home: create 'modules/home' folder

Consolidating all modules under the same path, to clear out the
top-level directory.

modules/home/direnv/default.nix

@@ -0,0 +1,46 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.direnv;
+in
+{
+  options.my.home.direnv = with lib; {
+    enable = my.mkDisableOption "direnv configuration";
+
+    defaultFlake = mkOption {
+      type = types.str;
+      default = "pkgs";
+      example = "nixpkgs";
+      description = ''
+        Which flake from the registry should be used for
+        <command>use pkgs</command> by default.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.direnv = {
+      enable = true;
+      nix-direnv = {
+        # A better `use_nix`
+        enable = true;
+      };
+    };
+
+    xdg.configFile =
+      let
+        libDir = ./lib;
+        contents = builtins.readDir libDir;
+        names = lib.attrNames contents;
+        files = lib.filter (name: contents.${name} == "regular") names;
+        linkLibFile = name:
+          lib.nameValuePair
+            "direnv/lib/${name}"
+            { source = libDir + "/${name}"; };
+      in
+      lib.my.genAttrs' files linkLibFile;
+
+    home.sessionVariables = {
+      DIRENV_DEFAULT_FLAKE = cfg.defaultFlake;
+    };
+  };
+}

modules/home/direnv/lib/nix.sh

@@ -0,0 +1,69 @@
+#shellcheck shell=bash
+
+use_pkgs() {
+    if ! has nix; then
+        # shellcheck disable=2016
+        log_error 'use_pkgs: `nix` is not in PATH'
+        return 1
+    fi
+
+    # Use user-provided default value, or fallback to nixpkgs
+    local DEFAULT_FLAKE="${DIRENV_DEFAULT_FLAKE:-nixpkgs}"
+    # Additional args that should be forwarded to `nix`
+    local args=()
+
+    # Allow changing the default flake through a command line switch
+    while true; do
+        case "$1" in
+            -b|--broken)
+                args+=(--impure)
+                export NIXPKGS_ALLOW_BROKEN=1
+                shift
+                ;;
+            -f|--flake)
+                DEFAULT_FLAKE="$2"
+                shift 2
+                ;;
+            -i|--impure)
+                args+=(--impure)
+                shift
+                ;;
+            -s|--insecure)
+                args+=(--impure)
+                export NIXPKGS_ALLOW_INSECURE=1
+                shift
+                ;;
+            -u|--unfree)
+                args+=(--impure)
+                export NIXPKGS_ALLOW_UNFREE=1
+                shift
+                ;;
+            --)
+                shift
+                break
+                ;;
+            *)
+                break
+                ;;
+        esac
+    done
+
+
+    # Allow specifying a full installable, or just a package name and use the default flake
+    local packages=()
+    for pkg; do
+        if [[ $pkg =~ .*#.* ]]; then
+            packages+=("$pkg")
+        else
+            packages+=("$DEFAULT_FLAKE#$pkg")
+        fi
+    done
+
+    # shellcheck disable=2154
+    direnv_load nix shell "${args[@]}" "${packages[@]}" --command "$direnv" dump
+
+    # Clean-up after ourselves (assumes the user does not set them before us)
+    unset NIXPKGS_ALLOW_BROKEN
+    unset NIXPKGS_ALLOW_INSECURE
+    unset NIXPKGS_ALLOW_UNFREE
+}

modules/home/direnv/lib/postgres.sh

@@ -0,0 +1,22 @@
+#shellcheck shell=bash
+
+layout_postgres() {
+    if ! has postgres || ! has initdb; then
+        # shellcheck disable=2016
+        log_error 'layout_postgres: `postgres` and `initdb` are not in PATH'
+        return 1
+    fi
+
+    # shellcheck disable=2155
+    export PGDATA="$(direnv_layout_dir)/postgres"
+    export PGHOST="$PGDATA"
+
+    if [[ ! -d "$PGDATA" ]]; then
+        initdb
+        cat >> "$PGDATA/postgresql.conf" << EOF
+listen_addresses = ''
+unix_socket_directories = '$PGHOST'
+EOF
+        echo "CREATE DATABASE $USER;" | postgres --single -E postgres
+    fi
+}

modules/home/direnv/lib/python.sh

@@ -0,0 +1,25 @@
+#shellcheck shell=bash
+
+layout_poetry() {
+    if ! has poetry; then
+        # shellcheck disable=2016
+        log_error 'layout_poetry: `poetry` is not in PATH'
+        return 1
+    fi
+
+    if [[ ! -f pyproject.toml ]]; then
+        # shellcheck disable=2016
+        log_error 'layout_poetry: no pyproject.toml found. Use `poetry new` or `poetry init` to create one first'
+        return 1
+    fi
+
+    # create venv if it doesn't exist
+    poetry run true
+
+    # shellcheck disable=2155
+    export VIRTUAL_ENV=$(poetry env info --path)
+    export POETRY_ACTIVE=1
+    PATH_add "$VIRTUAL_ENV/bin"
+    watch_file pyproject.toml
+    watch_file poetry.lock
+}