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{options, config, lib, pkgs, ...}: | |
with lib; | |
let | |
cfg = config.webapp; | |
in { | |
## Interface ## | |
options.webapp = { | |
presets = mkOption { | |
default = {}; | |
example = literalExample '' | |
{ | |
name = { | |
options: { <additional options> } | |
mkConfig: config: virtualHost | |
}; | |
} | |
''; | |
description = "Presets"; | |
type = types.attrsOf (types.submodule ({config, ...}: { | |
options = { | |
options = mkOption { | |
type = types.attrs; | |
default = {}; | |
description = "Preset specific options"; | |
}; | |
mkConfig = mkOption { | |
type = mkOptionType { | |
name = "function"; | |
check = f: (builtins.typeOf f) == "lambda"; | |
}; | |
default = opts: {}; | |
description = "Preset config function"; | |
}; | |
}; | |
})); | |
}; | |
applications = mkOption { | |
default = {}; | |
example = ''{ | |
"example.com" = { | |
preset = "static"; | |
# preset specific options | |
root = "/var/www/example_com"; | |
} | |
}''; | |
description = "Applications"; | |
type = types.attrsOf (types.submodule ({config, ...}: { | |
options = { | |
preset = mkOption { | |
example = "static"; | |
type = types.enum (attrNames cfg.presets); | |
description = "The preset for application."; | |
default = "base"; | |
}; | |
} // cfg.presets."${config.preset}".options; # <- infinite recursion occurs here | |
})); | |
}; | |
}; | |
## Implementation ## | |
config = { | |
environment.systemPackages = [ pkgs.libidn ]; | |
services.nginx.virtualHosts = mapAttrs (serverName: opts@{preset, ...}: | |
(cfg.presets."${preset}".mkConfig opts)) cfg.applications; | |
webapp.presets.static = { | |
options = { | |
root = mkOption { | |
type = types.str; | |
description = "Root directory of application"; | |
}; | |
}; | |
mkConfig = {root, ...}: { | |
locations."/".root = root; | |
}; | |
}; | |
## Test app config ## | |
webapp.applications."example.com" = { | |
preset = "static"; | |
root = "/var/www/example.com"; | |
}; | |
}; | |
} |
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