Improve Arch Linux support in ext scripts

ext/setup-csharp.sh

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 
-cd ~/.emacs.d/ext
-source ./VARS
+source VARS
 
 #
 echo "Setting up C# (omnisharp)"

ext/setup-rust.sh

@@ -1,11 +1,23 @@
 #!/usr/bin/env bash
 
-cd ~/.emacs.d/ext
-source ./VARS
+source VARS
 
 #
 echo "Setting up Rust"
 
+case "$OSTYPE" in
+    darwin*)
+        brew install rust
+        ;;
+    linux*)
+        if is-arch; then
+            sudo pacman --noconfirm -S rust cargo
+        elif is-deb; then
+            echo ...
+            exit 1
+        fi
+esac
+
 git-repo "https://github.com/rust-lang/rust.git" "rust"
 git-repo "https://github.com/phildawes/racer.git" "racer-src"
 

ext/setup-sh.sh

@@ -1,11 +1,12 @@
 #!/usr/bin/env bash
 
-cd ~/.emacs.d/ext
-source ./VARS
+source VARS
 
 #
 echo "Setting up zsh/bash (zshdb, bashdb)"
 
 if is-mac; then
     brew install zshdb bashdb
+elif is-arch; then
+    sudo pacman --noconfirm -S zshdb bashdb
 fi