Filling text with fixed column width.

polch · 08-31-2011, 02:34 AM

Hi.

I'm working on the integration of the sozi player (http://sozi.baierouge.fr/wiki/en:welcome) in dia (http://live.gnome.org/Dia).

The sozi player consist in appending java scripts and a style sheet in a svg doc. The set of java scripts are minified and raw copied in the svg.

For the dia integration i put the raw minified java scripts in a const string.

My problem is that i would like to split the long string on multiple lines. For example

Code:

char* sozi_script = "A_long_javascript_code_of_more_than_2000_chars";

would become

Code:

char* sozi_script = 
"A_long_javascript_"
"code_of_more_than_"
"2000_chars";

I've tried the "--line-break" option of the minifier (yuicompressor), the pr , the fold and the fmt command line. But in either case i will need to add the quote at the end and the beginning of the lines (so use sed or awk).

So i wonder if i could fill and format with sed only. I also would like to cut the text every 40 char for example in order to have every lines of the same length.

If someone has an idea, i would be pleased to learn it.

Thank you.

Paul.

Kenhelm · 08-31-2011, 11:37 PM

This uses GNU sed.
'18' is the maximum number of characters which can be inside the quotes.

Code:

sed -r '/char\* sozi_script = /{
s/= /=\n/
:a
s/(.*\n".{18})([^"])/\1"\n"\2/
ta
}' file

char* sozi_script =
"A_long_javascript_"
"code_of_more_than_"
"2000_chars";

If the last line has the maximum number of characters then the semi-colon is appended to it rather than being put on the next line.

Code:

sed -r '/char\* sozi_script = /{
s/= /=\n/
:a
s/(.*\n".{23})([^"])/\1"\n"\2/
ta
}' file

char* sozi_script =
"A_long_javascript_code_"
"of_more_than_2000_chars";

polch · 09-02-2011, 10:34 AM

Thank you for those solutions.