--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tutorial.sml	Fri Jul 15 16:50:55 2011 -0400
@@ -0,0 +1,202 @@
+(* Copyright (c) 2011, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+structure Tutorial :> TUTORIAL = struct
+
+fun readAll' inf =
+    let
+        fun loop acc =
+            case TextIO.inputLine inf of
+                NONE => Substring.full (String.concat (rev acc))
+              | SOME line => loop (line :: acc)
+    in
+        loop []
+        before TextIO.closeIn inf
+    end
+
+fun readAll fname = readAll' (TextIO.openIn fname)
+
+fun doUr fname =
+    let
+        val eval = TextIO.openOut "/tmp/eval.ur"
+        val gen = TextIO.openOut "/tmp/gen.ur"
+
+        fun untilEnd source =
+            let
+                val (befor, after) = Substring.position "(* end *)" source
+            in
+                if Substring.isEmpty after then
+                    (source, Substring.full "")
+                else
+                    (befor, Substring.slice (after, 9, NONE))
+            end
+
+        fun doDirectives (count, source) =
+            let
+                val safe = String.translate (fn #"<" => "&lt;"
+                                              | #"&" => "&amp;"
+                                              | #"{" => "&#123;"
+                                              | #"(" => "&#40;"
+                                              | #"\n" => "&#40;*NL*)\n"
+                                              | ch => str ch) o Substring.string
+
+                val (befor, after) = Substring.position "(* begin " source
+
+                fun default () = (TextIO.outputSubstr (eval, source);
+                                  TextIO.output (gen, safe source))
+            in
+                if Substring.isEmpty after then
+                    default ()
+                else
+                    let
+                        val (command, after) = Substring.splitl (not o Char.isSpace) (Substring.slice (after, 9, NONE))
+                    in
+                        if Substring.isEmpty after then
+                            default ()
+                        else
+                            let
+                                val (_, rest) = Substring.position "*)" after
+                            in
+                                if Substring.isEmpty rest then
+                                    default ()
+                                else
+                                    let
+                                        val (arg, source) = untilEnd (Substring.slice (rest, 3, NONE))
+                                        val () = (TextIO.outputSubstr (eval, befor);
+                                                  TextIO.output (gen, safe befor))
+                                        val (count, skip) =
+                                            case Substring.string command of
+                                                "hide" => (TextIO.outputSubstr (eval, arg);
+                                                           (count, true))
+                                              | "eval" => (TextIO.output (eval, "val _eval");
+                                                           TextIO.output (eval, Int.toString count);
+                                                           TextIO.output (eval, " = ");
+                                                           TextIO.outputSubstr (eval, arg);
+                                                           TextIO.output (eval, "\n\n");
+
+                                                           TextIO.output (gen, safe arg);
+                                                           TextIO.output (gen, "== {[_eval");
+                                                           TextIO.output (gen, Int.toString count);
+                                                           TextIO.output (gen, "]}");
+
+                                                           (count + 1, false))
+                                              | s => raise Fail ("Unknown tutorial directive: " ^ s)
+                                    in
+                                        doDirectives (count, if skip then
+                                                                 #2 (Substring.splitl Char.isSpace source)
+                                                             else
+                                                                 source)
+                                    end
+                            end
+                    end
+            end
+    in
+        doDirectives (0, readAll fname);
+        TextIO.closeOut gen;
+
+        TextIO.output (eval, "\n\nfun main () : transaction page =\nreturn <xml><body>");
+        TextIO.outputSubstr (eval, readAll "/tmp/gen.ur");
+        TextIO.output (eval, "</body></xml>");
+        TextIO.closeOut eval;
+
+        if Compiler.compile "/tmp/eval" then
+            let
+                val proc = Unix.execute ("/bin/sh", ["-c", "/tmp/eval.exe /main"])
+                val inf = Unix.textInstreamOf proc
+                val s = readAll' inf
+                val _ = Unix.reap proc
+
+                val (befor, after) = Substring.position "<sc>" s
+            in
+                if Substring.isEmpty after then
+                    print ("Bad output for " ^ fname ^ "! [1]\n")
+                else
+                    let
+                        val after = Substring.slice (after, 4, NONE)
+                        val (befor, after) = Substring.position "</body>" after
+                    in
+                        if Substring.isEmpty after then
+                            print ("Bad output for " ^ fname ^ "! [2]\n")
+                        else
+                            let
+                                val outf = TextIO.openOut "/tmp/final.ur"
+
+                                fun eatNls source =
+                                    let
+                                        val (befor, after) = Substring.position "(*NL*)" source
+                                    in
+                                        if Substring.isEmpty after then
+                                            TextIO.outputSubstr (outf, source)
+                                        else
+                                            (TextIO.outputSubstr (outf, befor);
+                                             eatNls (Substring.slice (after, 6, NONE)))
+                                    end
+
+                                val cmd = "emacs --eval \"(progn "
+                                          ^ "(global-font-lock-mode t) "
+                                          ^ "(add-to-list 'load-path \\\""
+                                          ^ Config.sitelisp
+                                          ^ "/\\\") "
+                                          ^ "(load \\\"urweb-mode-startup\\\") "
+                                          ^ "(urweb-mode) "
+                                          ^ "(find-file \\\"/tmp/final.ur\\\") "
+                                          ^ "(switch-to-buffer (htmlize-buffer)) "
+                                          ^ "(write-file \\\""
+                                          ^ OS.Path.mkAbsolute {relativeTo = OS.FileSys.getDir (),
+                                                                path = OS.Path.joinBaseExt {base = OS.Path.base fname, ext = SOME "html"}}
+                                          ^ "\\\") "
+                                          ^ "(kill-emacs))\""
+                            in
+                                eatNls befor;
+                                TextIO.closeOut outf;
+                                ignore (OS.Process.system cmd)
+                            end
+                    end
+            end
+        else
+            ()
+    end
+
+fun make dirname =
+    let
+        val dir = OS.FileSys.openDir dirname
+
+        fun doDir () =
+            case OS.FileSys.readDir dir of
+                NONE => OS.FileSys.closeDir dir
+              | SOME fname =>
+                (if OS.Path.ext fname = SOME "ur" then
+                     doUr (OS.Path.joinDirFile {dir = dirname, file = fname})
+                 else
+                     ();
+                 doDir ())
+    in
+        Settings.setProtocol "static";
+        doDir ()
+    end
+
+end