Creates umbrella commands for all Linux packages and adds support for Arch Linux' package manager pacman

Signed-off-by: Andrey Shovkoplyas <motor4ik@gmail.com>

scripts/lib/setup/installers.sh

@@ -30,7 +30,7 @@ function install_and_setup_package_manager() {
     )
 
     for package in "${buildtools[@]}"; do
-      apt_install "$package"
+      linux_install "$package"
     done
   fi
 }
@@ -138,7 +138,7 @@ function install_android_sdk_linux() {
 
 function install_maven() {
   brew_install maven
-  apt_install maven
+  linux_install maven
 }
 
 function install_react_native_cli() {
@@ -184,9 +184,9 @@ function install_node_via_package_manager() {
       brew_install node
     elif is_linux; then
       curl -sL https://deb.nodesource.com/setup_9.x | sudo -E bash -
-      apt_update
+      linux_update
 
-      apt_install nodejs
+      linux_install nodejs
     fi
   else
     cecho \

scripts/lib/setup/packages.sh

@@ -9,6 +9,8 @@ function program_exists() {
   command -v "$program" >/dev/null 2>&1
 }
 
+
+
 ########
 # Homebrew
 ########
@@ -53,28 +55,68 @@ function brew_tap() {
   fi
 }
 
+###############
+# Linux
+###############
+
+function linux_update() {
+    ! is_linux && return 1
+
+    if program_exists "apt"; then
+        apt_update
+    elif program_exists "pacman"; then
+        pacman_update
+    else
+        echo "Unsupported Linux distro."
+        exit 1;
+    fi
+}
+
+function linux_is_installed() {
+    ! is_linux && return 1
+
+    if program_exists "apt"; then
+        apt_is_installed "$@"
+    elif program_exists "pacman"; then
+        pacman_is_installed "$@"
+    else
+        echo "Unsupported Linux distro."
+        exit 1;
+    fi
+}
+
+# FIXME This command assumes that package names in different package managers (apt, pacman) are same.
+# At this moment, it works as expected because we only call it for installing maven and nodejs.
+# If this list grows, please consider adding some sort of mapping mechanism.
+function linux_install() {
+    ! is_linux && return 1
+
+    if program_exists "apt"; then
+        apt_install "$@"
+    elif program_exists "pacman"; then
+        pacman_install "$@"
+    else
+        echo "Unsupported Linux distro."
+        exit 1;
+    fi
+}
+
 
 ###############
 # Aptitude
 ###############
 
 function apt_update() {
-  ! is_linux && return 1
-
   sudo apt update
 }
 
 function apt_is_installed() {
-  ! is_linux && return 1
-
   local package=$1
 
   dpkg -s "$package" >/dev/null 2>&1
 }
 
 function apt_install() {
-  ! is_linux && return 1
-
   local package=$1
 
   if apt_is_installed "$package"; then
@@ -84,6 +126,29 @@ function apt_install() {
   fi
 }
 
+###############
+# Pacman
+###############
+
+function pacman_update() {
+    sudo pacman -Syu
+}
+
+function pacman_is_installed() {
+    local package=$1
+    pacman -Qs $package >/dev/null 2>&1
+}
+
+function pacman_install() {
+    local package=$1
+
+    if pacman_is_installed "$package"; then
+        cecho "+ $package already installed... skipping."
+    else
+        sudo pacman -S --noconfirm "$package"
+    fi
+}
+
 ###############
 # RVM
 ###############