zsh: add master->main dotfiles migration

brethil_dotfile.sh

@@ -9,15 +9,29 @@ export VIRTUAL_ENV_DISABLE_PROMPT=true
 
 export PATH=$PATH:$HOME/bin
 
-if [[ -d "$HOME/.cache/antibody" ]]; then
-  # antibody migration cleanup
-  rm -rf $HOME/.cache/antibody
-fi
+( # main branch migration
+  set -euo pipefail
+  cd $DOTFILES
+  if [[ $(git branch --show-current) == "master" ]]; then
+    echo "Migrating to main branch..."
+    git fetch
+    git stash
+    git switch main
+    git stash pop
+    git branch -D master
+    echo "Migration done!"
+  fi
+)
 
 if [[ ! -d $DOTFILES/antidote ]]; then
   git clone https://github.com/mattmc3/antidote.git ${DOTFILES}/antidote
 fi
 
+if [[ -d "$HOME/.cache/antibody" ]]; then
+  # antibody migration cleanup
+  rm -rf $HOME/.cache/antibody
+fi
+
 export ZSH_CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/oh-my-zsh"
 [[ -d $ZSH_CACHE_DIR ]] || mkdir -p $ZSH_CACHE_DIR/completions