feat: hide solutions; template: fix link to manual

packages/preview/lacy-ubc-math-project/0.1.0/format.typ

@@ -23,6 +23,14 @@
 // Make sure the numbering and labeling are consistent.
 #assert(__question-numbering.len() == __max-qs-level and __question-labels.len() == __max-qs-level)
 
+// solution visibility
+#let __solution-visible = state("solution-visible", true)
+#let toggle-solution(visible) = {
+  assert(type(visible) == bool, message: "The visibility of the solution must be a boolean.")
+  __solution-visible.update(v => visible)
+}
+#let __solution-disabled = sys.inputs.at("hide-solution", default: "") in ("1", "true", "yes", "y")
+
 /// Creates an author (a `dictionary`).
 /// - firstname (str, content): The author's first name, bold when displayed.
 /// - lastname (str, content): The author's last name.
@@ -125,12 +133,14 @@
 /// - body (content): The solution.
 /// - color (color): The color of the solution frame and text.
 /// - supplement (content): The supplemental text to be displayed before the solution.
-#let solution(body, color: green-solution, supplement: [*Solution*: ]) = {
-  block(
+#let solution(body, color: green-solution, supplement: [*Solution*: ], force: false) = {
+  context block(
     width: 100%,
     inset: 1em,
     stroke: color + 0.5pt,
   )[
+    #if __solution-disabled { return none }
+    #if not force and not __solution-visible.get() { return none }
     #set align(left)
     #set text(fill: color)
     #supplement#body

packages/preview/lacy-ubc-math-project/0.1.0/lib.typ

@@ -4,7 +4,7 @@
 #import prefixes: *
 #import "@preview/equate:0.2.1": *
 
-#import "format.typ": author, question, solution, green-solution
+#import "format.typ": author, question, solution, green-solution, toggle-solution
 #import "shorthand.typ": *
 #import "drawing.typ" as drawing
 
@@ -100,8 +100,12 @@
   #set page(numbering: none)
   #set par(first-line-indent: 0em)
   #set text(font: ("DejaVu Serif", "New Computer Modern"), size: 10pt)
-  #show ref: set text(fill: blue.darken(30%), stroke: 0.2pt + blue.darken(30%))
-  #show link: set text(fill: blue.darken(30%), stroke: 0.2pt + blue.darken(30%))
+  #let link_s = it => {
+    set text(fill: blue.darken(30%))
+    underline(it)
+  }
+  #show ref: link_s
+  #show link: link_s
 
   #set math.equation(numbering: "(1.1)")
 

packages/preview/lacy-ubc-math-project/0.1.0/manual.typ

@@ -527,6 +527,32 @@ Solution is usually put in a question block as a response to it.
 ]
 ```
 
+== Hiding Solutions
+There are 2 ways to hide solutions.
+
+To disable all solutions (all solutions will not show, no matter what), provide `hide-solution` to compile inputs:
+```bash
+typst compile filename.typ --input hide-solution=true
+```
+The value can be any of `true`, `1`, `yes`, `y`.
+
+This flag is also visible in the `unsafe` module as ```typc __solution-disabled```.
+
+To hide arbitrary solutions, use ```typc toggle-solution()``` before the solutions you wish to hide.
+In this case, individual solutions can be forced to show by setting ```typc force: true``` in the ```typc solution()``` function.
+#showcode(```typst
+#solution[Visible.]
+// toggle solutions off
+#toggle-solution(false)
+#solution[Hidden.]
+// force it to show
+#solution(force: true)[Forced to be visible.]
+// toggle them back on
+#toggle-solution(true)
+#solution[Visible again.]
+```)
+
+
 
 = Drawing
 As we are doing math, inevitably we will need to draw some graphs.

packages/preview/lacy-ubc-math-project/0.1.0/template/project1.typ

@@ -37,4 +37,5 @@
   ]
 ]
 
-There is also a #link("/lace-wing/lacy-ubc-math-project/blob/master/manual.pdf")[manual] for this project.
+There is also a #link("https://github.com/lace-wing/lacy-ubc-math-project")[manual] for this project.
+

packages/preview/lacy-ubc-math-project/0.1.0/unsafe.typ

@@ -1 +1 @@
-#import "format.typ": __question-level, __question-counters, __question-labels, __question-numbering, __max-qs-level, __question-duplicates
+#import "format.typ": __question-level, __question-counters, __question-labels, __question-numbering, __max-qs-level, __question-duplicates, __solution-visible, __solution-disabled