98 lines
3.2 KiB
Nix
98 lines
3.2 KiB
Nix
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{ stdenv, lib, resholve }:
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{ pname
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, src
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, version
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, passthru ? { }
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, solutions
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, ...
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}@attrs:
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let
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inherit stdenv;
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/* These functions break up the work of partially validating the
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* 'solutions' attrset and massaging it into env/cli args.
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*
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* Note: some of the left-most args do not *have* to be passed as
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* deep as they are, but I've done so to provide more error context
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*/
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# for brevity / line length
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spaces = l: builtins.concatStringsSep " " l;
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semicolons = l: builtins.concatStringsSep ";" l;
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/* Throw a fit with dotted attr path context */
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nope = path: msg:
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throw "${builtins.concatStringsSep "." path}: ${msg}";
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/* Special-case directive value representations by type */
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makeDirective = solution: env: name: val:
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if builtins.isInt val then builtins.toString val
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else if builtins.isString val then name
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else if true == val then name
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else if false == val then "" # omit!
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else if null == val then "" # omit!
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else if builtins.isList val then "${name}:${semicolons val}"
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else nope [ solution env name ] "unexpected type: ${builtins.typeOf val}";
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/* Build fake/fix/keep directives from Nix types */
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makeDirectives = solution: env: val:
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lib.mapAttrsToList (makeDirective solution env) val;
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/* Special-case value representation by type/name */
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makeEnvVal = solution: env: val:
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if env == "inputs" then lib.makeBinPath val
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else if builtins.isString val then val
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else if builtins.isList val then spaces val
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else if builtins.isAttrs val then spaces (makeDirectives solution env val)
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else nope [ solution env ] "unexpected type: ${builtins.typeOf val}";
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/* Shell-format each env value */
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shellEnv = solution: env: value:
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lib.escapeShellArg (makeEnvVal solution env value);
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/* Build a single ENV=val pair */
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makeEnv = solution: env: value:
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"RESHOLVE_${lib.toUpper env}=${shellEnv solution env value}";
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/* Discard attrs claimed by makeArgs */
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removeCliArgs = value:
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removeAttrs value [ "scripts" "flags" ];
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/* Verify required arguments are present */
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validateSolution = { scripts, inputs, interpreter, ... }: true;
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/* Pull out specific solution keys to build ENV=val pairs */
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makeEnvs = solution: value:
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spaces (lib.mapAttrsToList (makeEnv solution) (removeCliArgs value));
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/* Pull out specific solution keys to build CLI argstring */
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makeArgs = { flags ? [ ], scripts, ... }:
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spaces (flags ++ scripts);
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/* Build a single resholve invocation */
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makeInvocation = solution: value:
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if validateSolution value then
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"${makeEnvs solution value} resholve --overwrite ${makeArgs value}"
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else throw "invalid solution"; # shouldn't trigger for now
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/* Build resholve invocation for each solution. */
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makeCommands = solutions:
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lib.mapAttrsToList makeInvocation solutions;
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self = (stdenv.mkDerivation ((removeAttrs attrs [ "solutions" ])
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// {
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inherit pname version src;
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buildInputs = [ resholve ];
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# enable below for verbose debug info if needed
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# supports default python.logging levels
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# LOGLEVEL="INFO";
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preFixup = ''
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pushd "$out"
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${builtins.concatStringsSep "\n" (makeCommands solutions)}
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popd
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'';
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}));
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in
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lib.extendDerivation true passthru self
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