1 files changed, 136 insertions, 0 deletions

diff --git a/manpage.nix b/manpage.nix
new file mode 100644
index 0000000..bea6b25
--- /dev/null
+++ b/manpage.nix
@@ -0,0 +1,136 @@
+{ outputAttrPath, optionsAttrPath, optionsInternal ? true, }:
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = getAttrFromPath (optionsAttrPath  ++ [ "manpage" ]) config;
+in
+{
+  options = setAttrByPath optionsAttrPath {
+    manpage = {
+      name = mkOption {
+        type = types.str;
+        description = ''
+          Name of the generated manpage.
+        '';
+        internal = optionsInternal;
+      };
+
+      shortDescription = mkOption {
+        type = types.str;
+        description = ''
+          A short description of the generated manpage.
+        '';
+        internal = optionsInternal;
+      };
+
+      description = mkOption {
+        type = with types; nullOr lines;
+        description = ''
+          A long description of the generated manpage.
+        '';
+        default = null;
+        internal = optionsInternal;
+      };
+
+      section = mkOption {
+        type = types.int;
+        default = 5;
+        description = ''
+          The section number for the generated manpage.
+
+          The table below shows the section numbers of the manual followed by the types of pages they contain.
+
+          1. Executable programs or shell commands
+          2. System calls (functions provided by the kernel)
+          3. Library calls (functions within program libraries)
+          4. Special files (usually found in /dev)
+          5. File formats and conventions, e.g. /etc/passwd
+          6. Games
+          7. Miscellaneous (including macro packages and conventions), e.g. man(7), groff(7)
+          8. System administration commands (usually only for root)
+          9. Kernel routines [Non standard]
+        '';
+        internal = optionsInternal;
+      };
+
+      file = mkOption {
+        type = types.str;
+        description = ''
+          The file containing the generated manpage.
+        '';
+        default = "${strings.sanitizeDerivationName cfg.name}.${toString cfg.section}";
+        defaultText = "\${lib.strings.sanitizeDerivationName cfg.name}.\${toString cfg.section}";
+        internal = optionsInternal;
+      };
+
+      title = mkOption {
+        type = types.str;
+        default = "${toUpper (strings.sanitizeDerivationName cfg.name)}(${toString cfg.section})";
+        defaultText = "\${toUpper cfg.name}(\${toString cfg.section})";
+        description = ''
+          Title of the generated manpage.
+        '';
+        internal = optionsInternal;
+      };
+
+      textBefore = mkOption {
+        type = types.lines;
+        description = ''
+          Some text to insert before the list of options.
+        '';
+        default = "";
+        internal = optionsInternal;
+      };
+
+      textAfter = mkOption {
+        type = types.lines;
+        description = ''
+          Some text to insert after the list of options.
+        '';
+        default = "";
+        internal = optionsInternal;
+      };
+
+    };
+  };
+
+  config = setAttrByPath outputAttrPath {
+    manpage = pkgs.runCommand cfg.file
+      {
+        src = pkgs.writeText "${cfg.file}.md" ''
+          % ${cfg.title}
+
+          # NAME
+
+          ${cfg.name} - ${cfg.shortDescription}
+
+
+          ${optionalString (cfg.description != null) ''
+            # DESCRIPTION
+
+            ${cfg.description}
+          ''}
+
+
+          ${cfg.textBefore}
+
+
+          # OPTIONS
+
+          You can use the following options:
+
+          ${readFile (getAttrFromPath (outputAttrPath ++ ["doc-options-md"]) config)}
+
+
+          ${cfg.textAfter}
+        '';
+
+        nativeBuildInputs = [ pkgs.pandoc ];
+      } ''
+      pandoc "$src" --from=markdown --to=man --standalone --output="$out"
+    '';
+  };
+}