setter and getter functions for file manipulation with sed Post: 302602895

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Top Forums Shell Programming and Scripting setter and getter functions for file manipulation with sed Post 302602895 by Corona688 on Tuesday 28th of February 2012 04:39:27 PM

02-28-2012

Registered User

Quote:

Originally Posted by Toorop

First of all, thanks a lot.

Hopefully, there's no misunderstanding between us, since I still don't know why the original task is much easier.

// No comments.

No /* multi-line comments. */

No { code blocks. }

No "strings".

Your code only might work under very particular circumstances, can't tell code blocks apart from each other, and may edit the heck out of the comments by accident.

I can give you something to do a specific task easily. You wanted something general, and that's hard.

This is why I asked what you actually wanted to do, not what manner you wanted to accomplish it in. Replacing values is easy enough. Giving you 'getters' and 'setters' so you can replace in exactly the manner you think you should isn't.

---------- Post updated at 03:39 PM ---------- Previous update was at 02:59 PM ----------

I still can't handle multi-line comments, so you'd better hope the variable names never show up in comments. But:

Code:

#!/bin/bash
cp data data-backup

awk 'function get(N)
{
        split(LINE[VAR[N]], A);
        sub(/;$/, "", A[2]);
        return(A[2]);
}

function set(N,V)
{
        if(!VAR[N])
        {
                LINE[++C]=N "\t" V ";"
                VAR[N]=C;
        }
        else
        {
                $0=LINE[VAR[N]];
                $2=V ";"
                LINE[VAR[N]]=$0
        }
}

/{/ && LL       {       PP[++L]=VP;     VP=VP LL "."    }
/}/             {       VP=PP[L--];                     }

{       LL=$0;  NAME=""; VALUE="";      LINE[++C]=$0     }

(NF==2) && /;$/ {       VAR[VP $1]=NR   }

END {
        set("FoamFile.version", "3.0");
        set("newvalue", "slartibartfast");
        for(N=1; N<=C; N++)    print LINE[N];
}' data-backup > data

Edit the part in red to your heart's content.

Last edited by Corona688; 02-28-2012 at 05:11 PM..

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git-var

GIT-VAR(1)							    Git Manual								GIT-VAR(1)

NAME

       git-var - Show a git logical variable

SYNOPSIS

       git var ( -l | <variable> )

DESCRIPTION

       Prints a git logical variable.

OPTIONS

       -l
	   Cause the logical variables to be listed. In addition, all the variables of the git configuration file .git/config are listed as well.
	   (However, the configuration variables listing functionality is deprecated in favor of git config -l.)

EXAMPLE

	   $ git var GIT_AUTHOR_IDENT
	   Eric W. Biederman <ebiederm@lnxi.com> 1121223278 -0600

VARIABLES

       GIT_AUTHOR_IDENT
	   The author of a piece of code.

       GIT_COMMITTER_IDENT
	   The person who put a piece of code into git.

       GIT_EDITOR
	   Text editor for use by git commands. The value is meant to be interpreted by the shell when it is used. Examples: ~/bin/vi,
	   $SOME_ENVIRONMENT_VARIABLE, "C:Program FilesVimgvim.exe" --nofork. The order of preference is the $GIT_EDITOR environment variable,
	   then core.editor configuration, then $VISUAL, then $EDITOR, and then finally vi.

       GIT_PAGER
	   Text viewer for use by git commands (e.g., less). The value is meant to be interpreted by the shell. The order of preference is the
	   $GIT_PAGER environment variable, then core.pager configuration, then $PAGER, and then finally less.

DIAGNOSTICS

       You don't exist. Go away!
	   The passwd(5) gecos field couldn't be read

       Your parents must have hated you!
	   The passwd(5) gecos field is longer than a giant static buffer.

       Your sysadmin must hate you!
	   The passwd(5) name field is longer than a giant static buffer.

SEE ALSO

       git-commit-tree(1) git-tag(1) git-config(1)

GIT

       Part of the git(1) suite

Git 1.7.10.4							    11/24/2012								GIT-VAR(1)