add toml

flesh out toml

move function

restore translations for ini

source escaping rules

tests pass

flake.nix

@@ -21,6 +21,7 @@
     checks = nixpkgs.lib.genAttrs supportedArchitectures (system: {
       template = import ./tests/template.nix { inherit legacyPackages system nixpkgs; };
       json = import ./tests/json.nix { inherit legacyPackages system nixpkgs; };
+      toml = import ./tests/toml.nix { inherit legacyPackages system nixpkgs; };
     });
   };
 }

lib.nix

@@ -12,7 +12,7 @@ rec {
    file = file;
   };
 
-  # make a template with placeholders
+  # make a template with placeholders from a text
   templateText = { name, text, outPath, translations ? {} }:
     pkgs.runCommand name {
       textBeforeTemplate = text;
@@ -28,15 +28,41 @@ rec {
       chmod +x $out/bin/${name}
     '';
 
-  templateGenerator = translations: generator: { name, value, outPath }: templateText {
+  # make a template with placeholders from a file
+  templateFromFile = { name, templateFile, outPath, translations ? {} }:
+    pkgs.runCommand name {
+      inherit templateFile;
+      script = ''
+        #!/bin/sh
+        ${nix_templater}/bin/nix_templater ${builtins.placeholder "out"}/template ${builtins.placeholder "nix_template"} "${outPath}" '${lib.strings.toJSON translations}'
+      '';
+      passAsFile = [ "script" ];
+    } ''
+      mkdir -p $out/bin
+      cp $templateFile $out/template
+      cp $scriptPath $out/bin/${name}
+      chmod +x $out/bin/${name}
+    '';
+
+  translateFile = translations: generator: { name, value, outPath }: templateFromFile {
+    inherit name outPath translations;
+    templateFile = generator value;
+  };
+
+  translateText = translations: generator: { name, value, outPath }: templateText {
     inherit name outPath translations;
     text = generator value;
   };
 
-  templateJsonWith = options: templateGenerator escapeJson (lib.generators.toJSON options);
-  templateYamlWith = options: templateGenerator escapeJson (lib.generators.toYAML options); # just json
-  templateIniWith = options: templateGenerator escapeJson (lib.generators.toINI options);
-  templateJson = templateJsonWith { };
-  templateYaml = templateYamlWith { };
+  # escaping: https://www.json.org/json-en.html
+  templateJson = translateFile escapeJson (pkgs.writers.writeJSON "template.json");
+  # just json
+  templateYaml = translateFile escapeJson (pkgs.writers.writeYAML "template.yaml");
+  # escaping: technically also control characters (U+0000 to U+001F): https://toml.io/en/v0.3.0#string
+  templateToml = translateFile escapeJson (pkgs.writers.writeTOML "template.toml");
+
+  # escaping: https://git.kernel.org/pub/scm/git/git.git/tree/Documentation/config.txt?id=a54a84b333adbecf7bc4483c0e36ed5878cac17b#n47
+  templateIniWith = options: translateText escapeJson (lib.generators.toINI options);
+
   templateIni = templateIniWith { };
 }

tests/toml.nix

@@ -0,0 +1,41 @@
+# test injecting a secret into a toml template
+{ legacyPackages, system, nixpkgs }:
+let
+  hostPkgs = nixpkgs.legacyPackages.${system};
+  secret_file = hostPkgs.writeText "secret" "secret\\needing\"escaping";
+in (nixpkgs.lib.nixos.runTest {
+    inherit hostPkgs;
+    name = "nix_templates";
+
+    nodes.machine = {pkgs, ...}: {
+      config = {
+        systemd.services.testservice = {
+          wantedBy = [ "multi-user.target" ];
+          serviceConfig = {
+            Type = "oneshot";
+            ExecStartPre = "${legacyPackages.${system}.templateToml {
+              name = "test";
+              value = {
+                foo = "text";
+                bar = legacyPackages.${system}.fileContents secret_file;
+              };
+              outPath = "./test";
+            }}/bin/test";
+            ExecStart = pkgs.writeScript "test_file_got_templates" ''
+              #!/bin/sh
+              cat ./test | grep -q 'secret'
+            '';
+          };
+        };
+      };
+    };
+
+    testScript = ''
+      start_all()
+      print(machine.execute("uname -a"))
+      machine.wait_for_unit("multi-user.target")
+      print(machine.succeed("cat /test"))
+      print(machine.succeed("cat /test | grep -q secret"))
+      # print(machine.succeed("cat /test | ${hostPkgs.jq}/bin/jq"))
+    '';
+  })