Uncrustify - How do I align trailing comments by two-space gap?

Question

After I applied Atom Beautify on my code using Uncrustify, the trailing comments are aligned as follow:

unsigned int redLEDValue      = 0; // redLED
unsigned int blueLEDValue     = 0; // blueLED
unsigned int greenLEDValue    = 0; // greenLED
unsigned int redSensorValue   = 0; // redSensor
unsigned int blueSensorValue  = 0; // blueSensor
unsigned int greenSensorValue = 0; // greenSensor

There is only once space between the semicolon and the trailing comment, but I want to have at least 2 spaces between them. I'm using Atom 1.12.9, Atom Beautify 0.29.16, and Uncrustify 0.64. Here is my Uncrustify config.

Is there any way to increase the gap? I've already set align_right_cmt_span = 4 but no hope. Thanks in advance.

Answer 1

You have to enable adding spaces first with the option:

sp_before_tr_emb_cmt            = add

sp_before_tr_emb_cmt: Controls the spaces before a trailing or embedded comment

Than you can adjust the amount of spaces with:

sp_num_before_tr_emb_cmt        = 2

sp_num_before_tr_emb_cmt: Number of spaces before a trailing or embedded comment

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Edit:

Uncrustify has also an aligning function for trailing comments which is applied after the spacing functionalities. The aligning function is controlled by those three options:

align_right_cmt_span            = 1        # unsigned number

The span for aligning comments that end lines (0=don't align)

 

align_right_cmt_gap             = 10       # number

If a trailing comment is more than this number of columns away from the text it follows, it will qualify for being aligned. This has to be > 0 to do anything. A negative value [will] force comments which are stuck to the previous token (gap=0) into alignment with the others.

 

align_right_cmt_at_col          = 80       # unsigned number

Align trailing comment at or beyond column N; 'pulls in' comments as a bonus side effect (0=ignore)

Note:

• The functionality is enabled if align_right_cmt_span is greater than 0.
• Contrary to its description align_right_cmt_gap is enabled if it is 0. All numeric options are initially set to 0 as default values.
• If align_right_cmt_at_col is less than the column of the last char before the beginning of the comment the comment will be indented to one space after the last char.