Make vim indent C preprocessor directives the same as other statements

Question

General info (Note: Please read this all the way through, because I spent a bit of time organizing it, making sure I addressed each individual problem I'm having and why one proposed solution doesn't work for me.) I'm using cindent in vim to automagically do indentation. It works great most of the time. However, cindent does three Bad Things (in my opinion) involving C preprocessor directives (statements starting with a hash ('#')). In case it's relevant, I use tabs for indentation, and I my .vimrc contains `filetype indent on`. Bad Thing 1 As soon as I type a preprocessor directive, vim puts it in column 1 (it completely un-indents it). For example, here's what vim does to my code as I type it: ``` int main(void) { while(1) { /* normal things */ #ifdef DEBUG printDebugInfo(); #endif /* normal things */ } } ``` However, I want it look like this: ``` int main(void) { while(1) { /* normal things */ #ifdef DEBUG printDebugInfo(); #endif /* normal things */ } } ``` In other words, I'd pre…

Accepted Answer

From the Vim documentation, under cinoptions:

Vim puts a line in column 1 if:

- It starts with '#' (preprocessor directives), if 'cinkeys' contains '#'.

- It starts with a label (a keyword followed by ':', other than "case" and "default") and 'cinoptions' does not contain an 'L' entry with a positive value.

- Any combination of indentations causes the line to have less than 0 indentation.

So, removing `0#` from `cinkeys` should override that default behavior. (This idea turns up in enough places on the interwebs.)

```
set cinkeys=0{,0},0),:,!^F,o,O,e
```

With that change to cinkeys, here's what I got, exactly what you're looking for:

```
int main(void)
{
    while(1) {
        /* normal things */
        #ifdef DEBUG
        printDebugInfo();
        #endif
        /* normal things */
    }
}
```

Make vim indent C preprocessor directives the same as other statements

Solution

Problem

Related problems