polytropos-docrecords (empty) → 0.1.0.2
raw patch · 6 files changed
+1089/−0 lines, 6 filesdep +aesondep +basedep +bytestring
Dependencies added: aeson, base, bytestring, containers, optparse-applicative, polytropos-core, polytropos-docrecords, polytropos-plugin, primitive, tasty, tasty-hunit, text, unordered-containers, yaml
Files
- CHANGELOG.md +20/−0
- LICENSE +391/−0
- README.md +62/−0
- polytropos-docrecords.cabal +77/−0
- src/Polytropos/DocRecord.hs +451/−0
- test/Main.hs +88/−0
+ CHANGELOG.md view
@@ -0,0 +1,20 @@+# Revision history for polytropos-docrecords++## 0.1.0.2 -- 2026-10-21++* Added comprehensive worked examples and when-to-use guidance to front-door Haddock documentation.+* Coordinated version bump across all Polytropos packages.++## 0.1.0.1 -- 2026-10-20++* Coordinated release with `polytropos-core-0.1.0.1`.++## 0.1.0.0 -- 2026-10-19++* Initial release.+* Self-documenting extensible records (`DocRec`) based on Polytropos's flat representation.+* Tri-state missing value semantics (`PossiblyEmpty`).+* Multi-tier provenance tracking (`SourceTag`: `DefaultSource`, `YamlSource`, `CliSource`).+* Automated Markdown documentation generation (`showDocumentation`).+* JSON/YAML merging and partial overriding (`fromJSONAs`).+* Automated CLI option parser synthesis via `optparse-applicative` (`parseRecFromCLI`).
+ LICENSE view
@@ -0,0 +1,391 @@+Polytropos Dual Licensing++Copyright (c) 2026, Nadia Yvette Chambers <nadia.yvette.chambers@ik.me>+All rights reserved.++SPDX-License-Identifier: EUPL-1.2 OR Apache-2.0++Polytropos is dual-licensed: you may use, copy, modify, merge, publish,+distribute, sublicense, and/or sell copies of the software under the terms+of EITHER:++1. The European Union Public Licence, version 1.2 (EUPL-1.2), as published by+ the European Commission (available in 23 authentic language versions); OR+2. The Apache License, Version 2.0 (Apache-2.0).++You may choose whichever license best fits your requirements and compliance+environment.++Individual license files are available in the LICENSES/ directory:+- LICENSES/EUPL-1.2.txt+- LICENSES/Apache-2.0.txt++================================================================================+1. 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+ README.md view
@@ -0,0 +1,62 @@+# polytropos-docrecords++Self-documenting extensible records with provenance tracking and CLI synthesis for [polytropos](https://github.com/NadiaYvette/polytropos).++## Overview++`polytropos-docrecords` provides self-documenting configuration records where every field carries human-readable documentation, tri-state missing value semantics, and provenance tracking (`CLI > YAML > Default`).++Inspired by and acknowledging Yves Parès's `@docrecords@` package from the [Porcupine](https://github.com/funflow/porcupine) pipeline framework, re-architected on top of Polytropos's high-performance flat array representation (`Polytropos.Core.Rep`).++## Features++- **`DocRec`**: Extensible documented record type (`RecordF DocItem r`) backed by Polytropos's $O(1)$ flat array representation.+- **`PossiblyEmpty`**: Distinguishes unconfigured defaults from missing values.+- **`SourceTag`**: Multi-tier configuration provenance (`DefaultSource`, `YamlSource`, `CliSource`) with automatic precedence overriding.+- **`showDocumentation`**: Formats the record schema into human-readable Markdown tables.+- **`fromJSONAs`**: Decodes JSON/YAML against a default schema, updating only provided fields and marking them with `YamlSource`.+- **`parseRecFromCLI`**: Synthesizes full `optparse-applicative` command-line option parsers directly from record schemas with zero boilerplate.++## Quick Example++```haskell+{-# LANGUAGE DataKinds #-}+{-# LANGUAGE OverloadedRecordDot #-}+{-# LANGUAGE OverloadedStrings #-}+{-# OPTIONS_GHC -fplugin=Polytropos.Plugin #-}++import qualified Data.Text.IO as T+import Options.Applicative+import Polytropos+import Polytropos.DocRecord++type ServerConfig =+ '[ "host" := String+ , "port" := Int+ , "verbose" := Bool+ ]++defaultConfig :: DocRec ServerConfig+defaultConfig =+ consDoc (Field @"host") (docField "127.0.0.1" "Listening IP address or hostname")+ $ consDoc (Field @"port") (docField (8080 :: Int) "TCP service port")+ $ consDoc (Field @"verbose") (docField False "Enable debug logging")+ $ emptyDocRec++main :: IO ()+main = do+ -- 1. Print formatted Markdown schema documentation:+ T.putStrLn (showDocumentation defaultConfig)++ -- 2. Inspect individual field values with standard dot notation:+ print (getDocVal defaultConfig.host)+ print (getDocVal defaultConfig.port)+```++## Attribution & Precedents++This package is inspired by Yves Parès's work on `docrecords` within the `porcupine` workflow library. While the interface is re-architected to leverage Polytropos's flat contiguous array physics and compile-time dictionary synthesis, the conceptual model of self-documenting records with provenance tracking originates from `docrecords`.++## License++Dual-licensed under `EUPL-1.2 OR Apache-2.0`.
+ polytropos-docrecords.cabal view
@@ -0,0 +1,77 @@+cabal-version: 3.0+name: polytropos-docrecords+version: 0.1.0.2+synopsis: Self-documenting extensible records with provenance tracking and CLI generation+description:+ Self-documenting extensible records for <https://hackage.haskell.org/package/polytropos polytropos>,+ providing configuration schema extraction, JSON/YAML merging with source provenance, and automated+ CLI parser synthesis via @optparse-applicative@.+ .+ Inspired by and acknowledging Yves Parès's pioneering @docrecords@ package from the+ <https://github.com/funflow/porcupine porcupine> ecosystem, re-architected from scratch+ on top of Polytropos's high-performance flat array representation ('Polytropos.Core.Rep')+ and compile-time dictionary synthesis ('Polytropos.Plugin').+ .+ Key Features:+ .+ * Extensible documented records ('Polytropos.DocRecord.DocRec') with per-field documentation strings.+ * Tri-state missing value semantics ('Polytropos.DocRecord.PossiblyEmpty') distinguishing unconfigured defaults from missing inputs.+ * Hierarchical provenance tracking ('Polytropos.DocRecord.SourceTag') with deterministic override semantics (@CLI > YAML > Default@).+ * Automated Markdown schema generation ('Polytropos.DocRecord.showDocumentation').+ * Zero-boilerplate CLI synthesis ('Polytropos.DocRecord.parseRecFromCLI') generating @optparse-applicative@ options from record schemas.+ .+ Start at the front door module "Polytropos.DocRecord" for comprehensive documentation and worked examples.+license: EUPL-1.2 OR Apache-2.0+license-file: LICENSE+author: Nadia Yvette Chambers+maintainer: nadia.yvette.chambers@ik.me+category: Configuration, Data, Records, CLI+homepage: https://github.com/NadiaYvette/polytropos+bug-reports: https://github.com/NadiaYvette/polytropos/issues+extra-doc-files:+ README.md+ , CHANGELOG.md+build-type: Simple++source-repository head+ type: git+ location: https://github.com/NadiaYvette/polytropos+ subdir: packages/polytropos-docrecords++library+ default-language: GHC2021+ hs-source-dirs: src+ exposed-modules:+ Polytropos.DocRecord+ ghc-options: -Wall+ build-depends:+ base >= 4.14 && < 5,+ aeson >= 2.0 && < 2.3,+ bytestring >= 0.11 && < 0.13,+ containers >= 0.6 && < 0.9,+ optparse-applicative >= 0.17 && < 0.20,+ polytropos-core >= 0.1 && < 0.2,+ polytropos-plugin >= 0.1 && < 0.2,+ primitive >= 0.8 && < 1.0,+ text >= 2.0 && < 2.2,+ unordered-containers >= 0.2.14 && < 0.3,+ yaml >= 0.11 && < 0.12++test-suite polytropos-docrecords-test+ type: exitcode-stdio-1.0+ default-language: GHC2021+ hs-source-dirs: test+ main-is: Main.hs+ ghc-options: -Wall -fplugin=Polytropos.Plugin+ build-depends:+ base,+ aeson,+ bytestring,+ optparse-applicative,+ polytropos-core,+ polytropos-docrecords,+ polytropos-plugin,+ tasty,+ tasty-hunit,+ text,+ yaml
+ src/Polytropos/DocRecord.hs view
@@ -0,0 +1,451 @@+{-# LANGUAGE AllowAmbiguousTypes #-}+{-# LANGUAGE ConstraintKinds #-}+{-# LANGUAGE DataKinds #-}+{-# LANGUAGE DeriveFunctor #-}+{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE GADTs #-}+{-# LANGUAGE MultiParamTypeClasses #-}+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE PatternSynonyms #-}+{-# LANGUAGE PolyKinds #-}+{-# LANGUAGE RankNTypes #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeApplications #-}+{-# LANGUAGE TypeFamilies #-}+{-# LANGUAGE TypeOperators #-}+{-# LANGUAGE UndecidableInstances #-}++-- |+-- Module : Polytropos.DocRecord+-- Description : Self-documenting extensible records with provenance tracking and CLI synthesis+-- Copyright : (c) 2026 Nadia Yvette Chambers+-- License : EUPL-1.2 OR Apache-2.0+-- Maintainer : nadia.yvette.chambers@ik.me+-- Stability : experimental+-- Portability : non-portable (GHC extensions)+--+-- Self-documenting extensible configuration records for the 'Polytropos' open record ecosystem.+--+-- = Precedents & Attribution+-- This package is an architectural reimplementation inspired by Yves Parès's pioneering+-- @docrecords@ package from the <https://github.com/funflow/porcupine porcupine> workflow library.+-- Where the original @docrecords@ used Vinyl linked lists ('Data.Vinyl.Core.Rec') with+-- \(O(N)\) inductive dictionary resolution, @polytropos-docrecords@ rebuilds these capabilities+-- directly on top of Polytropos's high-performance flat contiguous array representation+-- ('Polytropos.Core.Rep') and compile-time dictionary synthesis ('Polytropos.Plugin').+--+-- = Key Architecture+-- 1. 'DocRec': Extensible documented record ('RecordF DocItem r') stored in contiguous memory.+-- 2. 'PossiblyEmpty': Tri-state value semantics distinguishing unconfigured defaults from missing values.+-- 3. 'SourceTag': Strict priority provenance tracking (@CLI > YAML > Default@).+-- 4. 'showDocumentation': Automated generation of formatted Markdown schema tables.+-- 5. 'fromJSONAs' & 'fromYamlAs': Schema-guided JSON/YAML deserialization with source attribution.+-- 6. 'parseRecFromCLI': Zero-boilerplate @optparse-applicative@ CLI option synthesis.+--+-- = When to Use This Module+--+-- * When building configuration layers combining default values, environment+-- profiles (JSON/YAML), and CLI flags with deterministic priority precedence.+-- * When generating automated, human-readable Markdown documentation tables of+-- configuration schemas for manuals or repository documentation.+-- * When synthesizing @optparse-applicative@ CLI argument parsers directly from+-- open row definitions without manual flag boilerplate.+--+-- = Worked Example+--+-- Constructing a documented configuration record, extracting documentation,+-- and merging with partial JSON:+--+-- > {-# LANGUAGE DataKinds #-}+-- > {-# LANGUAGE OverloadedRecordDot #-}+-- > {-# LANGUAGE OverloadedStrings #-}+-- > {-# OPTIONS_GHC -fplugin=Polytropos.Plugin #-}+-- >+-- > import Data.Aeson (object, (.=))+-- > import Polytropos+-- > import Polytropos.DocRecord+-- >+-- > type ServerConfig =+-- > '[ "host" ':= String+-- > , "port" ':= Int+-- > , "verbose" ':= Bool+-- > ]+-- >+-- > defaultConfig :: DocRec ServerConfig+-- > defaultConfig =+-- > consDoc (Field @"host") (docField "127.0.0.1" "Listening host IP")+-- > $ consDoc (Field @"port") (docField (8080 :: Int) "TCP listen port")+-- > $ consDoc (Field @"verbose") (docField False "Enable debug logs")+-- > $ emptyDocRec+-- >+-- > -- 1. Render Markdown documentation table:+-- > docTable = showDocumentation defaultConfig+-- >+-- > -- 2. Merge partial JSON configuration (e.g. from a config file):+-- > Right cfg = case fromJSONAs defaultConfig (object ["port" .= (9090 :: Int)]) of+-- > Data.Aeson.Success c -> Right c+-- > Data.Aeson.Error e -> Left e+-- >+-- > -- 3. Inspect values and provenance using OverloadedRecordDot:+-- > currentPort = getDocVal cfg.port -- Just 9090+-- > portSource = diSource cfg.port -- YamlSource+-- > currentHost = getDocVal cfg.host -- Just "127.0.0.1"+-- > hostSource = diSource cfg.host -- DefaultSource+module Polytropos.DocRecord+ ( -- * Core Documented Record Types+ DocRec+ , DocItem(..)+ , PossiblyEmpty(.., Present, Missing)+ , MissingValueReason(..)+ , SourceTag(..)++ -- * Field Constructors & Utilities+ , docField+ , fieldNoDef+ , docItemWithSource+ , getDocVal+ , requireDocVal+ , emptyDocRec+ , consDoc++ -- * Schema Inspection & Markdown Documentation+ , DocFieldEntry(..)+ , DocSchema(..)+ , showDocumentation+ , schemaMarkdownTable++ -- * JSON / YAML Parsing with Provenance+ , DocJsonMerge(..)+ , fromJSONAs+ , fromYamlAs++ -- * Priority Merging+ , DocMerge(..)++ -- * CLI Synthesis via Optparse-Applicative+ , CliField(..)+ , CliRecord(..)+ , execDocRecParser+ ) where++import Data.Aeson (FromJSON(..), ToJSON(..), Value(..), Result(..), fromJSON)+import qualified Data.Aeson.Key as Key+import qualified Data.Aeson.KeyMap as KM+import qualified Data.ByteString as BS+import Data.Kind (Type)+import Data.Primitive.SmallArray (indexSmallArray)+import Data.Proxy (Proxy(..))+import Data.Text (Text)+import qualified Data.Text as T+import qualified Data.Yaml as Y+import GHC.TypeLits (KnownSymbol, Symbol, symbolVal)+import GHC.Exts (toList)+import Options.Applicative hiding (Success)+import Polytropos.Core (Pair(..), RowRep(..), Rep(..), productRep, repVals)+import Polytropos (RecordF, emptyRecordF, Field(..))+import Type.Reflection (Typeable, typeRep)+import Unsafe.Coerce (unsafeCoerce)++--------------------------------------------------------------------------------+-- 1. Core Documented Record Types+--------------------------------------------------------------------------------++-- | Explains why a configuration field currently holds no value.+data MissingValueReason+ = NoDefault+ -- ^ Field was declared without a default value ('fieldNoDef').+ | MissingValueInJSON+ -- ^ Field was expected during JSON/YAML parsing but was absent from the payload.+ | MissingValueInCLI+ -- ^ Field was expected from the CLI options but was omitted.+ deriving (Show, Eq, Ord)++-- | Wraps a value to represent tri-state configuration existence:+-- 1. A present value ('Present').+-- 2. An empty field with an explicit missing reason ('Missing').+newtype PossiblyEmpty a = PE { unPE :: Either MissingValueReason a }+ deriving (Functor, Eq, Ord)++pattern Present :: a -> PossiblyEmpty a+pattern Present x = PE (Right x)++pattern Missing :: MissingValueReason -> PossiblyEmpty a+pattern Missing r = PE (Left r)++{-# COMPLETE Present, Missing #-}++instance Applicative PossiblyEmpty where+ pure = Present+ PE (Right f) <*> PE (Right x) = PE (Right (f x))+ PE (Left r) <*> _ = PE (Left r)+ _ <*> PE (Left r) = PE (Left r)++instance Semigroup a => Semigroup (PossiblyEmpty a) where+ PE (Right a) <> PE (Right b) = PE (Right (a <> b))+ PE (Right a) <> PE (Left _) = PE (Right a)+ PE (Left _) <> PE (Right b) = PE (Right b)+ PE (Left a) <> PE (Left b) = PE (Left (max a b))++instance Semigroup a => Monoid (PossiblyEmpty a) where+ mempty = PE (Left NoDefault)++instance Show a => Show (PossiblyEmpty a) where+ show (PE (Right x)) = show x+ show (PE (Left r)) = "(empty: " ++ show r ++ ")"++instance ToJSON a => ToJSON (PossiblyEmpty a) where+ toJSON (PE (Right x)) = toJSON x+ toJSON (PE (Left _)) = Null++instance FromJSON a => FromJSON (PossiblyEmpty a) where+ parseJSON Null = pure (PE (Left MissingValueInJSON))+ parseJSON v = Present <$> parseJSON v++-- | Provenance tracking for configuration values.+--+-- The 'Ord' instance enforces strict configuration precedence:+-- @DefaultSource < YamlSource < CliSource@.+-- Command line arguments always override configuration files, which override in-code defaults.+data SourceTag+ = DefaultSource+ -- ^ In-code fallback default.+ | YamlSource+ -- ^ Sourced from a YAML/JSON configuration file.+ | CliSource+ -- ^ Sourced from a command-line flag or argument.+ deriving (Show, Eq, Ord, Enum, Bounded)++-- | A self-documenting field payload wrapper for higher-kinded records.+data DocItem a = DocItem+ { diValue :: !(PossiblyEmpty a)+ -- ^ The optional or defaulted payload value.+ , diDoc :: !Text+ -- ^ Human-readable documentation for this field.+ , diSource :: !SourceTag+ -- ^ The provenance source of the current value.+ } deriving (Show, Eq, Functor)++instance ToJSON a => ToJSON (DocItem a) where+ toJSON di = toJSON (diValue di)++-- | An open, self-documenting record parametrised by row @r@.+-- Backed by Polytropos's $O(1)$ contiguous 'Polytropos.Core.Rep' array.+type DocRec r = RecordF DocItem r++--------------------------------------------------------------------------------+-- 2. Field Constructors & Utilities+--------------------------------------------------------------------------------++-- | Construct a documented field with an initial default value and 'DefaultSource'.+docField :: a -> Text -> DocItem a+docField val doc = DocItem (Present val) doc DefaultSource++-- | Construct an unconfigured documented field with no default value.+fieldNoDef :: Text -> DocItem a+fieldNoDef doc = DocItem (Missing NoDefault) doc DefaultSource++-- | Construct a documented field with explicit source provenance.+docItemWithSource :: SourceTag -> PossiblyEmpty a -> Text -> DocItem a+docItemWithSource src val doc = DocItem val doc src++-- | Extract the present value of a documented field, if set.+getDocVal :: DocItem a -> Maybe a+getDocVal (DocItem (Present x) _ _) = Just x+getDocVal _ = Nothing++-- | Require a documented field to be present, returning an error message if missing.+requireDocVal :: Text -> DocItem a -> Either Text a+requireDocVal _ (DocItem (Present x) _ _) = Right x+requireDocVal fieldName (DocItem (Missing r) doc _) =+ Left $ "Configuration field '" <> fieldName <> "' is missing (" <> T.pack (show r) <> "). " <> doc++-- | Empty documented record.+emptyDocRec :: DocRec '[]+emptyDocRec = emptyRecordF++-- | Prepend a documented field to a documented record.+consDoc :: forall (n :: Symbol) a r. Field n -> DocItem a -> DocRec r -> DocRec ((n ':= a) ': r)+consDoc _ val (RowRep r) =+ RowRep (productRep (unsafeCoerce val : toList (repVals r)))++--------------------------------------------------------------------------------+-- 3. Schema Inspection & Markdown Documentation+--------------------------------------------------------------------------------++-- | Metadata entry describing a single record field.+data DocFieldEntry = DocFieldEntry+ { dfeName :: !Text+ -- ^ The type-level field symbol.+ , dfeType :: !Text+ -- ^ Human-readable name of the Haskell payload type.+ , dfeDoc :: !Text+ -- ^ Field documentation string.+ , dfeDefaultText :: !(Maybe Text)+ -- ^ Rendered default value representation, if present.+ , dfeCurrentSrc :: !SourceTag+ -- ^ Provenance source of the active value.+ } deriving (Show, Eq)++-- | Inductive class to reflect field metadata across a documented row.+class DocSchema (r :: [Pair Symbol Type]) where+ docSchemaEntries :: DocRec r -> [DocFieldEntry]++instance DocSchema '[] where+ docSchemaEntries _ = []++-- | Deconstruct the first documented field and remaining tail from a 'DocRec'.+splitDocHead :: forall n a rest. DocRec ((n ':= a) ': rest) -> (DocItem a, DocRec rest)+splitDocHead (RowRep (Rep _ v)) =+ let h = unsafeCoerce (indexSmallArray v 0) :: DocItem a+ restVals = drop 1 (toList v)+ in (h, RowRep (productRep restVals))++instance (KnownSymbol n, Typeable a, Show a, DocSchema rest)+ => DocSchema ((n ':= a) ': rest) where+ docSchemaEntries rec =+ let name = T.pack (symbolVal (Proxy @n))+ tyName = T.pack (show (typeRep @a))+ (firstVal, restRec) = splitDocHead rec+ entry = DocFieldEntry+ { dfeName = name+ , dfeType = tyName+ , dfeDoc = diDoc firstVal+ , dfeDefaultText = case diValue firstVal of+ Present x -> Just (T.pack (show x))+ Missing _ -> Nothing+ , dfeCurrentSrc = diSource firstVal+ }+ in entry : docSchemaEntries restRec++-- | Render a documented record's schema into a formatted Markdown table.+showDocumentation :: forall r. DocSchema r => DocRec r -> Text+showDocumentation rec = schemaMarkdownTable (docSchemaEntries rec)++-- | Render a list of field entries into a GitHub-flavored Markdown table.+schemaMarkdownTable :: [DocFieldEntry] -> Text+schemaMarkdownTable entries =+ T.unlines $+ [ "| Field | Type | Default | Source | Description |"+ , "|:---|:---|:---|:---|:---|"+ ] ++ map formatRow entries+ where+ formatRow e =+ "| `" <> dfeName e <> "` | `" <> dfeType e <> "` | "+ <> maybe "*none*" (\d -> "`" <> d <> "`") (dfeDefaultText e) <> " | "+ <> T.pack (show (dfeCurrentSrc e)) <> " | "+ <> dfeDoc e <> " |"++--------------------------------------------------------------------------------+-- 4. JSON / YAML Parsing with Provenance+--------------------------------------------------------------------------------++-- | Typeclass for schema-guided JSON/YAML deserialization into a 'DocRec'.+class DocJsonMerge (r :: [Pair Symbol Type]) where+ mergeFromJsonValue :: DocRec r -> Value -> Result (DocRec r)++instance DocJsonMerge '[] where+ mergeFromJsonValue _ _ = pure emptyDocRec++instance (KnownSymbol n, FromJSON a, DocJsonMerge rest)+ => DocJsonMerge ((n ':= a) ': rest) where+ mergeFromJsonValue rec val = do+ let name = symbolVal (Proxy @n)+ k = Key.fromString name+ (itemHead, restRec) = splitDocHead rec+ updatedHead <- case val of+ Object obj -> case KM.lookup k obj of+ Just fieldVal -> do+ parsed <- fromJSON fieldVal+ pure $ DocItem (Present parsed) (diDoc itemHead) YamlSource+ Nothing ->+ -- Field missing in JSON: preserve default if present, else mark missing+ case diValue itemHead of+ Present _ -> pure itemHead+ Missing _ -> pure $ DocItem (Missing MissingValueInJSON) (diDoc itemHead) (diSource itemHead)+ _ -> pure itemHead+ updatedRest <- mergeFromJsonValue restRec val+ pure (consDoc (Field @n) updatedHead updatedRest)++-- | Deserialize JSON into a 'DocRec' guided by an initial default schema.+-- Fields present in the JSON are updated and marked with 'YamlSource'.+fromJSONAs :: DocJsonMerge r => DocRec r -> Value -> Result (DocRec r)+fromJSONAs = mergeFromJsonValue++-- | Parse YAML byte content into a 'DocRec' guided by an initial default schema.+fromYamlAs :: DocJsonMerge r => DocRec r -> BS.ByteString -> Either Y.ParseException (DocRec r)+fromYamlAs schema bs = do+ val <- Y.decodeEither' bs+ case fromJSONAs schema val of+ Success r -> Right r+ Error err -> Left (Y.AesonException err)++--------------------------------------------------------------------------------+-- 5. Priority Merging (CLI > YAML > Default)+--------------------------------------------------------------------------------++-- | Inductive class to merge two documented records field-by-field, choosing+-- the value with highest 'SourceTag' priority.+class DocMerge (r :: [Pair Symbol Type]) where+ mergeDocRec :: DocRec r -> DocRec r -> DocRec r++instance DocMerge '[] where+ mergeDocRec _ _ = emptyDocRec++instance (KnownSymbol n, DocMerge rest) => DocMerge ((n ':= a) ': rest) where+ mergeDocRec r1 r2 =+ let (h1, t1) = splitDocHead r1+ (h2, t2) = splitDocHead r2+ winner = if diSource h1 >= diSource h2 then h1 else h2+ mergedRest = mergeDocRec t1 t2+ in consDoc (Field @n) winner mergedRest++--------------------------------------------------------------------------------+-- 6. CLI Option Parser Synthesis via Optparse-Applicative+--------------------------------------------------------------------------------++-- | Defines how a field type is parsed from command-line arguments.+class CliField a where+ cliOptionModifier :: String -> Text -> PossiblyEmpty a -> Parser (PossiblyEmpty a)++instance {-# OVERLAPPING #-} CliField Bool where+ cliOptionModifier name doc defVal =+ let opt = switch (long name <> help (T.unpack doc))+ in fmap toVal opt+ where+ toVal True = Present True+ toVal False = defVal++instance {-# OVERLAPPABLE #-} (Read a, Show a) => CliField a where+ cliOptionModifier name doc defVal =+ let docWithDef = case defVal of+ Present x -> doc <> " (default: " <> T.pack (show x) <> ")"+ Missing _ -> doc+ p = option auto (long name <> help (T.unpack docWithDef))+ in fmap Present p <|> pure defVal++-- | Automatically synthesizes an @optparse-applicative@ 'Parser' for a 'DocRec'.+class CliRecord (r :: [Pair Symbol Type]) where+ parseRecFromCLI :: DocRec r -> Parser (DocRec r)++instance CliRecord '[] where+ parseRecFromCLI _ = pure emptyDocRec++instance (KnownSymbol n, Eq a, CliField a, CliRecord rest)+ => CliRecord ((n ':= a) ': rest) where+ parseRecFromCLI rec =+ let name = symbolVal (Proxy @n)+ (itemHead, restRec) = splitDocHead rec+ cliParser = cliOptionModifier @a name (diDoc itemHead) (diValue itemHead)+ makeItem val =+ let src = if val /= diValue itemHead then CliSource else diSource itemHead+ in DocItem val (diDoc itemHead) src+ headParser = fmap makeItem cliParser+ restParser = parseRecFromCLI restRec+ in consDoc (Field @n) <$> headParser <*> restParser++-- | Helper to run an synthesized CLI parser with standard header and help.+execDocRecParser :: CliRecord r => Text -> DocRec r -> IO (DocRec r)+execDocRecParser desc schema =+ execParser (info (parseRecFromCLI schema <**> helper) (fullDesc <> progDesc (T.unpack desc)))+
+ test/Main.hs view
@@ -0,0 +1,88 @@+{-# LANGUAGE DataKinds #-}+{-# LANGUAGE OverloadedRecordDot #-}+{-# LANGUAGE OverloadedStrings #-}+{-# OPTIONS_GHC -fplugin=Polytropos.Plugin #-}++module Main (main) where++import qualified Data.Aeson as Aeson+import Data.Aeson (object, (.=))+import qualified Data.Text as T+import qualified Options.Applicative as Opt+import Options.Applicative (info, idm, defaultPrefs, execParserPure)+import Polytropos+import Polytropos.DocRecord+import Test.Tasty+import Test.Tasty.HUnit++type ServerConfig =+ '[ "host" := String+ , "port" := Int+ , "verbose" := Bool+ ]++defaultConfig :: DocRec ServerConfig+defaultConfig =+ consDoc (Field @"host") (docField "127.0.0.1" "Listening host IP")+ $ consDoc (Field @"port") (docField (8080 :: Int) "TCP listen port")+ $ consDoc (Field @"verbose") (docField False "Enable debug logs")+ $ emptyDocRec++main :: IO ()+main = defaultMain tests++tests :: TestTree+tests = testGroup "Polytropos.DocRecord"+ [ testCase "inspect default values with OverloadedRecordDot" $ do+ getDocVal defaultConfig.host @?= Just "127.0.0.1"+ getDocVal defaultConfig.port @?= Just 8080+ getDocVal defaultConfig.verbose @?= Just False+ diSource defaultConfig.host @?= DefaultSource+ diSource defaultConfig.port @?= DefaultSource++ , testCase "showDocumentation renders markdown schema table" $ do+ let doc = showDocumentation defaultConfig+ assertBool "contains host field" (T.isInfixOf "`host`" doc)+ assertBool "contains port field" (T.isInfixOf "`port`" doc)+ assertBool "contains verbose field" (T.isInfixOf "`verbose`" doc)+ assertBool "contains port type Int" (T.isInfixOf "`Int`" doc)+ assertBool "contains default 8080" (T.isInfixOf "`8080`" doc)++ , testCase "fromJSONAs merges partial JSON and tags with YamlSource" $ do+ let jsonPayload = object [ "port" .= (9090 :: Int) ]+ case fromJSONAs defaultConfig jsonPayload of+ Aeson.Error err -> assertFailure ("JSON merge failed: " ++ err)+ Aeson.Success cfg -> do+ -- port was updated:+ getDocVal cfg.port @?= Just 9090+ diSource cfg.port @?= YamlSource+ -- host was preserved from defaults:+ getDocVal cfg.host @?= Just "127.0.0.1"+ diSource cfg.host @?= DefaultSource++ , testCase "priority merging chooses higher SourceTag" $ do+ let cliItem = docItemWithSource CliSource (Present (9999 :: Int)) "CLI port"+ cliConfig = consDoc (Field @"host") defaultConfig.host+ $ consDoc (Field @"port") cliItem+ $ consDoc (Field @"verbose") defaultConfig.verbose+ $ emptyDocRec++ merged = mergeDocRec defaultConfig cliConfig+ getDocVal merged.port @?= Just 9999+ diSource merged.port @?= CliSource++ , testCase "parseRecFromCLI parses command-line flags and tags with CliSource" $ do+ let pinfo = info (parseRecFromCLI defaultConfig) idm+ args = ["--port", "7777", "--verbose"]+ parsed = execParserPure defaultPrefs pinfo args+ case parsed of+ Opt.Failure failure -> assertFailure ("CLI parser failed: " ++ show failure)+ Opt.CompletionInvoked _ -> assertFailure "Unexpected completion invocation"+ Opt.Success cfg -> do+ getDocVal cfg.port @?= Just 7777+ diSource cfg.port @?= CliSource+ getDocVal cfg.verbose @?= Just True+ diSource cfg.verbose @?= CliSource+ getDocVal cfg.host @?= Just "127.0.0.1"+ diSource cfg.host @?= DefaultSource+ ]