CMake option to build dependencies locally

This makes it easier to install the library from source with pip using a single
command:

    CMAKE_ARGS="-DBUILD_DEPS=yes" pip install tuberd

CMakeLists.txt

@@ -8,6 +8,18 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
 
+# build dependencies if requested
+option(BUILD_DEPS "Build library dependencies")
+
+if(BUILD_DEPS)
+	message(STATUS "Building dependencies: ${CMAKE_SOURCE_DIR}/deps")
+	execute_process(COMMAND ${CMAKE_SOURCE_DIR}/wheels/install_deps.sh
+		RESULT_VARIABLE STATUS)
+	if(STATUS AND NOT STATUS EQUAL 0)
+		message(FATAL_ERROR "Failed to install dependencies: ${STATUS}")
+	endif()
+endif()
+
 # link against deps dir
 if(EXISTS ${CMAKE_SOURCE_DIR}/deps)
 	message(STATUS "Found deps: ${CMAKE_SOURCE_DIR}/deps")

README.rst

@@ -140,20 +140,21 @@ CPython 3.8+:
    pip install tuberd
 
 Building from source requires the ``libfmt`` and ``libmicrohttpd`` dependencies,
-along with ``libhttpserver``.  To ensure that ``cmake`` can find the
-``libhttpserver`` library, you may need to add the path where the
-``FindLibHttpServer.cmake`` file is installed to the ``CMAKE_MODULE_PATH``
-option, for example:
+along with ``libhttpserver``.  To simplify the build process, the
+``wheels/install_deps.sh`` script can be used to build all the dependencies
+locally and compile against them.  In this instance, ``cmake`` should be able to
+discover the appropriate paths for all dependencies.  Use the ``BUILD_DEPS``
+``cmake`` argument to trigger this build with pip:
 
 .. code:: bash
 
-   CMAKE_ARGS="-DCMAKE_MODULE_PATH=/usr/local/share/cmake/Modules" pip install .
+   CMAKE_ARGS="-DBUILD_DEPS=yes" pip install tuberd
 
-To simplify the build process, the ``wheels/install_deps.sh`` script can be used to
-build all the dependencies locally and compile against them.  In this instance,
-``cmake`` should be able to discover the appropriate paths for all dependencies:
+If you prefer to build the dependencies manually, to ensure that ``cmake`` can
+find the ``libhttpserver`` library, you may need to add the path where the
+``FindLibHttpServer.cmake`` file is installed to the ``CMAKE_MODULE_PATH``
+option, for example:
 
 .. code:: bash
 
-   ./wheels/install_deps.sh
-   pip install .
+   CMAKE_ARGS="-DCMAKE_MODULE_PATH=/usr/local/share/cmake/Modules" pip install tuberd

wheels/install_deps.sh

@@ -1,5 +1,23 @@
 #!/bin/sh
 
+# Figure out how to download things
+if wget -q -O /dev/null http://www.google.com; then
+    FETCH () {
+        test -f `basename $1` || wget --no-check-certificate $1
+    }
+elif curl -Ls -o /dev/null http://www.google.com; then
+    FETCH () {
+        test -f `basename $1` || curl -kLO $1
+    }
+elif fetch -o /dev/null http://www.google.com; then
+    FETCH () {
+        test -f `basename $1` || fetch $1
+    }
+else
+    echo "Cannot figure out how to download things!"
+    exit 1
+fi
+
 set -e
 
 scriptdir=$(cd `dirname $0`; pwd -P)
@@ -10,7 +28,7 @@ cd $scriptdir/..
 prefix=$PWD/deps
 cd $prefix
 
-[ -e fmt-10.2.1.zip ] || wget https://github.com/fmtlib/fmt/releases/download/10.2.1/fmt-10.2.1.zip
+[ -e fmt-10.2.1.zip ] || FETCH https://github.com/fmtlib/fmt/releases/download/10.2.1/fmt-10.2.1.zip
 [ -e fmt-10.2.1 ] || unzip fmt-10.2.1.zip
 [ -e fmt-10.2.1/build ] || mkdir fmt-10.2.1/build
 cd fmt-10.2.1/build
@@ -19,7 +37,7 @@ make
 make install
 cd $prefix
 
-[ -e libmicrohttpd-1.0.1.tar.gz ] || wget https://github.com/Karlson2k/libmicrohttpd/releases/download/v1.0.1/libmicrohttpd-1.0.1.tar.gz
+[ -e libmicrohttpd-1.0.1.tar.gz ] || FETCH https://github.com/Karlson2k/libmicrohttpd/releases/download/v1.0.1/libmicrohttpd-1.0.1.tar.gz
 [ -e libmicrohttpd-1.0.1 ] || tar xzf libmicrohttpd-1.0.1.tar.gz
 cd libmicrohttpd-1.0.1
 ./configure --without-gnutls --enable-https=no --enable-shared=no --disable-doc --disable-examples --disable-tools --prefix=$prefix