From 4761303e6d6d189b7bfb4cd62fb31b124a69ebe4 Mon Sep 17 00:00:00 2001
From: Madeleine Sydney <lomiskiam@gmail.com>
Date: Sat, 11 Jan 2025 01:56:33 -0700
Subject: [PATCH] feat: Gen help for options

---
 scripts/sydnix/src/asciidoc/render.clj      | 15 +++++++++++++--
 scripts/sydnix/src/asciidoc/types.clj       | 12 +++++++++++-
 scripts/sydnix/src/sydnix/commands/help.clj | 16 ++++++++++++++--
 3 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/scripts/sydnix/src/asciidoc/render.clj b/scripts/sydnix/src/asciidoc/render.clj
index ff9a8ec..a2a3f56 100644
--- a/scripts/sydnix/src/asciidoc/render.clj
+++ b/scripts/sydnix/src/asciidoc/render.clj
@@ -38,11 +38,15 @@
 (defn- render-p [block]
   (apply println (:content block)))
 
+(defn- render-description [depth {{:keys [described]} :arguments :as block}]
+  (printf "%s::\n" described)
+  (run! #(render* (inc depth) %) (:content block)))
+
 (defn- render-section [depth {:keys [arguments] :as block}]
   (print (apply str (repeat (inc depth) \=))
          (:title arguments)
          "\n\n")
-  (run! render-p (:content block))
+  (run! #(render* (inc depth) %) (:content block))
   (println))
 
 (defn- render* [depth block]
@@ -52,6 +56,8 @@
                   (render-document-header depth block))
     :section (render-section depth block)
     :p (render-p block)
+    :description (render-description depth block)
+    :<> (run! #(render* (inc depth) %) (apply concat (:content block)))
     (throw (ex-info "no case" {:for (:context block)
                                :block block}))))
 
@@ -64,7 +70,10 @@
    [:section {:title "Name"}
     [:p "sydnix - Inspect and operate upon the system."]]
    [:section {:title "Synopsis"}
-    [:p "*sydnix* [_COMMAND_]... [_OPTION_]... [_FILE_]..."]]])
+    [:p "*sydnix* [_COMMAND_]... [_OPTION_]... [_FILE_]..."]]
+   [:section {:title "Options"}
+    [:description {:described "*--flake=URI*"}
+     "UJri is a flake"]]])
 
 (defn conform! [spec x]
   (let [x' (s/conform spec x)]
@@ -72,6 +81,8 @@
       (throw (ex-info "invalid" (s/explain-data spec x)))
       x')))
 
+;; Currently unrelentingly recursive.  We'll fix this if/when it bnecomes a
+;; problem.  Shame Clojure skimps out on general TCO. }:(
 (defn render
   "Render an AsciiDoc block to `*out*`."
   [block]
diff --git a/scripts/sydnix/src/asciidoc/types.clj b/scripts/sydnix/src/asciidoc/types.clj
index b61a365..a2f5834 100644
--- a/scripts/sydnix/src/asciidoc/types.clj
+++ b/scripts/sydnix/src/asciidoc/types.clj
@@ -16,7 +16,7 @@
       :or {required-args {}
            optional-args {}
            content-spec (s/* ::block)}}]
-  (s/and vector?
+  (s/and seqable?
          (s/cat :context (s/and keyword? #{name})
                 :arguments (make-block-arguments required-args optional-args)
                 :content content-spec)
@@ -35,13 +35,23 @@
   (make-block :name :p
               :content-spec (s/* string?)))
 
+(s/def ::description
+  (make-block :name :description
+              :required-opts {:described string?}))
+
 (s/def ::section
   (make-block :name :section
               :required-args {:title string?}))
 
+(s/def ::<>
+  (make-block :name :<>
+              :content (s/coll-of ::block)))
+
 (s/def ::block
   (s/and (s/or :document ::document
                :section ::section
+               :description ::description
+               :<> ::<>
                :p ::p)
          ;; `s/or` provides tagging that `make-block` already does.
          (s/conformer #(nth % 1))))
diff --git a/scripts/sydnix/src/sydnix/commands/help.clj b/scripts/sydnix/src/sydnix/commands/help.clj
index 6079c67..c529a3a 100644
--- a/scripts/sydnix/src/sydnix/commands/help.clj
+++ b/scripts/sydnix/src/sydnix/commands/help.clj
@@ -14,6 +14,11 @@
 (defn- find-dispatched [dispatch]
   (find-satisfying #(= dispatch (:cmds %)) *cli-table*))
 
+(defn- format-p [s]
+  (-> s
+      (str/replace #"^ +" " ")
+      (str/replace #"\n +" "\n")))
+
 (defn- docs-for-command [command-spec]
   (let [command (cons "sydnix" (:cmds command-spec))]
     [:document {:title (str (str/join "-" command)
@@ -29,13 +34,20 @@
      [:section {:title "Synopsis"}
       [:p (format "%s [_option_…]"
                   (str/join " " command))]]
-     [:section {:title "Options"}
-      [:p "synopsis"]]]))
+     (concat [:section {:title "Options"}]
+             (for [[opt opt-spec] (:spec command-spec)]
+               [:description {:described (format "*--%s%s*"
+                                                 (name opt)
+                                                 (if-let [ref (:ref opt-spec)]
+                                                   (str "=" ref)
+                                                   ""))}
+                [:p (format-p (:desc opt-spec))]]))]))
 
 (defn- render-docs-for-command [command-spec]
   (try (ar/render (docs-for-command command-spec))
        (catch Exception e
          (prn e)
+         (s/explain :asciidoc.types/document command-spec)
          (throw e))))