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Full Discussion: Portable and efficient way to add text after pattern
Top Forums Shell Programming and Scripting Portable and efficient way to add text after pattern Post 303019148 by SkySmart on Sunday 24th of June 2018 02:03:56 AM
Old 06-24-2018
Portable and efficient way to add text after pattern
Shell: sh/bash
OS: Linux (all unix flavors)

Suppose i have a variable with this content:

Code:
ArgZ='
import os
import sys
MySpecialpath = os.path.abspath(sys.argv[0])
#
'
ArgZB='#REGEN
#REGEN
#REGEN
'

I want to add this text to a file/script, only under the following conditions:

1. First, scan the file/script and verify that the first 2 lines of the ArgZ variable dont already exist in it. Meaning, make sure the exact patterns of "^import os$" and "^import sys$" aren't anywhere in the script. If they are, remove them.

2. Add the content of ArgZ and ArgZB only after the last line in the file/script that begins with an "import".

3. If there are no lines in the file/script that has an import, add the content of ArgZ and ArgZB to the top of the file/script right under the "#\!" line.

4. If a "#!" line does not exist, simply add the content of ArgZ and ArgZB to the top of the file/script.

So for example, if i have a file/script like the below:

Code:
#!/usr/bin/env python2.7

import sys
import time
import re
import os.path
from bisect import bisect_left

the code i'm looking for should make the output look like this:


Code:
#!/usr/bin/env python2.7

import os
import sys
MySpecialpath = os.path.abspath(sys.argv[0])
#
#REGEN
#REGEN
#REGEN
from bisect import bisect_left

or like this:

Code:
import os
import sys
MySpecialpath = os.path.abspath(sys.argv[0])
#
#REGEN
#REGEN
#REGEN
from bisect import bisect_left

what i was doing was greatly inefficient:

Code:
TheScript=$(cat file/script)
printf '%s\n' "${ArgsZ}""${ArgsZB}""${TheScript}"

There's no logic here and im just adding the content to the beginning of the file/script. I want some logic applied to this.
 

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LEARN ABOUT DEBIAN

rant-import

rant-import(1)							    rant-import 						    rant-import(1)

NAME

       Rant - Flexible, Ruby based make

SYNOPSIS

       The  rant-import  command creates a monolithic rant script tailored to the needs of your project and thus removes the dependency on an Rant
       installation (but of course one person needs an Rant installation to run rant-import).

       Run the command with the --help option to get a brief help message:

	   % rant-import --help

       Probably the easiest way to create your monolithic rant script is with the --auto option:

	   % rant-import --auto ant

       This will write a monolithic rant script to the file ant in the current directory. To determine which plugins and imports your  project	is
       using,  it  performs step 2 of the rant command as described in doc/rant.rdoc, which means that it loads the Rantfile in the current direc-
       tory.

       That one command should be enough:

	   % ruby ant

       This script has the same behaviour as the rant command. Distribute it with your project and nobody else but you needs an Rant installation.

FURTHER INFORMATION

       For more information on Rant see: <http://make.rubyforge.org/>

       <http://make.rubyforge.org/files/doc/rant-import_rdoc.html>

AUTHOR

       Rant is by Stefan Lang

       This package is maintained by Ralph Amissah

SEE

       rant(1)

version 0.5.6							   July 26, 2006						    rant-import(1)
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