From 69c8e8bb4a4088f62cebaaf39aac99a175cfb682 Mon Sep 17 00:00:00 2001
From: Mohd Bilal <mohd.bilal1996@gmail.com>
Date: Tue, 14 Mar 2023 19:55:47 +0530
Subject: [PATCH] Make command to generate types from typed metadata in
 languages other than Typescript

PR-URL: https://github.com/hasura/graphql-engine-mono/pull/8238
GitOrigin-RevId: 9a4730e0d311916c0d837586485382c58033c914
---
 metadata-api-types/.gitignore                 |  4 ++
 metadata-api-types/Makefile                   | 60 +++++++++++++++++--
 .../scripts/generate-types-for-lang.sh        | 25 ++++++++
 ...-types.sh => generate-typescript-types.sh} |  0
 4 files changed, 84 insertions(+), 5 deletions(-)
 create mode 100644 metadata-api-types/.gitignore
 create mode 100755 metadata-api-types/scripts/generate-types-for-lang.sh
 rename metadata-api-types/scripts/{generate-types.sh => generate-typescript-types.sh} (100%)

diff --git a/metadata-api-types/.gitignore b/metadata-api-types/.gitignore
new file mode 100644
index 00000000000..59a7c520860
--- /dev/null
+++ b/metadata-api-types/.gitignore
@@ -0,0 +1,4 @@
+go/
+haskell/
+rust/
+kotlin/
diff --git a/metadata-api-types/Makefile b/metadata-api-types/Makefile
index 77bf0b7b0cb..b393c3b6249 100644
--- a/metadata-api-types/Makefile
+++ b/metadata-api-types/Makefile
@@ -5,6 +5,24 @@ TYPESCRIPT_ROOT := typescript
 TYPESCRIPT_SRC := ${TYPESCRIPT_ROOT}/src
 PATCHES := $(wildcard ${TYPESCRIPT_ROOT}/patches/*.patch)
 
+FILE_NAME := metadata.openapi
+
+GO_ROOT := go
+GO_FILE := ${FILE_NAME}.go
+GO_TARGET := ${GO_ROOT}/${GO_FILE}
+
+RUST_ROOT := rust
+RUST_FILE := ${FILE_NAME}.rs
+RUST_TARGET := ${RUST_ROOT}/${RUST_FILE}
+
+HASKELL_ROOT := haskell
+HASKELL_FILE := ${FILE_NAME}.hs
+HASKELL_TARGET := ${HASKELL_ROOT}/${HASKELL_FILE}
+
+KOTLIN_ROOT := kotlin
+KOTLIN_FILE := ${FILE_NAME}.kt
+KOTLIN_TARGET := ${KOTLIN_ROOT}/${KOTLIN_FILE}
+
 # default target
 .PHONY: help
 ## help: prints help message
@@ -13,18 +31,50 @@ help:
 	@sed -n 's/^##//p' ${MAKEFILE_LIST} | column -t -s ':' |  sed -e 's/^/ /'
 
 .PHONY: generate-types
-## generate-types: Generate the TypeScript types for working with the Metadata API
-generate-types: ${TYPESCRIPT_SRC}
+## generate-types: Generate types for working with the Metadata API
+generate-types: generate-typescript-types generate-go-types generate-rust-types generate-haskell-types generate-kotlin-types
+
+.PHONY: generate-typescript-types
+## generate-typescript-types: Generate the TypeScript types for working with the Metadata API
+generate-typescript-types: ${TYPESCRIPT_SRC}
+
+.PHONY: generate-go-types
+## generate-go-types: Generate the Go types for working with the Metadata API
+generate-go-types: ${GO_TARGET}
+
+.PHONY: generate-rust-types
+## generate-rust-types: Generate the Rust types for working with the Metadata API
+generate-rust-types: ${RUST_TARGET}
+
+.PHONY: generate-haskell-types
+## generate-haskell-types: Generate the Haskell types for working with the Metadata API
+generate-haskell-types: ${HASKELL_TARGET}
+
+.PHONY: generate-kotlin-types
+## generate-kotlin-types: Generate the Kotlin types for working with the Metadata API
+generate-kotlin-types: ${KOTLIN_TARGET}
 
 .PHONY: typecheck
 ## typecheck: Typechecks generated type definitions
 typecheck: typecheck-metadata-api-types
 
-${TYPESCRIPT_SRC}: ${SCHEMA_FILE} ${TYPESCRIPT_ROOT}/package.json ${TYPESCRIPT_ROOT}/package-lock.json ${PATCHES}
-	./scripts/generate-types.sh "${SCHEMA_FILE}"
-
 .PHONY: typecheck-metadata-api-types
 ## typecheck-metadata-api-types: Typechecks the metadata-api-types
 typecheck-metadata-api-types:
 	cd ${TYPESCRIPT_ROOT} && \
 	npm run typecheck
+
+${TYPESCRIPT_SRC}: ${SCHEMA_FILE} ${TYPESCRIPT_ROOT}/package.json ${TYPESCRIPT_ROOT}/package-lock.json ${PATCHES}
+	./scripts/generate-typescript-types.sh "${SCHEMA_FILE}"
+
+${GO_TARGET}: ${TYPESCRIPT_SRC}
+	./scripts/generate-types-for-lang.sh ${GO_ROOT} ${GO_FILE}
+
+${RUST_TARGET}: ${TYPESCRIPT_SRC}
+	./scripts/generate-types-for-lang.sh ${RUST_ROOT} ${RUST_FILE}
+
+${HASKELL_TARGET}: ${TYPESCRIPT_SRC}
+	./scripts/generate-types-for-lang.sh ${HASKELL_ROOT} ${HASKELL_FILE}
+
+${KOTLIN_TARGET}: ${TYPESCRIPT_SRC}
+	./scripts/generate-types-for-lang.sh ${KOTLIN_ROOT} ${KOTLIN_FILE}
diff --git a/metadata-api-types/scripts/generate-types-for-lang.sh b/metadata-api-types/scripts/generate-types-for-lang.sh
new file mode 100755
index 00000000000..f8debe5d3fd
--- /dev/null
+++ b/metadata-api-types/scripts/generate-types-for-lang.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PROJECT_ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )/.." >/dev/null 2>&1 && pwd )"   # ... https://stackoverflow.com/a/246128/176841
+
+LANG="$1"
+FILE="$2"
+# We are generating types from already generated Typescript types. 
+# `index.js`` is the file that contains the Typescript types
+INDEX_JS="${PROJECT_ROOT}/typescript/src/index.ts" 
+
+# Dir where generated types will be published. 
+DIR="${PROJECT_ROOT}/${LANG}"
+
+if [ ! -d "${DIR}" ]; then
+    mkdir "${DIR}"
+fi
+
+# npm package used to generate types. 
+# Use `quicktype --help` to see a list of supported languages. 
+# Use `npm i -g quicktype` to install.
+quicktype --lang "${LANG}" \
+    --out "${DIR}/${FILE}" \
+    --src-lang typescript \
+    --src "${INDEX_JS}" # add --quiet to silence output
diff --git a/metadata-api-types/scripts/generate-types.sh b/metadata-api-types/scripts/generate-typescript-types.sh
similarity index 100%
rename from metadata-api-types/scripts/generate-types.sh
rename to metadata-api-types/scripts/generate-typescript-types.sh