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With the option ‘-ln’, or ‘--line-lengthn’, it is possible to specify the maximum length of a line of C code, not including possible comments that follow it.
When lines become longer than the specified line length, GNU indent
tries to break the line at a logical place. This is new as of version 2.1
however and not very intelligent or flexible yet.
Currently there are two options that allow one to interfere with the algorithm that determines where to break a line.
The ‘-bbo’ option causes GNU indent
to prefer to break
long lines before the boolean operators &&
and ||
. The
‘-nbbo’ option causes GNU indent
not have that
preference. For example, the default option ‘-bbo’ (together
with ‘--line-length60’ and ‘--ignore-newlines’) makes code
look like this:
if (mask && ((mask[0] == '\0') || (mask[1] == '\0' && ((mask[0] == '0') || (mask[0] == '*'))))) |
Using the option ‘-nbbo’ will make it look like this:
if (mask && ((mask[0] == '\0') || (mask[1] == '\0' && ((mask[0] == '0') || (mask[0] == '*'))))) |
The default ‘-hnl’, however, honours newlines in the input file by giving them the highest possible priority to break lines at. For example, when the input file looks like this:
if (mask && ((mask[0] == '\0') || (mask[1] == '\0' && ((mask[0] == '0') || (mask[0] == '*'))))) |
then using the option ‘-hnl’, or ‘--honour-newlines’, together with the previously mentioned ‘-nbbo’ and ‘--line-length60’, will cause the output not to be what is given in the last example but instead will prefer to break at the positions where the code was broken in the input file:
if (mask && ((mask[0] == '\0') || (mask[1] == '\0' && ((mask[0] == '0') || (mask[0] == '*'))))) |
The idea behind this option is that lines which are too long, but are already
broken up, will not be touched by GNU indent
. Really messy code
should be run through indent
at least once using the
‘--ignore-newlines’ option though.
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