From c723667d402b730edc4059cb132587977893b42a Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adam@chlipala.net>
Date: Fri, 22 Jul 2011 15:39:38 -0400
Subject: Backpedal on tutorial-motivated urweb-mode changes; add
 Basis.diffInSeconds and Basis.toSeconds

---
 include/urweb.h         |  2 ++
 lib/js/urweb.js         |  8 ++++++++
 lib/ur/basis.urs        |  3 +++
 src/c/urweb.c           |  8 ++++++++
 src/elisp/urweb-mode.el | 10 +++++-----
 src/settings.sml        |  4 +++-
 6 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/include/urweb.h b/include/urweb.h
index 1b10583f..b5692a6d 100644
--- a/include/urweb.h
+++ b/include/urweb.h
@@ -252,6 +252,8 @@ __attribute__((noreturn)) void uw_redirect(uw_context, uw_Basis_string url);
 
 uw_Basis_time uw_Basis_now(uw_context);
 uw_Basis_time uw_Basis_addSeconds(uw_context, uw_Basis_time, uw_Basis_int);
+uw_Basis_int uw_Basis_diffInSeconds(uw_context, uw_Basis_time, uw_Basis_time);
+uw_Basis_int uw_Basis_toSeconds(uw_context, uw_Basis_time);
 extern const uw_Basis_time uw_Basis_minTime;
 
 void uw_register_transactional(uw_context, void *data, uw_callback commit, uw_callback rollback, uw_callback_with_retry free);
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 76ad76fa..9834fde6 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -105,6 +105,14 @@ function now() {
     return (new Date()).getTime() * 1000;
 }
 
+function diffInSeconds(tm1, tm2) {
+    return Math.round((tm2 - tm1) / 1000000);
+}
+
+function toSeconds(tm) {
+    return Math.round(tm / 1000000);
+}
+
 
 // Error handling
 
diff --git a/lib/ur/basis.urs b/lib/ur/basis.urs
index b60610cd..cabac068 100644
--- a/lib/ur/basis.urs
+++ b/lib/ur/basis.urs
@@ -145,6 +145,9 @@ val current : t ::: Type -> signal t -> transaction t
 val now : transaction time
 val minTime : time
 val addSeconds : time -> int -> time
+val toSeconds : time -> int
+val diffInSeconds : time -> time -> int
+(* Earlier time first *)
 val timef : string -> time -> string (* Uses strftime() format string *)
 val readUtc : string -> option time
 
diff --git a/src/c/urweb.c b/src/c/urweb.c
index 4d2de1dd..641c6c83 100644
--- a/src/c/urweb.c
+++ b/src/c/urweb.c
@@ -3664,6 +3664,14 @@ uw_Basis_time uw_Basis_addSeconds(uw_context ctx, uw_Basis_time tm, uw_Basis_int
   return tm;
 }
 
+uw_Basis_int uw_Basis_diffInSeconds(uw_context ctx, uw_Basis_time tm1, uw_Basis_time tm2) {
+  return difftime(tm2.seconds, tm1.seconds);
+}
+
+uw_Basis_int uw_Basis_toSeconds(uw_context ctx, uw_Basis_time tm) {
+  return tm.seconds;
+}
+
 void *uw_get_global(uw_context ctx, char *name) {
   int i;
 
diff --git a/src/elisp/urweb-mode.el b/src/elisp/urweb-mode.el
index 9138dafb..c9fe5f19 100644
--- a/src/elisp/urweb-mode.el
+++ b/src/elisp/urweb-mode.el
@@ -170,10 +170,8 @@ See doc for the variable `urweb-mode-info'."
           (finished nil)
           (answer nil)
           )
-      (while (and (not finished) (re-search-backward "[<>{}]|\\*\)" nil t))
+      (while (and (not finished) (re-search-backward "[<>{}]" nil t))
         (cond
-         ((looking-at "*)")
-          (search-backward "(*"))
          ((looking-at "{")
           (if (> depth 0)
               (decf depth)
@@ -183,11 +181,13 @@ See doc for the variable `urweb-mode-info'."
          ((save-excursion (backward-char 1) (or (looking-at "=>")
                                                 (looking-at "->")
                                                 (looking-at "<>")))
-          (setq finished t))
+          nil)
          ((or (looking-at "< ") (looking-at "<="))
-          (setq finished t))
+          nil)
          ((looking-at "<")
           (setq finished t))
+         ((save-excursion (backward-char 1) (looking-at " >"))
+          nil)
          ((looking-at ">")
           (cond
            ((> depth 0)
diff --git a/src/settings.sml b/src/settings.sml
index 57ab956a..c9030eac 100644
--- a/src/settings.sml
+++ b/src/settings.sml
@@ -252,7 +252,9 @@ val jsFuncsBase = basisM [("alert", "alert"),
 
                           ("now", "now"),
                           ("timeToString", "showTime"),
-                          ("htmlifyTime", "showTime")]
+                          ("htmlifyTime", "showTime"),
+                          ("toSeconds", "toSeconds"),
+                          ("diffInSeconds", "diffInSeconds")]
 val jsFuncs = ref jsFuncsBase
 fun setJsFuncs ls = jsFuncs := foldl (fn ((k, v), m) => M.insert (m, k, v)) jsFuncsBase ls
 fun jsFunc x = M.find (!jsFuncs, x)
-- 
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