From e8e437fa62ee8652bf2f6d46d598b462c624332b Mon Sep 17 00:00:00 2001
From: atagen <boss@atagen.co>
Date: Wed, 21 May 2025 17:03:16 +1000
Subject: [PATCH] feat: init

.

.

.
---
 flake.lock  | 43 ++++++++++++++++++++++++++++++++++
 flake.nix   | 45 +++++++++++++++++++++++++++++++++++
 module.nix  | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 smooooth.sh | 44 +++++++++++++++++++++++++++++++++++
 4 files changed, 199 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 module.nix
 create mode 100755 smooooth.sh

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..aa97b79
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "nix-systems": {
+      "locked": {
+        "lastModified": 1689347949,
+        "narHash": "sha256-12tWmuL2zgBgZkdoB6qXZsgJEH9LR3oUgpaQq2RbI80=",
+        "owner": "nix-systems",
+        "repo": "default-linux",
+        "rev": "31732fcf5e8fea42e59c2488ad31a0e651500f68",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default-linux",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1747728033,
+        "narHash": "sha256-NnXFQu7g4LnvPIPfJmBuZF7LFy/fey2g2+LCzjQhTUk=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2f9173bde1d3fbf1ad26ff6d52f952f9e9da52ea",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nix-systems": "nix-systems",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..f76ea1c
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,45 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    nix-systems.url = "github:nix-systems/default-linux";
+  };
+
+  outputs =
+    inputs:
+    with inputs;
+    let
+      forAllSystems =
+        function:
+        nixpkgs.lib.genAttrs (import nix-systems) (system: function nixpkgs.legacyPackages.${system});
+    in
+    {
+      packages = forAllSystems (pkgs: {
+        default = pkgs.writeShellApplication {
+          name = "smooooth";
+          runtimeInputs = builtins.attrValues {
+            inherit (pkgs)
+              polkit
+              gnugrep
+              coreutils
+              libnotify
+              inotify-tools
+              nix
+              ;
+          };
+          text = builtins.readFile ./smooooth.sh;
+        };
+      });
+      nixosModules.smooooth =
+        {
+          config,
+          options,
+          pkgs,
+          lib,
+          ...
+        }:
+        {
+          imports = [ ./module.nix ];
+          services.smooooth.package = self.packages.${pkgs.system}.default;
+        };
+    };
+}
diff --git a/module.nix b/module.nix
new file mode 100644
index 0000000..0ba373e
--- /dev/null
+++ b/module.nix
@@ -0,0 +1,67 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+let
+  inherit (lib) types;
+  inherit (lib.options) mkEnableOption mkOption;
+  cfg = config.services.smooooth;
+in
+{
+  options.services.smooooth = {
+    enable = mkEnableOption "the smooooth nixos hot reloader";
+    blockers = mkOption {
+      description = "Names of processes that may block reloading when holding a flake (sub)path open.";
+      default = [
+        "nano"
+        "nvim"
+        "vim"
+        "vi"
+        "hx"
+      ];
+      example = ''
+        [ "hx" ]
+      '';
+      type = types.listOf types.str;
+    };
+    path = mkOption {
+      description = "Path to the root of your flake.";
+      type = types.str;
+    };
+    pollingRate = mkOption {
+      description = "How frequently to poll for blockers when waiting on a reload.";
+      default = 10;
+      type = types.int;
+    };
+    nixPackage = mkOption {
+      description = "Your preferred package providing a `nix` executable.";
+      default = pkgs.nix;
+      type = types.package;
+    };
+    package = mkOption {
+      description = "smooooth package";
+      type = types.package;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.user = {
+      services.smooooth = {
+        path = [
+          cfg.package
+          cfg.nixPackage
+        ];
+        serviceConfig = {
+          Type = "exec";
+          ExecStart =
+            let
+              blockers = builtins.concatStringsSep "|" cfg.blockers;
+            in
+            "${lib.getExe cfg.package} ${cfg.path} ${blockers} ${toString cfg.pollingRate}";
+        };
+      };
+    };
+  };
+}
diff --git a/smooooth.sh b/smooooth.sh
new file mode 100755
index 0000000..ffcc384
--- /dev/null
+++ b/smooooth.sh
@@ -0,0 +1,44 @@
+SACRED_SPACE="$1"
+BLOCKERS="$2"
+PERIOD="$3"
+
+scrapePids() {
+	for pid in /proc/*; do
+	  if [[ "$pid" =~ ^[0-9]*$ ]]; then
+	    if grep -E "$BLOCKERS" -q /proc/"$pid"/comm; then
+	      if [[ "$(readlink /proc/"$pid"/cwd)" == "$SACRED_SPACE"* ]]; then
+	      	echo "$pid with name $(cat /proc/"$pid"/comm) is blocking"
+          return 0
+        fi
+      fi
+  	fi
+	done
+	return 1
+}
+
+while true; do
+
+	inotifywait -r "$SACRED_SPACE"
+
+
+	notify-send "smooooth" "config change detected. waiting for blockers to resolve.."
+	while scrapePids; do
+	  echo "found blocker in $SACRED_SPACE, waiting.."
+	  sleep "$PERIOD"
+	done
+
+	echo "building system"
+	notify-send "smooooth" "rebuilding your nixos config - please stand by"
+	temp="$(mktemp -d)"
+	build="$temp/system"
+	nix build --out-link "$build" "$SACRED_SPACE"#nixosConfigurations."$HOSTNAME".config.system.build.toplevel
+
+	echo "built - attempting to activate system"
+	notify-send "smooooth" "activating your new config"
+	switch="$(readlink "$build")/bin/switch-to-configuration"
+	pkexec "$switch" switch
+
+	echo "cleaning up"
+	rm -r "$temp"
+
+done