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Full Discussion: Diff script for 2 files.
Top Forums UNIX for Dummies Questions & Answers Diff script for 2 files. Post 302289670 by bishnu.bhatta on Friday 20th of February 2009 07:46:30 AM
Old 02-20-2009
Diff script for 2 files.

Hi all,

I am stuck up in middle of a process.
I have 2 files A and B.
Some lines in A are commented with either // or /* */

But basically content (uncommented portion) of both the files are same.

Now I want to prove that both the files are same using some script.

I can't do a diff as it will give me commented lines as difference.
I thought of an algo for this:

1.Format both the files to remove leading and trailing blank spaces,append some char(~~~) to mark \n.
Do the following(Step 2-4) for both the files
2.Create only valid fields file by removing /**/ and //
2.1.Put all characters in array
2.2.Read a char and check if it is / If YES go to 2.3 else go to step 3
2.3.If YES, then check the next char to be / or *
2.4.If next char is * then Create a REJECT array and store the chars till */ is encountered
2.5.If next char is / then Create a REJECT array and store the chars till \n in encountered
3.Put all valid fields in VALID array
4.Reconstruct the file with elements from VALID array(thats why I had used the indicator "~~~")
5.Do diff for both files now

Till step 2.1 I am done.but I am now confused Smilie with step 2.3

Any other alternative ideas welcomed.
 

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GIT-STRIPSPACE(1)						    Git Manual							 GIT-STRIPSPACE(1)

NAME
git-stripspace - Remove unnecessary whitespace SYNOPSIS
git stripspace [-s | --strip-comments] git stripspace [-c | --comment-lines] DESCRIPTION
Read text, such as commit messages, notes, tags and branch descriptions, from the standard input and clean it in the manner used by Git. With no arguments, this will: o remove trailing whitespace from all lines o collapse multiple consecutive empty lines into one empty line o remove empty lines from the beginning and end of the input o add a missing to the last line if necessary. In the case where the input consists entirely of whitespace characters, no output will be produced. NOTE: This is intended for cleaning metadata, prefer the --whitespace=fix mode of git-apply(1) for correcting whitespace of patches or files in the repository. OPTIONS
-s, --strip-comments Skip and remove all lines starting with comment character (default #). -c, --comment-lines Prepend comment character and blank to each line. Lines will automatically be terminated with a newline. On empty lines, only the comment character will be prepended. EXAMPLES
Given the following noisy input with $ indicating the end of a line: |A brief introduction $ | $ |$ |A new paragraph$ |# with a commented-out line $ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out. $ | $ |The end.$ | $ Use git stripspace with no arguments to obtain: |A brief introduction$ |$ |A new paragraph$ |# with a commented-out line$ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out.$ |$ |The end.$ Use git stripspace --strip-comments to obtain: |A brief introduction$ |$ |A new paragraph$ |explaining lots of stuff.$ |$ |The end.$ GIT
Part of the git(1) suite Git 2.17.1 10/05/2018 GIT-STRIPSPACE(1)
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