softtabstop=4 shiftwidth=4 </code></pre> <p>Can anyone suggest how this could be done?</p> <hr> <h2><em>UPDATE</em></h2> <p><strong>Thanks for the replies so far from <em>too much php</em>, <em>hobbs</em> and <em>kaiser.se</em>. Rather than reply to each individually, I'm updating the question here.</strong></p> <h2>Softtabstop with expandtab switched off</h2> <p>I said above that with expandtab switched off, pressing the Tab key inserts a the smallest possible number of tab+space characters that matches <code>softtabstop</code>. I stand by that, but I think I need to explain what I meant. I shall attempt to do so by way of a few examples. To follow along, run <code>:set list</code> so that you can see tab characters.</p> <p><code>tabstop=4 softtabstop=2 shiftwidth=4 noexpandtab</code></p> <p>In insert mode, pressing the tab key inserts 2 space characters. Press the tab key a second time, and instead of inserting two more space characters (for a total of 4 space characters) it replaces the previous 2 spaces with a single tab character. Tabstop is set to 4, so a single tab character has the same width as 4 spaces. </p> <p><code>tabstop=4 softtabstop=6 shiftwidth=4 noexpandtab</code></p> <p>In insert mode, pressing the tab key inserts 1 tab character plus 2 spaces. The tab character has a width of 4, so the total width is 6, and this is achieved using 3 characters. Pressing the tab key a second time inserts two tab characters, and removes the two spaces that were inserted previously. The total width is 12, and this is achieved using 3 characters.</p> <p>In both of these examples, Vim inserts the minimum possible number of tab+space characters that matches softtabstop. </p> <p>If I am working with expandtab switched off, I can't see myself wanting the extra granular control that can be achieved by setting softtabstop to a different value from tabstop. It would still be useful for me to be able to set <code>tabstop</code>, <code>softtabstop</code> and <code>shiftwidth</code> to the same value with a single command.</p> <h2>Does expandtab make softtabstop redundant?</h2> <p><code>tabstop=4 softtabstop=0 shiftwidth=4 expandtab</code></p> <p>In insert mode, pressing the tab key inserts 4 spaces. Pressing the delete key deletes a single space - so you have to backspace 4 times if you hit the tab key by accident.</p> <p><code>tabstop=4 softtabstop=4 shiftwidth=4 expandtab</code></p> <p>In insert mode, pressing the tab key inserts 4 spaces. Pressing the backspace key deletes 4 spaces.</p> <p>If I am working with <code>expandtab</code> switched on, I would prefer the delete key to remove the same amount of whitespace as the tab key inserts. So in this case, too, I feel that it would be useful to be able to assign the same value to <code>tabstop</code>, <code>softtabstop</code> and <code>shiftwidth</code> simultaneously.</p> <h2>A shortcut would still be useful</h2> <p>It's great that Vim provides so much flexibility, but I can't see myself needing it. I just want to be able to choose the width of a tab, and whether it is a 'hard' tab (using a tab character) or a 'soft' tab (made up of spaces). Toggling between hard and soft tabs is easy enough (<code>:set expandtab!</code>), but I wish it was more straightforward to set the width of tab, without having to fiddle with 3 different parameters. </p> <p>So my proposed suggestion for something like <code>:set stab=4</code> still sounds good to me.</p>

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