From: Sebastian Schuberth <sschuberth@gmail.com>
Date: Wed, 13 May 2015 20:36:15 GMT
Subject: Re: [PATCH v2] mergetools: add winmerge as a builtin tool
Message-ID: <5553B5BF.7040408@gmail.com>
In-Reply-To: <5553AD43.9010807@gmail.com>

On 13.05.2015 22:00, Sebastian Schuberth wrote:

> So how about something like this which hopefully covers all cases (including case-sensitivity issues regarding environment variable names and the problem of querying a variable that contains parentheses as part of its name):
> 
> for directory in "$(env | sed -nr 's/^PROGRAM(FILES(\(X86\))?|W6432)=//pI')"
> do
>      test -n "$directory" &&
>      test -x "$directory/$winmerge_exe" &&
>      echo "$directory/$winmerge_exe" &&
>      break
> done
> 
> sed's "I" seems to be a GNU extension that's not available with OS X' BSD sed. This shouldn't be an issue as WinMerge is Windows only anyway. If it still turns out to be an issue we probably should come up with an equivalent Perl expression.

Or even better, as that does not rely on GNU sed, sorts matches so that "C:\Program Files" for sure comes before "C:\Program Files (x86)" and removes any duplicates:

for directory in "$(env | grep -E '^PROGRAM(FILES(\(X86\))?|W6432)=' | cut -d '=' -f 2 | sort -u)"
do
     test -n "$directory" &&
     test -x "$directory/$winmerge_exe" &&
     echo "$directory/$winmerge_exe" &&
     break
done

-- 
Sebastian Schuberth