Add build script that converts C headers to a single nim source

Removes the need to have CMake when requiring this package.

.gitignore

@@ -1,3 +1,4 @@
 *
 !*/
 !*.*
+build

Readme.md

@@ -2,5 +2,4 @@ ngtcp2 for Nim
 ==============
 
 Wrapper around the [ngtcp2](https://github.com/ngtcp2/ngtcp2) C library for
-[Nim](https://nim-lang.org/). Requires [CMake](https://cmake.org/) to be
-installed.
+[Nim](https://nim-lang.org/).

build.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+root=$(dirname "$0")
+
+# install nimterop, if not already installed
+if ! [ -x "$(command -v toast)" ]; then
+  nimble install -y nimterop@0.6.11
+fi
+
+# run cmake on ngtcp2 sources
+cmake -S "${root}/sources" -B "${root}/build"
+
+# socket definitions
+cat "${root}/sockets.nim" > "${root}/ngtcp2.nim"
+
+# dividing line
+echo >> "${root}/ngtcp2.nim"
+
+# generate nim wrapper with nimterop
+toast \
+  --pnim \
+  --preprocess \
+  --includeDirs="${root}/sources/lib/includes" \
+  --includeDirs="${root}/build/lib/includes" \
+  "${root}/sources/lib/includes/ngtcp2/ngtcp2.h" >> "${root}/ngtcp2.nim"

ngtcp2.nimble

@@ -5,9 +5,3 @@ description = "Nim wrapper around the ngtcp2 library"
 license = "MIT"
 
 requires "nim >= 1.2.6"
-requires "nimterop >= 0.6.11 & < 0.7.0"
-
-import os
-
-after install:
-  exec "nim c -r " & currentSourcePath.parentDir/"ngtcp2"/"make.nim"

ngtcp2/make.nim

@@ -1,14 +0,0 @@
-import nimterop/build
-import sources
-
-static:
-  gitPull(
-    "https://github.com/ngtcp2/ngtcp2",
-    checkout="d234d50",
-    outdir=ngtcp2src
-  )
-  cmake(
-    ngtcp2src,
-    check="lib"/"includes"/"ngtcp2"/"version.h",
-    flags="."
-  )

ngtcp2/sources.nim

@@ -1,3 +0,0 @@
-import nimterop/build
-
-const ngtcp2src* = getProjectCacheDir("ngtcp2")

sockets.nim

@@ -0,0 +1,13 @@
+# Import socket definitions from system
+
+when defined(windows):
+  {.passL: "-lws2_32".}
+  const socketheader = "<winsock2.h>"
+else:
+  const socketheader = "<sys/socket.h>"
+
+type
+  sockaddr*
+    {.header: socketheader, importc: "sockaddr".} = object
+  sockaddr_storage*
+    {.header: socketheader, importc: "sockaddr_storage".} = object