Capturing specific sections from a file

Faki · 11-02-2021, 01:39 AM

I have another adaptation

Code:

capture-org ()
{
 local efile="$1"
 awk '/## mode/{flag=1;next} /## # End/{flag=0} flag' "$efile" |
  tr -d /#/ | awk '$1=$1'
}

But I am getting more lines being printed when I pass the same file where I have the code and thus the function `capture-org`. This is because the script gets a match with `## mode` in the code part (i.e. the matches are matching occurrence anywhere on the line).

I need to match exactly as with the patterns ^[[:space:]]*## mode: org$ and ^[[:space:]]*## # End of org$

Faki · 11-02-2021, 02:30 AM

I need to match the exact patterns '^[[:space:]]*## mode: org$' and '^[[:space:]]*## # End of org$', rather than matching anywhere in the lines.

Turbocapitalist · 11-02-2021, 03:09 AM

AWK statements are just if-then clauses written in a compact manner with several built-in abbreviations.

If you write what you have a little differently,

Code:

capture-org ()
{
 local efile="$1"
 awk  '/## mode/ { flag=1; next } 
       /## # End/ { flag=0; } 
       flag { sub(/^[[:space:]]*#[[:space:]]*/,"); print }' \
       "$efile"'
}

then can you spot where the new patterns go?

Faki · 11-02-2021, 05:57 AM

Have made these changes.

Code:

  
awk '/^[[:space:]]*## mode: rec$/    { flag=1; next } 
     /^[[:space:]]*## # End of rec$/ { flag=0; } 
     flag { sub(/^[[:space:]]*#[[:space:]]*/,""); print }' "$efile"

But I am getting the following but need the starting "# " removed.

Code:

# HDG: Handling function argument parsing with getopts
# Rmk: No call to {shift} is required with getopts
# Rmk: No hyphen {-} required when searching option names
# + Case patterns do not start with option hyphen {-} because
# + getopts strips off the hyphen and makes the value of {arg}
# + to be just the option letter.
# Rmk: Separating options from non-options with --
# + {getopts} stops processing options when the argument is not
# + defined as an option in {shortopts}; or if the argument is
# + "--", which explicitly terminates the list of options.
# Rmk: Using -- as value to an option
# + An option value can be -- without it being considered a
# + separator between options and non-options.
# + Example { edvart-getopts -g "--" }.
# Rmk: Explicitly testing for {--}
# + There is no need to test for {--} when using {getopts}.
# HDG: Silent Error Reporting Mode (SERM) in getopts
# Rmk: Detects warnings without printing built-in messages.
# Rmk: Enabled by colon {:} as first character in shortopts.

pan64 · 11-02-2021, 06:07 AM

ok, so you need to formulate that sub command (or use more than one) to remove unwanted parts of the line.

Faki · 11-02-2021, 06:28 AM

Disregard

Turbocapitalist · 11-02-2021, 06:32 AM

You're close. The method for that is a little non-obvious:

Code:

 
 begrec='^[[:space:]]*## mode: rec$'
 endrec='^[[:space:]]*## # End of rec$'
 awk -v begr="$begrec" -v endr="$endrec" \
   '$0~begr { flag=1; next } 
    $0~endr { flag=0; } 
    flag { sub(/^[[:space:]]*#[[:space:]]*/,""); print }' "$efile"

That comes down to the shortcuts and abbreviations that AWK allows. The short annotation for $0~/foo/ is simply /foo/. Be sure to check the reference manual for the AWK scripting language periodically during this task: "man awk"

See also : https://www.grymoire.com/Unix/Awk.html