Append to the previous line for a match

Question

can I use sed or awk to append to the previous line if a match is found ?

I have a file which has the format :

          INT32         


        

Answer 1

One way using awk:

awk '!(NF == 1 && $1 == "{") { if (line) print line; line = $0; next; } { sub(/^[ \t]+/, "", $0); line = line $0; } END { print line }' file.txt

Or broken out on multiple lines:

!(NF == 1 && $1 == "{") { 
    if (line) print line
    line = $0
    next
}

{
    sub(/^[ \t]+/, "", $0)
    line = line $0
}

END {
    print line
}

Results:

INT32
          FSHL (const TP  Buffer){
          INT32
          FSHL_lm (const TP  Buffer) 
          { WORD32 ugo = 0; ...

HTH