nte

nix template engine - takes some templates, entries and applies the templates to the entries nte's main repository is on [my forgejo](https://git.jacekpoz.pl/jacekpoz/nte) instance mirrors are available on [github](https://github.com/jacekpoz/nte) and [codeberg](https://codeberg.org/jacekpoz/nte), I accept contributions from anywhere # sites written in nte https://jacekpoz.pl if your site (or anything else) is written in nte, let me know and I'll add you to this list you can also use this button on your site and link to one of the repos [](https://git.jacekpoz.pl/jacekpoz/nte) # examples check `example/` for a static website written in nte build and run it using ```sh nix shell nixpkgs#darkhttpd --command sh -c "nix build -L .#examples.x86_64-linux.default && darkhttpd ./result" ``` the site will be available at http://localhost:8080 the example is a cut down version of my own website # usage first add nte as an input in your project's flake ```nix nte = { url = "git+https://git.jacekpoz.pl/jacekpoz/nte"; inputs.nixpkgs.follows = "nixpkgs"; }; ``` then the engine function will be available under ```nix inputs.nte.engines.${system}.default ``` it accepts 2 arguments: - `src` - the directory containing all entries and templates - an attrset of: - `extraArgs` - an attrset of additional arguments passed to all entries and templates - `entries` - a list of all entry files to be processed - `templates` - a list of all template files to be applied and returns a string containing a shell script that outputs the processed entries into files when passing the engine function to the main derivation, only provide it with the source directory: ```nix import ./project/default.nix { # ... nte = nte.engines.${system}.default ./project; }; ``` then you can pass the attrset and use it in that derivation, as in the example below: ```nix { nte, stdenv, ... }: let extraArgs = { foo = 2137; bar = "dupa"; baz = arg1: arg2: '' here's arg1: ${arg1} and here's arg2: ${arg2} ''; }; entries = [ ./entry1.nix ./foo/entry2.nix ./foo/entry3.nix ./bar/entry4.nix ./bar/entry5.nix ./bar/entry6.nix ]; templates = [ ./template1.nix ./template2.nix ]; in stdenv.mkDerivation { name = "nte-example"; version = "0.1"; src = ./.; buildPhase = '' runHook preBuild ${nte {inherit extraArgs entries templates;}} runHook postBuild ''; } ``` nte will handle creating directories if your source file structure isn't flat nte offers a standard library that contains `nixpkgs`, a `getEntry` function that handles an entry's `file` and utility functions found in [stdlib.nix](./stdlib.nix) ## templates a template can take an arbitrary number of arguments and returns `{ name, format, output }`: - `name` - used as a template ID for the entries - `format` - the extension of the output file (ignored if an entry defines `file`) - `output` - string if in a base template, entry to another template otherwise example template: ```nix { name, location, info, ... }: { name = "greeting"; format = "txt"; output = '' Hello ${name}! Welcome to ${location}. Here's some more information: ${info} ''; } ``` a template's output can also be an entry to another template: ```nix { name, location, date, time, ... }: { name = "greeting-with-date"; output = { template = "greeting"; inherit name location; info = '' You're visiting ${location} on ${date} at ${time}! ''; }; } ``` a template that's inherited from a different template also inherits its format - no need to define it again ## entries an entry can take an arbitrary number of arguments and returns `{ template, ... }`, the `...` being the desired template's arguments (sans `extraArgs`, those are passed either way) example entries (using the previous example templates): ```nix _: { template = "greeting"; name = "Jacek"; location = "Wrocław"; info = '' As of 2023, the official population of Wrocław is 674132 making it the third largest city in Poland. ''; } ``` an entry using the stdlib: ```nix { run, ... }: { template = "greeting-with-date"; name = "Rafał"; location = "Osieck"; date = run "date +%F"; time = run "date +%T"; } ``` if a binary isn't in `$PATH`, remember that each entry gets `pkgs`: ```nix { pkgs, run, ... }: let date = "${pkgs.coreutils-full}/bin/date"; in { # ... date = run "${date} +%F"; time = run "${date} +%T"; } ``` nte by default will follow your source file structure, if you want to specify the output location yourself use `file`: ```nix _: { # ... file = "foo/bar.txt"; } ``` in this example the output of this entry will end up at `$out/foo/bar.txt` instead of the default location - a base template's `format` will also be ignored # thanks [raf](https://notashelf.dev/) for helping me out with some of the nix and setting up mirrors # license MIT