Added R methods and their c counterparts for connection and database management

configure

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+# Anticonf script by Jeroen Ooms (2020)
+# The script will try 'mariadb_config' and 'mysql_config' to find required
+# cflags and ldflags. Make sure this executable is in PATH when installing
+# the package. Alternatively, you can set INCLUDE_DIR and LIB_DIR manually:
+# R CMD INSTALL --configure-vars='INCLUDE_DIR=/.../include LIB_DIR=/.../lib'
+
+# Library settings
+PKG_DEB_NAME="libmariadbclient-dev | libmariadb-client-lgpl-dev"
+PKG_RPM_NAME="mariadb-connector-c-devel | mariadb-devel | mysql-devel"
+PKG_CSW_NAME="mysql56_dev"
+PKG_BREW_NAME="mariadb-connector-c"
+PKG_TEST_HEADER="<mysql.h>"
+PKG_LIBS="-lmysqlclient"
+
+# Use mysql_config (on Solaris /opt/csw/bin must be in PATH)
+if [ $(command -v mariadb_config) ]; then
+  PKGCONFIG_CFLAGS=$(mariadb_config --cflags)
+  PKGCONFIG_LIBS=$(mariadb_config --libs)
+elif [ $(command -v mysql_config) ]; then
+  PKGCONFIG_CFLAGS=$(mysql_config --cflags)
+  PKGCONFIG_LIBS=$(mysql_config --libs)
+fi
+
+# Note that cflags may be empty in case of success
+if [ "$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" ] || [ "$PKGCONFIG_LIBS" ]; then
+  echo "Found mysql_config cflags and libs!"
+  PKG_CFLAGS=${PKGCONFIG_CFLAGS}
+  PKG_LIBS=${PKGCONFIG_LIBS}
+  # Workaround for homebrew linkin bug
+  if [[ "$OSTYPE" == "darwin"* ]]; then
+    PKG_LIBS="-L/usr/local/opt/openssl/lib $PKG_LIBS"
+  fi
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  if [ $(command -v brew) ]; then
+    BREWDIR=$(brew --prefix)
+  else
+    curl -sfL "https://jeroen.github.io/autobrew/$PKG_BREW_NAME" > autobrew
+    source autobrew
+  fi
+fi
+
+# Find compiler
+CC=$(${R_HOME}/bin/R CMD config CC)
+CFLAGS=$(${R_HOME}/bin/R CMD config CFLAGS)
+CPPFLAGS=$(${R_HOME}/bin/R CMD config CPPFLAGS)
+
+# For debugging
+echo "Using PKG_CFLAGS=$PKG_CFLAGS"
+echo "Using PKG_LIBS=$PKG_LIBS"
+
+# Test configuration
+echo "#include $PKG_TEST_HEADER" | ${CC} ${CPPFLAGS} ${PKG_CFLAGS} ${CFLAGS} -E -xc - >/dev/null 2> configure.log
+
+# Customize the error
+if [ $? -ne 0 ]; then
+  echo "-----------------------------[ ANTICONF ]-----------------------------"
+  echo "Configure could not find suitable mysql/mariadb client library. Try installing:"
+  echo " * deb: $PKG_DEB_NAME (Debian, Ubuntu)"
+  echo " * rpm: $PKG_RPM_NAME (Fedora, CentOS, RHEL)"
+  echo " * csw: $PKG_CSW_NAME (Solaris)"
+  echo " * brew: $PKG_BREW_NAME (OSX)"
+  echo "If you already have a mysql client library installed, verify that either"
+  echo "mariadb_config or mysql_config is on your PATH. If these are unavailable"
+  echo "you can also set INCLUDE_DIR and LIB_DIR manually via:"
+  echo "R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'"
+  echo "--------------------------[ ERROR MESSAGE ]----------------------------"
+  cat configure.log
+  echo "-----------------------------------------------------------------------"
+  exit 1
+fi
+
+# Write to Makevars
+sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars
+
+# Success
+exit 0