✨ Make Homebrew install stuff

git/install.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# vim:set ft=bash:
+
+cd "$(dirname "${BASH_SOURCE[0]}")" \
+  && . "../homebrew/brew_utils.sh"
+
+brew_install "Git" "git"
+brew_install "Github CLI" "gh"
+brew_install "Gitmoji" "gitmoji"

homebrew/brew_utils.sh

@@ -0,0 +1,70 @@
+#!/user/bin/env bash
+
+cd "$(dirname "${BASH_SOURCE[0]}")" \
+  && . "../script/utils.sh"
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+brew_prefix()
+{
+  local path=""
+
+  if path="$(brew --prefix 2>/dev/null)"; then
+    printf "%s" "$path"
+    return 0
+  else
+    print_error "Homebrew (get prefix)"
+    return 1
+  fi
+}
+
+brew_tap()
+{
+  brew tap "$1" &>/dev/null
+}
+
+brew_update()
+{
+  execute "brew update" "Homebrew (update)"
+}
+
+brew_upgrade()
+{
+  execute "brew upgrade" "Homebrew (upgrade)"
+}
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+brew_install()
+{
+  declare -r FORMULA_READABLE_NAME="$1"
+  declare -r FORMULA="$2"
+  declare -r ARGUMENTS="$3"
+  declare -r TAP_VALUE="$4"
+
+  # Check that Homebrew is installed.
+
+  if ! cmd_exists "brew"; then
+    print_error "$FORMULA_READABLE_NAME ('Homebrew' is not installed)"
+    return 1
+  fi
+
+  # If 'brew tap' needs to be executed, check if it executed correctly.
+
+  if [[ -n "$TAP_VALUE" ]]; then
+    if ! brew_tap "$TAP_VALUE"; then
+      print_error "$FORMULA_READABLE_NAME ('brew tap $TAP_VALUE' failed)"
+      return 1
+    fi
+  fi
+
+  # Install the specified formula.
+
+  # shellcheck disable=SC2086
+  if brew list "$FORMULA" &>/dev/null; then
+    print_success "$FORMULA_READABLE_NAME"
+  else
+    execute "brew install $FORMULA $ARGUMENTS" \
+      "$FORMULA_READABLE_NAME"
+  fi
+}

homebrew/install_once.sh

@@ -1,11 +0,0 @@
-#!/user/bin/env bash
-# vim:set ft=bash:
-
-install_once()
-{
-  if brew ls --versions "$1"; then
-    brew upgrade "$1"
-  else
-    brew install "$1"
-  fi
-}

zsh/install.sh

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # vim:set ft=bash:
 
-source $DOT/homebrew/install_once.sh
+cd "$(dirname "${BASH_SOURCE[0]}")" \
+  && . "../homebrew/brew_utils.sh"
 
-install_once starship
+brew_install "Starship Prompt" "starship"