如何使用bash将多行合并为一行？

Question

So I have code that looks like this:

else if(between(pay,1260,1280))
{
    return 159;
}
else if(between(pay,1280,1300))
{
    return 162;
}
else if(between(pay,1300,1320))
{
    return 165;
}

But I want it to look like this:

else if(between(pay,1260,1280)){return 159;}
else if(between(pay,1280,1300)){return 162;}
else if(between(pay,1300,1320)){return 165;}

Can I do this in bash? If not, which language can I use?

The full code is over 30,000 lines and I could manually do it, but I know there's a better way. I want to say the 'sed' command can help me with a mixture of regex, but that's as far as my knowledge can take me.

PS Please overlook how un-optimized it is just this once.

Answer 1

This might work for you (GNU sed):

sed '/^else/{:a;N;/^}/M!ba;s/\n\s*//g}' file

Gather up the required lines in the pattern space and remove all newlines and following spaces on encountering the end marker ie a line beginning } .

Answer 2

Following awk may also help you in same.

awk -v RS="" '{
$1=$1;
gsub(/ { /,"{");
gsub(/ }/,"}");
gsub(/}/,"&\n");
gsub(/ else/,"else");
sub(/\n$/,"")
}
1
'  Input_file

Output will be as follows.

else if(between(pay,1260,1280)){return 159;}
else if(between(pay,1280,1300)){return 162;}
else if(between(pay,1300,1320)){return 165;}

EDIT: Adding explanation for solution too now.

awk -v RS="" '{      ##Making RS(record separator) as NULL here.
$1=$1;               ##re-creating first field to remove new lines or space.
gsub(/ { /,"{");     ##globally substituting space { with only { here.
gsub(/ }/,"}");      ##globally substituting space } with only } here.
gsub(/}/,"&\n");     ##globally substituting } with } and new line here.
gsub(/ else/,"else");##globally substituting space else with only else here.
sub(/\n$/,"")        ##substituting new line at last of line with NULL.
}
1                    ##motioning 1 here as awk works on method of condition and action.
                     ##So here I am making condition as TRUE and then not mentioning any action so be default print of current line will happen.
'  Input_file