feat: migrate from homebrew to nix with home-manager

.aliases

@@ -302,8 +302,19 @@ if [[ $OS == 'Darwin' ]]; then
   # Stopwatch
   alias timer='echo "Timer started. Stop with Ctrl-D." && date && time cat && date'
 
-  # Get OS X Software Updates, and update installed Ruby gems, Homebrew, npm, and their installed packages
-  alias update='sudo softwareupdate -i -a; brew update; brew upgrade; brew cleanup; npm install npm -g; npm update -g; sudo gem update --system; sudo gem update'
+  # Get OS X Software Updates and apply nix-darwin / home-manager changes
+  update() {
+    sudo softwareupdate -i -a
+    if command -v darwin-rebuild &>/dev/null; then
+      nix flake update --flake ~/.dotfiles
+      darwin-rebuild switch --flake ~/.dotfiles
+    elif command -v nix &>/dev/null; then
+      nix flake update --flake ~/.dotfiles
+      home-manager switch --flake ~/.dotfiles
+    fi
+    npm install npm -g && npm update -g
+    sudo gem update --system && sudo gem update
+  }
 
   # IP addresses
   alias ip="dig +short myip.opendns.com @resolver1.opendns.com"

.bashrc

@@ -46,11 +46,23 @@ if [ -r /etc/profile.d/bash_completion.sh ]; then
   source /etc/profile.d/bash_completion.sh
 fi
 
-# brew
+# nix & home-manager
+if [ -e "${HOME}/.nix-profile/etc/profile.d/hm-session-vars.sh" ]; then
+  # shellcheck disable=SC1091
+  source "${HOME}/.nix-profile/etc/profile.d/hm-session-vars.sh"
+fi
+
+# brew (managed by nix-darwin on macOS)
 if command -v brew &>/dev/null; then
   eval "$(brew shellenv)"
 fi
 
+# bash completions — Nix profile
+if [ -r "${HOME}/.nix-profile/etc/profile.d/bash_completion.sh" ]; then
+  # shellcheck disable=SC1091
+  source "${HOME}/.nix-profile/etc/profile.d/bash_completion.sh"
+fi
+
 # https://docs.brew.sh/Shell-Completion
 if [ -r "${HOMEBREW_PREFIX}/etc/profile.d/bash_completion.sh" ]; then
   export BASH_COMPLETION_COMPAT_DIR="${HOMEBREW_PREFIX}/etc/bash_completion.d"
@@ -67,14 +79,21 @@ fi
 PROMPT_COMMAND="history -a;$PROMPT_COMMAND"
 
 # chruby
-if [ -f "${HOMEBREW_PREFIX}/share/chruby/chruby.sh" ]; then
+CHRUBY_DIR=""
+if [ -f "${HOME}/.nix-profile/share/chruby/chruby.sh" ]; then
+  CHRUBY_DIR="${HOME}/.nix-profile/share/chruby"
+elif [ -f "${HOMEBREW_PREFIX}/share/chruby/chruby.sh" ]; then
+  CHRUBY_DIR="${HOMEBREW_PREFIX}/share/chruby"
+fi
+
+if [ -n "$CHRUBY_DIR" ]; then
   # shellcheck disable=SC2034
   RUBIES=("${HOME}/.rubies/*")
 
   # shellcheck source=/dev/null
-  source "${HOMEBREW_PREFIX}/share/chruby/chruby.sh"
+  source "${CHRUBY_DIR}/chruby.sh"
   # shellcheck source=/dev/null
-  source "${HOMEBREW_PREFIX}/share/chruby/auto.sh"
+  source "${CHRUBY_DIR}/auto.sh"
 fi
 
 if command -v zoxide &>/dev/null; then
@@ -86,7 +105,7 @@ if command -v direnv &>/dev/null; then
 fi
 
 # gcloud
-# For Homebrew-installed gcloud-cli
+# gcloud-cli is managed by nix-darwin's Homebrew module on macOS
 if command -v brew &>/dev/null; then
   GCLOUD_SDK="${HOMEBREW_PREFIX}/share/google-cloud-sdk"
   if [ -f "${GCLOUD_SDK}/path.bash.inc" ] &&

.gitignore

@@ -6,3 +6,5 @@
 .config
 .gnupg/
 nvim.appimage
+result
+.direnv

.profile

@@ -1,7 +1,16 @@
+# Nix
+if [ -e "${HOME}/.nix-profile/etc/profile.d/nix.sh" ]; then
+  # shellcheck disable=SC1091
+  . "${HOME}/.nix-profile/etc/profile.d/nix.sh"
+elif [ -e '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh' ]; then
+  # shellcheck disable=SC1091
+  . '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'
+fi
+
 # PATH
-export PATH="$HOME/.homebrew/bin:$HOME/.homebrew/sbin:$HOME/bin:/usr/local/bin:/usr/local/sbin:$PATH"
+export PATH="$HOME/.nix-profile/bin:$HOME/.homebrew/bin:$HOME/.homebrew/sbin:$HOME/bin:/usr/local/bin:/usr/local/sbin:$PATH"
 
-# Homebrew prefix
+# Homebrew prefix (managed by nix-darwin on macOS)
 export HOMEBREW_PREFIX='/usr/local'
 if command -v brew >/dev/null 2>&1; then
   HOMEBREW_PREFIX="$(brew --prefix)"
@@ -54,7 +63,7 @@ elif less_pipe=$(command -v lesspipe.sh); then
 fi
 
 # man
-export MANPATH="$HOME/.homebrew/share/man${MANPATH+:$MANPATH}:"
+export MANPATH="$HOME/.nix-profile/share/man:$HOME/.homebrew/share/man${MANPATH+:$MANPATH}:"
 
 # Don't clear the screen after quitting a manual page
 export MANPAGER='less -X'
@@ -101,7 +110,9 @@ if [ ! -d "$TMPDIR" ]; then
 fi
 
 # diff-highligh
-if [ -d "${HOMEBREW_PREFIX}/share/git-core/contrib/diff-highlight/" ]; then
+if [ -d "${HOME}/.nix-profile/share/git-core/contrib/diff-highlight/" ]; then
+  export PATH="${PATH}:${HOME}/.nix-profile/share/git-core/contrib/diff-highlight"
+elif [ -d "${HOMEBREW_PREFIX}/share/git-core/contrib/diff-highlight/" ]; then
   export PATH="${PATH}:${HOMEBREW_PREFIX}/share/git-core/contrib/diff-highlight"
 fi