From 8846e63a6f1fe51ee9a68dc511cc6fcdbf54efa6 Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Sat, 3 Oct 2020 16:32:29 -0400
Subject: Verify html link line at the top of markdown files when converting

---
 md.bqn           | 53 ++++++++++++++++++++++++++++++++++-------------------
 spec/inferred.md |  2 ++
 2 files changed, 36 insertions(+), 19 deletions(-)

diff --git a/md.bqn b/md.bqn
index a5fe9021..cae918ab 100644
--- a/md.bqn
+++ b/md.bqn
@@ -153,6 +153,24 @@ Base64 ← {
   (v⊏b64)∾(3|-l)⥊'='
 }
 
+# HTML and JS for demo REPL used in main README
+repl ← 1↓"
+<div class='cont'>
+  <div class='kb'></div>
+  <div class='rel'>
+    <textarea class='code' rows='1' autofocus><⟜'a'⊸/ ""Big Questions Notation""</textarea>
+    <svg class='demo' viewBox='0 -6 4 12'><path d='M1 -6H0L1 0L0 6H1L4 0z'/></svg>
+  </div>
+  <pre class='rslt'>""B Q N""</pre>
+</div>"
+loadRepl ← "<script src='bqn.js'></script><script src='repl.js'></script>"
+
+# Various URLs
+siteURL ← "https://mlochbaum.github.io/BQN/"
+tryURL  ← siteURL∾"try.html#code="
+repoURL ← "https://github.com/mlochbaum/BQN"
+blobURL ← repoURL∾"/blob/master/"
+
 
 ################################
 Markdown ← {filename𝕊𝕩:
@@ -213,8 +231,7 @@ Markdown ← {filename𝕊𝕩:
     } 𝕩
 
     Link ← {
-      try←"https://mlochbaum.github.io/BQN/try.html#code="
-      c ← try ∾ "&run" ∾˜ Base64 ¯1 ↓ JoinLines 4↓¨𝕩
+      c ← tryURL ∾ "&run" ∾˜ Base64 ¯1 ↓ JoinLines 4↓¨𝕩
       ("a class=""replLink"" title=""Open in the REPL"" target=""_blank"" href="∾""""(∾∾⊣)c) Html "↗️"
     }
     mod ← ⟨em,e∾c∾r,ei∾ci∾ri⟩ Modify code
@@ -294,17 +311,8 @@ Markdown ← {filename𝕊𝕩:
   # Lazy rule: if it starts with < and contains >, it's probably HTML
   IsHtmlBlock ← ⊑ ">"⊸∊
   useRepl ← 0
-  loadRepl ← "<script src='bqn.js'></script><script src='repl.js'></script>"
   ProcHtmlBlock ← ("<!--REPL-->"∾lf)⊸≢◶{𝕩⋄
-    useRepl ↩ 1
-"<div class='cont'>
-  <div class='kb'></div>
-  <div class='rel'>
-    <textarea class='code' rows='1' autofocus><⟜'a'⊸/ ""Big Questions Notation""</textarea>
-    <svg class='demo' viewBox='0 -6 4 12'><path d='M1 -6H0L1 0L0 6H1L4 0z'/></svg>
-  </div>
-  <pre class='rslt'>""B Q N""</pre>
-</div>"
+    useRepl ↩ 1 ⋄ repl
   }‿{
     codeMask ← "<code>" (6⥊0)⊸»⊸(>○(⌈`(1+↕∘≠)⊸×))○(⍷⟜𝕩 ∾ 0⥊˜1-˜≠) "</code>"
     (1¨ <⊸∾ codeMask⊸GetMultiHighlights)⊸Modify 𝕩
@@ -362,7 +370,7 @@ Markdown ← {filename𝕊𝕩:
     ProcLink ← {text 𝕊 target:
       ∾⟨"<a href=""",AdjustTarget ⥊target,""">",ProcInline text,"</a>"⟩
     }
-    ghPath ← "https://github.com/mlochbaum/BQN/blob/master/"∾path
+    ghPath ← blobURL∾path
     AdjustTarget ← {
       # Adjust relative *.md links, and make other relative links
       # absolute (pointing to github.com instead of github.io).
@@ -430,9 +438,6 @@ Markdown ← {filename𝕊𝕩:
   ######
   # Create the block structure using line classifications.
 
-  # First remove the html link line: the output *is* the html file.
-  𝕩 ↩ 2⊸↓⍟("*View this file" (⊣ ≡ ⌊○≠↑⊢) ⊑) 𝕩
-
   lengths ← ≠¨ 𝕩                   # Length of each line
   blanks ← (Lead ' '⊸=)¨ 𝕩         # Number of leading blanks
   nonEmptyMask ← blanks < lengths  # Empty ←→ all leading blanks
@@ -609,8 +614,18 @@ Fmt ← ⍕ _fmtm
 ################################
 # Creating HTML files
 ConvertFile ← {
+  MatchStart‿MatchEnd ← { ≤○≠◶0‿(⊣ ≡ (𝕩×≠)⊸↑) }¨ 1‿¯1
+
+  # Input file 𝕩 should be markdown; output file is fileout
+  ! ".md" MatchEnd 𝕩
+  fileout ← ".html" ∾˜ (¯6⊸↓∾"index"˙)⍟("README"⊸MatchEnd) ¯3↓𝕩
+
+  # Contents of file to convert
   md ← •LNS •path∾𝕩
-  out ← 𝕩 Markdown md
+  # Verify and remove the html link line: the output *is* the html file.
+  ! ("*View this file"⊸MatchStart ∧ (siteURL∾fileout∾").*")⊸MatchEnd) ⊑md
+  out ← 𝕩 Markdown 2↓md
+
   parts ← (1-˜·(¬×1++`)'/'⊸=)⊸⊔ (⊑⊐⟜".")⊸↑ 𝕩
   root ← ⊑ up ← ⥊∘/⟜≍⟜"../"¨ ⌽↕≠parts
   isInd ← "README" ≡ ¯1⊑parts
@@ -621,9 +636,9 @@ ConvertFile ← {
     "stylesheet" Link "style.css"
     "title" Html "BQN: " ∾⍟(¬·∨´"BQN"⍷⊢) 2↓⊑(2≤≠)◶0‿("# "≡2⊸↑)¨⊸/md
   ⟩
-  gh ← "a href='https://github.com/mlochbaum/BQN'"Html"BQN"
+  repo ← "a href='"‿repoURL‿"'" ∾⊸Html "BQN"
   crumbs ← up ("a href='"∾∾⟜"index.html'")⊸Html¨○((-isInd)⊸↓) (<"main")»parts
-  nav ← RQ "div class='nav'" Html 3↓∾ " / "⊸∾¨ gh <⊸∾ crumbs
+  nav ← RQ "div class='nav'" Html 3↓∾ " / "⊸∾¨ repo <⊸∾ crumbs
   front ← head ∾○(∾⟜lf) nav
   front ∾ out
 }
diff --git a/spec/inferred.md b/spec/inferred.md
index 43e6221e..f61d6fce 100644
--- a/spec/inferred.md
+++ b/spec/inferred.md
@@ -1,3 +1,5 @@
+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/spec/inferred.html).*
+
 # Specification: BQN inferred properties
 
 BQN includes some simple deductive capabilities: detecting the type of empty array elements, and the Undo (`⁼`) and Under (`⌾`) modifiers. These tasks are a kind of proof-based or constraint programming, and can never be solved completely (some instances will be undecidable) but can be solved in more instances by ever-more sophisticated algorithms. To allow implementers to develop more advanced implementations while offering some stability and portability to programmers, two kinds of specification are given here. First, constraints are given on the behavior of inferred properties. These are not exact and require some judgment on the part of the implementer. Second, behavior for common or useful cases is specified more precisely. Non-normative suggestions are also given as a reference for implementers.
-- 
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