installdeps: minor refactoring/cleanup

Break command line argument processing and OS detection off into
functions called from `main()`.

Remove all references to cairo.

For fink, install the SFML package I made instead of turning off link.

installdeps

 #!/bin/sh
 
-cmake=cmake
+CMAKE=cmake
 
 main() {
     cd "$(dirname $0)"
 
+    check_command_line_args "$@"
+
+    target=$1
+
+    mktmp
+
+    check_os
+
+    ${os}_installdeps
+
+    quit 0
+}
+
+check_command_line_args() {
     while [ $# -gt 0 ]; do
         case "$1" in
             -h|--help|--usage)
@@ -21,30 +35,23 @@ main() {
         usage
         quit 1
     fi
+}
 
-    target=$1
-
-    mktmp
-
+check_os() {
     case "$(uname -s)" in
         Linux)
             os=linux
-            linux_installdeps
             ;;
         Darwin)
             os=mac
-            osx_installdeps
             ;;
         MINGW*|MSYS*)
             os=windows
-            msys2_installdeps
             ;;
         *)
             error "Don't know how to install deps on your OS"
             ;;
     esac
-
-    quit 0
 }
 
 mktmp() {
@@ -265,7 +272,7 @@ debian_installdeps() {
 
     if [ -z "$target" ]; then
         check sudo apt-get -qq update
-        check sudo apt-get -qy install build-essential g++ nasm cmake gettext zlib1g-dev libgl1-mesa-dev libavcodec-dev libavformat-dev libswscale-dev libavutil-dev libgettextpo-dev libpng-dev libsdl2-dev libsfml-dev libopenal-dev libwxgtk3.0-dev libgtk2.0-dev libgtk-3-dev libcairo2-dev
+        check sudo apt-get -qy install build-essential g++ nasm cmake gettext zlib1g-dev libgl1-mesa-dev libavcodec-dev libavformat-dev libswscale-dev libavutil-dev libgettextpo-dev libpng-dev libsdl2-dev libsfml-dev libopenal-dev libwxgtk3.0-dev libgtk2.0-dev libgtk-3-dev
     else
         case "$target" in
             mingw-w64-i686)
@@ -279,7 +286,7 @@ debian_installdeps() {
                 ;;
         esac
 
-        cmake="/usr/lib/mxe/usr/bin/${target}-cmake"
+        CMAKE="/usr/lib/mxe/usr/bin/${target}-cmake"
 
         mxe_apt_sources='/etc/apt/sources.list.d/mxeapt.list'
 
@@ -294,7 +301,7 @@ debian_installdeps() {
         fi
 
         set --
-        for dep in gcc zlib ffmpeg gettext sdl2 sfml openal wxwidgets cairo; do
+        for dep in gcc zlib ffmpeg gettext sdl2 sfml openal wxwidgets; do
             set -- "$@" "mxe-${target}-$dep"
         done
         check sudo apt-get -qy install build-essential cmake "$@"
@@ -369,7 +376,7 @@ fedora_installdeps() {
             # this is sometimes necessary for rawhide
             set -- --exclude='glibc32*'
         fi
-        for pkg in zlib-devel mesa-libGL-devel ffmpeg-devel gettext-devel libpng-devel SDL2-devel SFML-devel openal-soft-devel wxGTK3-devel cairo-devel gtk2-devel gtk3-devel; do
+        for pkg in zlib-devel mesa-libGL-devel ffmpeg-devel gettext-devel libpng-devel SDL2-devel SFML-devel openal-soft-devel wxGTK3-devel gtk2-devel gtk3-devel; do
             case $pkg in
                 *ffmpeg*)
                     [ -n $no_ffmpeg ] && continue
@@ -415,7 +422,7 @@ fedora_installdeps() {
                 ;;
         esac
         # install static deps
-        for pkg in zlib gettext libpng SDL2 wxWidgets cairo; do
+        for pkg in zlib gettext libpng SDL2 wxWidgets; do
             set -- "$@" "${target}-${pkg}-static"
         done
         # install deps that are not available as static
@@ -481,7 +488,7 @@ archlinux_installdeps() {
     # not using the base-devel group because it can break gcc-multilib
     check $pacman --noconfirm --needed -S binutils file grep gawk gzip libtool make patch sed util-linux nasm cmake pkg-config git
 
-    libs="zlib mesa cairo gettext libpng sdl2 openal wxgtk gtk2 gtk3 sfml ffmpeg"
+    libs="zlib mesa gettext libpng sdl2 openal wxgtk gtk2 gtk3 sfml ffmpeg"
 
     if [ -z "$target" -o "$target" = m32 ]; then
         if [ -z "$target" -o -z "$amd64" ]; then
@@ -657,7 +664,7 @@ solus_installdeps() {
     build_instructions
 }
 
-msys2_installdeps() {
+windows_installdeps() {
     msys2=1
 
     check_cross
@@ -667,7 +674,7 @@ msys2_installdeps() {
     check pacman -Sy
 
     set --
-    for p in SDL2 cairo ffmpeg openal sfml wxWidgets zlib binutils cmake crt-git extra-cmake-modules gcc gcc-libs gdb headers-git make pkg-config tools-git windows-default-manifest libmangle-git nasm; do
+    for p in SDL2 ffmpeg openal sfml wxWidgets zlib binutils cmake crt-git extra-cmake-modules gcc gcc-libs gdb headers-git make pkg-config tools-git windows-default-manifest libmangle-git nasm; do
         set -- "$@" "${target}-${p}"
     done
 
@@ -695,7 +702,7 @@ cd $(pwd)"
     build_instructions
 }
 
-osx_installdeps() {
+mac_installdeps() {
     if ! xcode-select -p >/dev/null 2>&1 && \
        ! pkgutil --pkg-info=com.apple.pkg.CLTools_Executables >/dev/null 2>&1 && \
        ! pkgutil --pkg-info=com.apple.pkg.DeveloperToolsCLI >/dev/null 2>&1; then
@@ -721,7 +728,7 @@ brew_installdeps() {
     check brew -v update
 
     set --
-    for f in cairo nasm cmake ffmpeg gettext libpng pkg-config sdl2 sfml wxmac; do
+    for f in nasm cmake ffmpeg gettext libpng pkg-config sdl2 sfml wxmac; do
         if brew info "$f" | grep -Eq '^Not installed$'; then
             set -- "$@" "$f"
         fi
@@ -738,7 +745,7 @@ macports_installdeps() {
     installing
 
     check sudo port -v selfupdate
-    check sudo port -v install cairo cmake nasm ffmpeg gettext libpng pkgconfig libsdl2 sfml wxWidgets-3.0 libiconv
+    check sudo port -v install cmake nasm ffmpeg gettext libpng pkgconfig libsdl2 sfml wxWidgets-3.0 libiconv
     check sudo port select wxWidgets wxWidgets-3.0
 
     build_instructions
@@ -749,11 +756,7 @@ fink_installdeps() {
     installing
 
     check sudo fink -vy selfupdate
-    check sudo fink -vy install cairo cmake nasm ffmpeg libgettext8-dev gettext-tools libpng16 pkgconfig sdl2 wxwidgets300-osxcocoa libiconv-dev
-
-    warning 'SFML is required for LINK support, there is currently no SFML package for Fink, if you want LINK support you will need to install it manually'
-
-    cmake_flags="$cmake_flags -DENABLE_LINK=NO"
+    check sudo fink -vy install cmake nasm ffmpeg libgettext8-dev gettext-tools libpng16 pkgconfig sdl2 wxwidgets300-osxcocoa libiconv-dev sfml24-dev
 
     build_instructions
 }
@@ -765,7 +768,7 @@ build_instructions() {
 
 $pre_build
 mkdir -p build && cd build
-$cmake .. $cmake_flags
+$CMAKE .. $cmake_flags
 make $(jobs_flag)
 $post_build