Initial commit of proxy plugin

plugins/proxy/README.md

+proxy plugin
+============
+
+The proxy plugin provides a couple helper functions to those of us who are
+stuck behind HTTP/HTTPS/FTP proxies that require authentication.
+
+## Usage
+
+In all cases you will need to add 'proxy' to your fish_plugins list in
+config.fish
+
+### No authentication
+
+If you just want to have the proxy plugin configure all the environment
+variables, you may set proxy_host:
+
+    set proxy_host myproxy.example.com:8000
+
+The proxy plugin will prepend `http://` for you.  Here's the result:
+
+    ~> set -x |grep proxy
+    ALL_PROXY http://myproxy.example.com:8000
+    FTP_PROXY http://myproxy.example.com:8000
+    HTTPS_PROXY http://myproxy.example.com:8000
+    HTTP_PROXY http://myproxy.example.com:8000
+    NO_PROXY http://myproxy.example.com:8000
+    all_proxy http://myproxy.example.com:8000
+    ftp_proxy http://myproxy.example.com:8000
+    http_proxy http://myproxy.example.com:8000
+    https_proxy http://myproxy.example.com:8000
+    no_proxy http://myproxy.example.com:8000
+
+### With authentication
+
+Set your proxy host and username:
+
+    set proxy_host myproxy.example.com:8000
+    set proxy_user mylogin
+
+When you need to make use of the proxy, just run `proxy`.  It will prompt you
+for a password and setup your environment.
+
+If you didn't setup a proxy_user variable, you will be prompted for a username.
+
+If you wish to clear your proxy variables, run `noproxy`.

plugins/proxy/_proxy_set.fish

+function _proxy_set -a proxy \
+  -d "Set all proxy vars to specified value"
+
+  set -l envars http_proxy ftp_proxy https_proxy all_proxy no_proxy \
+    HTTP_PROXY HTTPS_PROXY FTP_PROXY NO_PROXY ALL_PROXY
+  for envar in $envars
+    if test $proxy = '-e'
+      set -e $envar
+    else
+      set -gx $envar $proxy
+    end
+  end
+end

plugins/proxy/noproxy.fish

+function noproxy -d "Clear all proxy environment variables"
+  _proxy_set -e
+end

plugins/proxy/proxy.fish

+function proxy -d "Setup proxy environment variables"
+  if not set -q proxy_host
+    echo "Error: You must set proxy_host to your proxy hostname:port in config.fish"
+    echo "You may also set proxy_user to your username"
+    return
+  end
+
+  # Get user & password
+  set -l user $proxy_user
+  if not set -q proxy_user
+    read -p "echo -n 'Proxy User: '" user
+  end
+  # Hacky way to read password in fish
+  echo -n 'Proxy Password: '
+  stty -echo
+  head -n 1 - | read -l pass
+  stty echo
+  echo
+  # URL encode password
+  set -l chars (echo $pass | sed -E -e 's/./\n\\0/g;/^$/d;s/\n//')
+  printf '%%%02x' "'"$chars"'" | read -l encpass
+
+  _proxy_set "http://$user:$encpass@$proxy_host"
+end
+

plugins/proxy/proxy.load

+# Initial proxy setup (no username/password)
+_proxy_set "http://$proxy_host"