diff --git a/users/jrpotter/neovim/config/utils/fmt.lua b/users/jrpotter/neovim/config/utils/fmt.lua
new file mode 100644
index 0000000..962c98f
--- /dev/null
+++ b/users/jrpotter/neovim/config/utils/fmt.lua
@@ -0,0 +1,13 @@
+local M = {}
+
+function M.set_fmt_map()
+  vim.keymap.set('v', 'g|', function()
+    local width = vim.bo.textwidth
+    if width == 0 and vim.w.colorcolumn then
+      width = tonumber(vim.w.colorcolumn:match("[^,]+"))
+    end
+    return string.format("!par w%d<cr>", width ~= 0 and width or 80)
+  end, { expr = true })
+end
+
+return M
diff --git a/users/jrpotter/neovim/default.nix b/users/jrpotter/neovim/default.nix
index 290a2b3..64b87e8 100644
--- a/users/jrpotter/neovim/default.nix
+++ b/users/jrpotter/neovim/default.nix
@@ -119,6 +119,7 @@ in
 
   config = {
     home.packages = with pkgs; [
+      par
       ripgrep
     ];
 
@@ -156,6 +157,7 @@ in
           # Lua loader to search for our /nix/store/.../?.lua files.
           (lib.mkBefore ''
             package.path = '${config}/?.lua;' .. package.path
+            require('utils.fmt').set_fmt_map()
           '')
           # Extra Lua configuration to be appended to `init.lua`.
           (lib.mkAfter ''