[bug#44821] [PATCH v3] gnu: Add diff-so-fancy.

[Leo Famulari]

On Fri, Dec 04, 2020 at 05:08:27PM -0300, EuAndreh wrote:
> * gnu/packages/version-control.scm (diff-so-fancy): New variable.
> ---
> Fixed the unnecessary propagated input as suggested.

Thanks!

> +    (arguments
> +     '(#:phases
> +       (modify-phases %standard-phases
> +         (add-after 'install 'symlink-executable
> +           (lambda* (#:key outputs inputs #:allow-other-keys)
> +             (let ((out (assoc-ref outputs "out"))
> +                   (ncurses (assoc-ref inputs "ncurses"))
> +                   (perl (assoc-ref inputs "perl")))
> +               (mkdir (string-append out "/bin"))
> +               ;; diff-so-fancy looks for lib/ under the directory
> +               ;; it is in

I should have noticed it sooner but I think it's better to adjust how
diff-so-fancy finds the library than to work around this unusual
expectation.

I attached a revised patch that does this. Can you test if it works for
you?

It simplifies the symlink-executable phase, adds a patch-lib-path phase,
and adjusts the install-plan accordingly.

If it works then we should be done!

0001-gnu-Add-diff-so-fancy.patch
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