Sounds like you need https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L108-L116
On Tue, Sep 13, 2016 at 10:04 AM, Matthew O'Gorman <[email protected]> wrote: > Hi I am working on a package and wanted to know the bet way to achieve > this. i have an env variable like this > > huginnEnv = { > GEM_HOME = gemHome; > BUNDLE_GEMFILE = "${cfg.packages.huginn}/share/huginn/Gemfile"; > UNICORN_PATH = "${cfg.statePath}/"; > HUGINN_PATH = "${cfg.packages.huginn}/share/huginn/"; > HUGINN_STATE_PATH = "${cfg.statePath}"; > HUGINN_UPLOADS_PATH = "${cfg.statePath}/uploads"; > HUGINN_LOG_PATH = "${cfg.statePath}/log/huginn.log"; > RAILS_ENV = "production"; > LD_LIBRARY_PATH = "${pkgs.curl.out}/lib:${pkgs.postgresql}/lib"; > DATABASE_ADAPTER = "postgresql"; > RAILS_SERVE_STATIC_FILES = (if serve_static_files then "true" else ""); > # I set this by hand because I wanted to maintain sessions between > restarts. > #I totally know what I am doing security wise. > APP_SECRET_TOKEN=(if cfg.app_secret_token != "random" then > cfg.app_secert_token else ""); > DOMAIN=(if !cfg.enableUnicorn then cfg.host else ""); > PORT=(if !cfg.enableUnicorn then toString cfg.port else ""); > }; > > I would like to take huginnEnv but prune out any of the Null results, > "", so that I only set real variables no blank ones. is there a way to > filter on this? or mapttrs to list filter and then list to attrs is the > simplest way? > > thanks > > -- > Matthew O'Gorman > BM-NBUmia4p88Jny5bZbRGcMt64SWWp5WVv > TorChat: 5w3dtk7nhkkijcpc > Site: https://b.rldn.net > Xim/Email: [email protected] > mog@rldn:~$ fortune wisdom -s|cowsay -f /dev/null > _______________________________________ > / You will always find something in the \ > \ last place you look. / > --------------------------------------- > > _______________________________________________ > nix-dev mailing list > [email protected] > http://lists.science.uu.nl/mailman/listinfo/nix-dev > >
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