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nixpkgs/NixOS manuals: devmode feature
Co-authored-by: Alejandro Sanchez Medina <alejandrosanchzmedina@gmail.com>
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@ -23,6 +23,14 @@ $ nix-shell
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If the build succeeds, the manual will be in `./result/share/doc/nixpkgs/manual.html`.
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## devmode {#sec-contributing-devmode}
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The shell in the manual source directory makes available a command, `devmode`.
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It is a daemon, that:
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1. watches the manual's source for changes and when they occur — rebuilds
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2. HTTP serves the manual, injecting a script that triggers reload on changes
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3. opens the manual in the default browser
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## Syntax {#sec-contributing-markup}
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As per [RFC 0072](https://github.com/NixOS/rfcs/pull/72), all new documentation content should be written in [CommonMark](https://commonmark.org/) Markdown dialect.
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20
doc/shell.nix
Normal file
20
doc/shell.nix
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@ -0,0 +1,20 @@
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let
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pkgs = import ../. {
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config = {};
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overlays = [];
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};
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common = import ./common.nix;
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inherit (common) outputPath indexPath;
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web-devmode = import ../pkgs/tools/nix/web-devmode.nix {
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inherit pkgs;
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buildArgs = "./.";
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open = "/${outputPath}/${indexPath}";
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};
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in
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pkgs.mkShell {
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packages = [
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web-devmode
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];
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}
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@ -11,6 +11,8 @@ $ nix-build nixos/release.nix -A manual.x86_64-linux
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If the build succeeds, the manual will be in `./result/share/doc/nixos/index.html`.
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There's also [a convenient development daemon](https://nixos.org/manual/nixpkgs/unstable/#sec-contributing-devmode).
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**Contributing to the man pages**
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The man pages are written in [DocBook] which is XML.
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20
nixos/doc/manual/shell.nix
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20
nixos/doc/manual/shell.nix
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@ -0,0 +1,20 @@
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let
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pkgs = import ../../.. {
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config = {};
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overlays = [];
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};
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common = import ./common.nix;
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inherit (common) outputPath indexPath;
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web-devmode = import ../../../pkgs/tools/nix/web-devmode.nix {
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inherit pkgs;
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buildArgs = "../../release.nix -A manualHTML.${builtins.currentSystem}";
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open = "/${outputPath}/${indexPath}";
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};
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in
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pkgs.mkShell {
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packages = [
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web-devmode
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];
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}
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117
pkgs/tools/nix/web-devmode.nix
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117
pkgs/tools/nix/web-devmode.nix
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@ -0,0 +1,117 @@
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{
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pkgs,
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# arguments to `nix-build`, e.g. `"foo.nix -A bar"`
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buildArgs,
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# what path to open a browser at
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open,
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}: let
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inherit (pkgs) lib;
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error_page = pkgs.writeShellScriptBin "error_page" ''
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echo "<!DOCTYPE html>
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<html>
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<head>
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<style>
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@media (prefers-color-scheme: dark) {
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:root { filter: invert(100%); }
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}
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</style>
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</head>
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<body><pre>$1</pre></body>
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</html>"
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'';
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# The following would have been simpler:
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# 1. serve from `$serve`
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# 2. pass each build a `--out-link $serve/result`
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# But that way live-server does not seem to detect changes and therefore no
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# auto-reloads occur.
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# Instead, we copy the contents of each build to the `$serve` directory.
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# Using rsync here, instead of `cp`, to get as close to an atomic
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# directory copy operation as possible. `--delay-updates` should
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# also go towards that.
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build_and_copy = pkgs.writeShellScriptBin "build_and_copy" ''
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set -euxo pipefail
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set +e
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stderr=$(2>&1 nix-build --out-link $out_link ${buildArgs})
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exit_status=$?
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set -e
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if [ $exit_status -eq 0 ];
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then
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# setting permissions to be able to clean up
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${lib.getBin pkgs.rsync}/bin/rsync \
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--recursive \
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--chmod=u=rwX \
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--delete-before \
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--delay-updates \
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$out_link/ \
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$serve/
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else
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set +x
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${lib.getBin error_page}/bin/error_page "$stderr" > $error_page_absolute
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set -x
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${lib.getBin pkgs.findutils}/bin/find $serve \
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-type f \
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! -name $error_page_relative \
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-delete
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fi
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'';
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# https://watchexec.github.io/
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watcher = pkgs.writeShellScriptBin "watcher" ''
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set -euxo pipefail
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${lib.getBin pkgs.watchexec}/bin/watchexec \
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--shell=none \
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--restart \
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--print-events \
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${lib.getBin build_and_copy}/bin/build_and_copy
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'';
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# A Rust alternative to live-server exists, but it was not in nixpkgs.
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# `--no-css-inject`: without this it seems that only CSS is auto-reloaded.
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# https://www.npmjs.com/package/live-server
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server = pkgs.writeShellScriptBin "server" ''
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set -euxo pipefail
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${lib.getBin pkgs.nodePackages_latest.live-server}/bin/live-server \
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--host=127.0.0.1 \
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--verbose \
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--no-css-inject \
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--entry-file=$error_page_relative \
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--open=${open} \
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$serve
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'';
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devmode =
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pkgs.writeShellScriptBin "devmode"
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''
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set -euxo pipefail
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function handle_exit {
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rm -rf "$tmpdir"
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}
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tmpdir=$(mktemp -d)
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trap handle_exit EXIT
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export out_link="$tmpdir/result"
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export serve="$tmpdir/serve"
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mkdir $serve
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export error_page_relative=error.html
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export error_page_absolute=$serve/$error_page_relative
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${lib.getBin error_page}/bin/error_page "building …" > $error_page_absolute
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${lib.getBin pkgs.parallel}/bin/parallel \
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--will-cite \
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--line-buffer \
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--tagstr '{/}' \
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::: \
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"${lib.getBin watcher}/bin/watcher" \
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"${lib.getBin server}/bin/server"
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'';
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in
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devmode
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