mjhjmtu

I have a string like: func showFetchNextSliceFailed(result: UserResult<[Product]>) {

From this, I would like to 1). extract just showFetchNextSliceFailed 2). Insert it right above the given line, as #Mark showFetchNextSliceFailed.

 func showProductsList(result: UserResult<[Product]>) 

 

 func showFetchNextSliceFailed(result: UserResult<[Product]>) 

 

Expected output:

 #Mark showProductsList
 func showProductsList(result: UserResult<[Product]>) 

 

 #Mark showFetchNextSliceFailed
 func showFetchNextSliceFailed(result: UserResult<[Product]>) 

 

I tried with grep and sed, but still can't figure out correctly how to extract and replace strings.

With sed

• copy the matching pattern space to hold space


• modify the pattern space


• recover the original from hold space and append it

Ex.

$ sed '/func show/ h; s/func (show[^(]*).*/#Mark 1/; G;' file
 #Mark showProductsList
 func showProductsList(result: UserResult<[Product]>) 

 

 #Mark showFetchNextSliceFailed
 func showFetchNextSliceFailed(result: UserResult<[Product]>) 

 

If you have the following code file:

INPUT:

 $more code
 func showProductsList(result: UserResult<[Product]>) 

 

 func showFetchNextSliceFailed(result: UserResult<[Product]>) 

 

COMMAND:

perl -i.bak -pe "s/^^( *|t*)funcs(w+)funcs(w+)/1#Mark 2n1func 2/g" code

OUTPUT:

 #Mark showProductsList
 func showProductsList(result: UserResult<[Product]>) 

 

 #Mark showFetchNextSliceFailed
 func showFetchNextSliceFailed(result: UserResult<[Product]>) 

 

EXPLANATIONS:

• 
  -i.bak in-place mode for perl with backup of the input file


• 
  s/^( *|t*)funcs(w+)funcs(w+)/1#Mark 2n1func 2/g find and replace mode detailed at demo