Add support for fish shell

This commit also:

- Set NODE_PATH with `npm root -g`.
- Removes call to `manpath`. This script should not be responsible for
  loading OS manual pages.
- Create ${npmdir}/bin so fish_add_path doesn't fail.

npm-g-nosudo.sh

@@ -96,6 +96,7 @@ fi
 
 if [ 0 = ${DEBUG} ];    then
     mkdir -p ${npmdir}
+    mkdir ${npmdir}/bin
     npm config set prefix $npmdir
 fi
 
@@ -121,13 +122,19 @@ if [ -s $to_reinstall ]; then
 fi
 
 envfix='
+# exports for Node.js (generated by npm-g-nosudo.sh)
 export NPM_PACKAGES="%s"
-export NODE_PATH="$NPM_PACKAGES/lib/node_modules${NODE_PATH:+:$NODE_PATH}"
 export PATH="$NPM_PACKAGES/bin:$PATH"
-# Unset manpath so we can inherit from /etc/manpath via the `manpath`
-# command
-unset MANPATH  # delete if you already modified MANPATH elsewhere in your config
-export MANPATH="$NPM_PACKAGES/share/man:$(manpath)"
+export MANPATH="$NPM_PACKAGES/share/man:$MANPATH"
+export NODE_PATH="$(npm root -g)"
+'
+
+envfix_fish='
+# exports for Node.js (generated by npm-g-nosudo.sh)
+set -gx NPM_PACKAGES "%s"
+fish_add_path $NPM_PACKAGES/bin
+set -gx MANPATH $NPM_PACKAGES/share/man $MANPATH
+set -gx NODE_PATH (npm root -g)
 '
 
 fix_env() {
@@ -139,12 +146,17 @@ fix_env() {
         printf "${envfix}" ${npmdir} >> ~/.zshrc
         printf "\nDon't forget to run 'source ~/.zshrc'\n"
     fi
-
+    if [ -d "${HOME}/.config/fish/conf.d" ]; then
+        printf "${envfix_fish}" ${npmdir} >> ~/.config/fish/conf.d/nodejs_path_setup.fish
+        printf "\nDon't forget to run 'source ~/.config/fish/conf.d/nodejs_path_setup.fish'\n"
+    fi
 }
 
 echo_env() {
     printf "\nYou may need to add the following to your ~/.bashrc / .zshrc file(s)\n\n"
     printf "${envfix}\n\n" ${npmdir}
+    printf "\nOr the following to your ~/.config/fish/config.fish file\n\n"
+    printf "${envfix_fish}\n\n" ${npmdir}
 }
 
 printf "\n\n"