Use partial application for nicer show API

exam/demo.typ

@@ -1,13 +1,12 @@
-#import "@ysec/exam:0.1.0": exam, question, reponse
-#show: doc => exam(
+#import "@y-sec/exam:0.1.0": exam, question, reponse
+#show: exam(
   title: "Examen en Typst",
   subtitle: "Y-Security - Typst Essentials",
   course: "TES",
-  date: datetime(year: 2024, month: 5, day: 27),
+  date: datetime(year: 2050, month: 1, day: 1),
   author: "Maxime Augier",
   time: "45 minutes",
   allowed: "une page A4 (recto-verso) de résumé personnel",
-  doc
 )
 
 = Questions et Réponses

exam/lib.typ

@@ -6,14 +6,14 @@
 #let solution_mode = { sys.inputs.at("mode", default: "") == "solution" };
 
 #let points_counter(h) = {
-  // Find the first heading at a level equal or higher than this one
+  // Find the first heading at a level equal or lower (more important) than this one
   let headings_after = query(selector(heading)
-      .after(h.location())
+      .after(h.location(), inclusive: false)
     ).filter(nh => nh.level <= h.level);
   
   let start_value = pctr.at(h.location())
   let stop_value = if headings_after.len() == 0 { pctr.final() }
-     else { pctr.at(headings_after.last().location()) } 
+     else { pctr.at(headings_after.first().location()) }
   stop_value.at(0) - start_value.at(0)
 }
 
@@ -29,7 +29,7 @@
 
 #let exam(title: "Exam", course: none, date: none, class: none,
      year: none, author: none, subtitle: none, indications: none, 
-     time: none, allowed: none, doc) = {
+     time: none, allowed: none) = doc => {
 
   {
     set text(font: "Montserrat")