Setup proper configure script (#4)

.Rbuildignore

@@ -6,3 +6,4 @@
 ^\.travis\.yml$
 ^appveyor\.yml$
 ^codecov\.yml$
+^src/Makevars$

.gitignore

@@ -7,3 +7,4 @@ systemfonts.Rproj
 src/*.o
 src/*.so
 src/*/*.o
+src/Makevars

DESCRIPTION

@@ -26,7 +26,6 @@ Encoding: UTF-8
 LazyData: true
 Roxygen: list(markdown = TRUE)
 RoxygenNote: 6.1.1
-SystemRequirements: GNU make
 Suggests: 
     testthat (>= 2.1.0),
     covr

configure

@@ -0,0 +1,74 @@
+#!/bin/bash
+# Anticonf (tm) script by Jeroen Ooms (2019)
+# This script will query 'pkg-config' for the required cflags and ldflags.
+# If pkg-config is unavailable or does not find the library, try setting
+# INCLUDE_DIR and LIB_DIR manually via e.g:
+# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'
+
+# Library settings
+PKG_CONFIG_NAME="freetype2"
+PKG_DEB_NAME="libfreetype6-dev"
+PKG_RPM_NAME="freetype-devel"
+PKG_BREW_NAME="freetype"
+PKG_TEST_HEADER="<ft2build.h>"
+PKG_LIBS="-lfreetype"
+
+# We use special config on MacOS
+if [[ "$OSTYPE" == "darwin"* ]]; then
+SYS="DARWIN"
+PKG_LIBS="$PKG_LIBS -framework CoreText -framework Foundation"
+else
+SYS="UNIX"
+PKG_CONFIG_NAME="$PKG_CONFIG_NAME fontconfig"
+fi
+
+# Use pkg-config if available
+if [ $(command -v pkg-config) ]; then
+  PKGCONFIG_CFLAGS=$(pkg-config --cflags --silence-errors ${PKG_CONFIG_NAME})
+  PKGCONFIG_LIBS=$(pkg-config --libs ${PKG_CONFIG_NAME})
+fi
+
+# Note that cflags may be empty in case of success
+if [ "$INCLUDE_DIR" ] || [ "$LIB_DIR" ]; then
+  echo "Found INCLUDE_DIR and/or LIB_DIR!"
+  PKG_CFLAGS="-I$INCLUDE_DIR $PKG_CFLAGS"
+  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
+elif [ "$PKGCONFIG_CFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
+  echo "Found pkg-config cflags and libs!"
+  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
+  PKG_LIBS=${PKGCONFIG_LIBS}
+fi
+
+# For debugging
+echo "Using PKG_CFLAGS=$PKG_CFLAGS"
+echo "Using PKG_LIBS=$PKG_LIBS"
+
+# Find compiler
+CC=$(${R_HOME}/bin/R CMD config CC)
+CFLAGS=$(${R_HOME}/bin/R CMD config CFLAGS)
+CPPFLAGS=$(${R_HOME}/bin/R CMD config CPPFLAGS)
+
+# Test configuration
+echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null
+
+# Customize the error
+if [ $? -ne 0 ]; then
+  echo "------------------------- ANTICONF ERROR ---------------------------"
+  echo "Configuration failed because $PKG_CONFIG_NAME was not found. Try installing:"
+  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu, etc)"
+  echo " * rpm: $PKG_RPM_NAME (Fedora, EPEL)"
+  echo " * csw: $PKG_CSW_NAME (Solaris)"
+  echo " * brew: $PKG_BREW_NAME (OSX)"
+  echo "If $PKG_CONFIG_NAME is already installed, check that 'pkg-config' is in your"
+  echo "PATH and PKG_CONFIG_PATH contains a $PKG_CONFIG_NAME.pc file. If pkg-config"
+  echo "is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:"
+  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
+  echo "--------------------------------------------------------------------"
+  exit 1;
+fi
+
+# Write to Makevars
+sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" -e "s|@SYS@|$SYS|" src/Makevars.in > src/Makevars
+
+# Success
+exit 0

src/Makevars.in

@@ -0,0 +1,11 @@
+PKG_CPPFLAGS=@cflags@ -DSTRICT_R_HEADERS
+PKG_LIBS=@libs@
+
+DARWIN_OBJECTS = mac/FontManagerMac.o
+UNIX_OBJECTS = unix/FontManagerLinux.o
+OBJECTS = systemfonts.o init.o $(@SYS@_OBJECTS)
+
+all: clean
+
+clean:
+	rm -f $(SHLIB) $(OBJECTS)

src/mac/FontManagerMac.mm

@@ -1,6 +1,6 @@
 #include <Foundation/Foundation.h>
 #include <CoreText/CoreText.h>
-#include "FontDescriptor.h"
+#include "../FontDescriptor.h"
 
 // converts a CoreText weight (-1 to +1) to a standard weight (100 to 900)
 static int convertWeight(float weight) {

src/unix/FontManagerLinux.cpp

@@ -1,5 +1,5 @@
 #include <fontconfig/fontconfig.h>
-#include "FontDescriptor.h"
+#include "../FontDescriptor.h"
 
 int convertWeight(FontWeight weight) {
   switch (weight) {