fish: add homebrew functions

fish/functions/brew_installed.fish

@@ -0,0 +1,15 @@
+function brew_installed --description "List installed top-level formulas"
+  set --local __brew_pkgs ''
+  set --local __brew_deps ''
+
+  for __brew_pkg in (brew deps --installed)
+    set __brew_pkgs $__brew_pkgs (string split ':' $__brew_pkg | head -n 1)
+    set __brew_deps $__brew_deps (string split ' ' (string split ':' $__brew_pkg | tail -n +2))
+  end
+
+  for __brew_pkg in $__brew_pkgs
+    if not contains $__brew_pkg $__brew_deps
+      echo $__brew_pkg
+    end
+  end
+end

fish/functions/brew_remove.fish

@@ -0,0 +1,7 @@
+function brew_remove --description "Select homebrew packages to remove"
+  set --local pkgs (brew leaves | eval "fzf $FZF_DEFAULT_OPTS --multi --header='[brew:uninstall]'")
+
+  if not test (count $pkgs) = 0
+    brew uninstall $pkgs
+  end
+end

fish/functions/brew_search.fish

@@ -0,0 +1,7 @@
+function brew_search --description "Find homebrew packages to install"
+  set --local pkgs (brew search | eval "fzf $FZF_DEFAULT_OPTS --multi --header='[brew:install]'")
+
+  if not test (count $pkgs) = 0
+    brew install $pkgs
+  end
+end