nix-configs

commit 2e614caa3f9e4ee27c22b621dc73dc44311257ba
parent 9b255223f9fe1187d6cec88550afef6ec9af3570
Author: Peter <peter@minskio.co.uk>
Date:   Wed, 30 Sep 2026 22:15:59 +0100

New neovim script

Amends lastmod: in blog posts on save (if you want it to)

Diffstat:
M
home/neovim.nix
 | 
4
+++-
A
scripts/neovim-lastmod.nix
 | 
63
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 66 insertions(+), 1 deletion(-)
diff --git a/home/neovim.nix b/home/neovim.nix
@@ -2,6 +2,7 @@
 
 let
   sortblock = pkgs.callPackage ../scripts/neovim-sortblock.nix { };
+  lastmod = pkgs.callPackage ../scripts/neovim-lastmod.nix { };
 in
 {
   programs.neovim = {
@@ -9,7 +10,7 @@ in
     withPython3 = false;
     withRuby = false;
     defaultEditor = true;
-    plugins = with pkgs.vimPlugins; [ vim-nix sortblock ];
+    plugins = with pkgs.vimPlugins; [ vim-nix sortblock lastmod ];
     extraConfig = ''
       " Options
       set smartcase
@@ -46,6 +47,7 @@ in
     '';
     initLua = ''
       require("sortblock").setup()
+      require("lastmod")
 
       vim.api.nvim_create_user_command("Uppercase", function()
         vim.cmd("'<,'>s/.*/\\U&/")
diff --git a/scripts/neovim-lastmod.nix b/scripts/neovim-lastmod.nix
@@ -0,0 +1,63 @@
+{ lib, vimUtils, writeText, runCommand }:
+
+let
+  lastmodLua = writeText "lastmod.lua" ''
+    local SEARCH_LINES = 10
+    local TS_FORMAT = "%Y-%m-%dT%H:%M:%S"
+    local TS_PATTERN = "%d%d%d%d%-%d%d%-%d%dT%d%d:%d%d:?%d*"
+
+    local group = vim.api.nvim_create_augroup("LastmodPrompt", { clear = true })
+
+    vim.api.nvim_create_autocmd("BufWritePre", {
+    group = group,
+    pattern = { "*.md", "*.markdown" },
+    desc = "Prompt to update lastmod frontmatter field on save",
+    callback = function(args)
+    local buf = args.buf
+    if not vim.bo[buf].modifiable then
+      return
+    end
+
+    local lines = vim.api.nvim_buf_get_lines(buf, 0, SEARCH_LINES, false)
+
+    for i, line in ipairs(lines) do
+      local prefix, old = line:match("^(%s*lastmod:%s*[\"']?)(" .. TS_PATTERN .. ")")
+      if old then
+        local now = os.date(TS_FORMAT)
+        local choice = vim.fn.confirm(
+          ("Update lastmod?\n  %s  ->  %s"):format(old, now),
+          "&Yes\n&No",
+          1 -- defaults to Yes
+        )
+        if choice == 1 then
+          -- Replace only the timestamp, preserving indentation/quotes/trailing text
+          local new_line = line:gsub(TS_PATTERN, now, 1)
+          vim.api.nvim_buf_set_lines(buf, i - 1, i, false, { new_line })
+        end
+        return -- only handle the first lastmod field found
+      end
+    end
+    end,
+    })
+
+  '';
+in
+  vimUtils.buildVimPlugin {
+    pname = "lastmod";
+    version = "1.0.0";
+
+  # buildVimPlugin expects a source tree laid out the way Neovim's
+  # runtimepath wants it, so wrap the embedded lua string in lua/.
+  src = runCommand "lastmod-src" { } ''
+    mkdir -p $out/lua
+    cp ${lastmodLua} $out/lua/lastmod.lua
+  '';
+
+  nvimRequireCheck = "lastmod";
+
+  meta = {
+    description = "Prompts whether Neovim should update the lastmod field in markdown files on save";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.all;
+  };
+}