Run scripts/build with changes

autoload/nix.vim

@@ -0,0 +1,27 @@
+if polyglot#init#is_disabled(expand('<sfile>:p'), 'nix', 'autoload/nix.vim')
+  finish
+endif
+
+function! nix#find_drv_position()
+  let line = search("description")
+  if line == 0
+    let line = search("name")
+  endif
+  if line == 0
+    echo "error: could not find derivation"
+    return
+  endif
+
+  return expand("%") . ":" . line
+endfunction
+
+function! nix#edit(attr)
+  let output = system("nix-instantiate --eval ./. -A " . a:attr . ".meta.position")
+  if match(output, "^error:") == -1
+    let position = split(split(output, '"')[0], ":")
+    execute "edit " . position[0]
+    execute position[1]
+    " Update default command to nix-build.
+    let b:dispatch = 'nix-build --no-out-link -A ' . a:attr
+  endif
+endfunction