Use ZDOTDIR env variable for path to .zshrc

.zshrc can be found at "~/.zshrc", when ZDOTDIR is not set.
If ZDOTDIR is set, .zshrc is in "${ZDOTDIR}/.zshrc".
Using parameter expansion, the hardcoded path can be replaced with
"${ZDOTDIR:-$HOME}/.zshrc". That way, it'll use the value in
ZDOTDIR when set and the value in HOME when not.
This thus mirrors the usage of ZDOTDIR in zsh and makes the code
more fexible.

README.md

@@ -29,7 +29,7 @@ features.
 ```bash
 git clone git://github.com/scmbreeze/scm_breeze.git ~/.scm_breeze
 ~/.scm_breeze/install.sh
-source ~/.bashrc   # or source ~/.zshrc
+source ~/.bashrc   # or source "${ZDOTDIR:-$HOME}/.zshrc"
 ```
 
 The install script creates required default configs and adds the following line
@@ -253,7 +253,7 @@ default base subdirectories are: Images, Backgrounds, Logos, Icons, Mockups,
 and Screenshots.
 
 After you have changed these settings, remember to run `source ~/.bashrc` or
-`source ~/.zshrc`.
+`source "${ZDOTDIR:-$HOME}/.zshrc"`.
 
 
 #### 2) Initialize design directories for your projects
@@ -324,7 +324,7 @@ Each feature is modular, so you are free to ignore the parts you don't want to
 use.  Just comment out the relevant line in `~/.scm_breeze/scm_breeze.sh`.
 
 **Note:** After changing any settings, you will need to run `source ~/.bashrc`
-(or `source ~/.zshrc`)
+(or `source "${ZDOTDIR:-$HOME}/.zshrc"`)
 
 I know we grow attached to the aliases we use every day, so I've made the alias
 system completely customizable.  You have two options when it comes to aliases:

install.sh

@@ -10,10 +10,10 @@ fi
 # This loads SCM Breeze into the shell session.
 exec_string="[ -s \"$HOME/.scm_breeze/scm_breeze.sh\" ] && source \"$HOME/.scm_breeze/scm_breeze.sh\""
 
-# Add line to bashrc, zshrc, and bash_profile if not already present.
+# Add line to bashrc and bash_profile if not already present.
 added_to_profile=false
 already_present=false
-for rc in bashrc zshrc bash_profile; do
+for rc in bashrc bash_profile; do
   if [ -s "$HOME/.$rc" ]; then
     if grep -q "$exec_string" "$HOME/.$rc"; then
       printf "== Already installed in '~/.$rc'\n"
@@ -26,13 +26,27 @@ for rc in bashrc zshrc bash_profile; do
   fi
 done
 
+# Add line to .zshrc if not aleady present.
+# When set, the ZDOTDIR environment variable states the directory zshrc is in.
+# If not set, HOME environment variable is used as fallback.
+if [ -s "${ZDOTDIR:-$HOME}/.zshrc" ]; then
+  if grep -q "$exec_string" "${ZDOTDIR:-$HOME}/.zshrc"; then
+    printf "== Already installed in '${ZDOTDIR:-$HOME}/.zshrc'\n"
+    already_present=true  
+  else
+    printf "\n$exec_string\n" >> "${ZDOTDIR:-$HOME}/.zshrc"
+    printf "== Added SCM Breeze to '${ZDOTDIR:-$HOME}/.zshrc'\n"
+    already_present=true
+  fi
+fi
+
 # Load SCM Breeze update scripts
 source "$scmbDir/lib/scm_breeze.sh"
 # Create '~/.*.scmbrc' files from example files
 _create_or_patch_scmbrc
 
 if [ "$added_to_profile" = true ] || [ "$already_present" = true ]; then
-  echo "== SCM Breeze Installed! Run 'source ~/.bashrc || source ~/.bash_profile' or 'source ~/.zshrc'"
+  echo "== SCM Breeze Installed! Run 'source ~/.bashrc || source ~/.bash_profile' or 'source \"${ZDOTDIR:-$HOME}/.zshrc\"'"
   echo "   to load SCM Breeze into your current shell."
 else
   echo "== Error:"

uninstall.sh

@@ -7,9 +7,12 @@ if [[ $OSTYPE == "Darwin" ]]; then
   sed="sed -i ''"
 fi
 
-for rc in bashrc zshrc; do
-  if [ -f "$HOME/.$rc" ]; then
-    $sed '/scm_breeze/d' "$HOME/.$rc" &&
-      printf "Removed SCM Breeze from %s\n" "$HOME/.$rc"
-  fi
-done
+if [ -f "$HOME/.bashrc" ]; then
+  $sed '/scm_breeze/d' "$HOME/.bashrc" &&
+  printf "Removed SCM Breeze from '%s'\n" "$HOME/.bashrc"
+fi
+
+if [ -f "${ZDOTDIR:-$HOME}/.zshrc" ]; then
+  $sed '/scm_breeze/d' "${ZDOTDIR:-$HOME}/.zshrc" &&
+  printf "Removed SCM Breeze from '%s'\n" "${ZDOTDIR:-$HOME}/.zshrc" 
+fi