Re: diff and patch

Mark Summerfield <m.n.summerfield@gmail.com> wrote:

I want these functions:
 
    proc diff {old new} -> # diff data "ddata"
    proc patch {old ddata} -> # new
 
where old and new are strings.
 
I thought the Tcllib's rcs module could do this but I can't figure it out.
 
Is this possible using the rcs module or using the struct::list module's
LCS functions?

The core of the diff algorithm is LCS.  You want the LCS functions from
struct::list.

But, you don't get a "diff" from the LCS procs, you get the LCS data,
you then have to convert that into a "diff" format of your choice.

You likely want to look at the various "diff in tcl" pages on the wiki. 
A starting point: https://wiki.tcl-lang.org/page/diff+in+Tcl