Add typst letter template

typst/letter/example.typ

@@ -0,0 +1,23 @@
+#import "letter.typ": template
+
+#show: template.with(
+  lang: "en",
+  name: "Joël von der Weid",
+  subject: "Cover letter for the Software Engineer (Backend) position",
+  date: "Sézegnin, 16 March 2025",
+  from-address: "Route de Sézegnin 63, CH-1285 Sézegnin",
+  to-details: [
+    Adaptyv Bio \
+    Biopole Life Science Campus \
+    Route de la Corniche 5 \
+    1066 Epalinges
+  ],
+)
+
+Dear Sir or Madam,
+
+#lorem(50)
+
+Sincerely,
+
+Joël von der Weid

typst/letter/letter.typ

@@ -0,0 +1,101 @@
+#let line-stroke = (paint: rgb("#731010"), thickness: 1pt, cap: "round")
+
+#let template(
+  lang: "fr",
+  background: rgb("fff"),
+  name: "Joël von der Weid",
+  from-address: "Rue de la Baumettaz 7, CH-1023 Crissier",
+  from-email: "jvonderweid@ikmail.com",
+  from-phone: "+41 79 861 88 08",
+  to-details: none,
+  subject: none,
+  date: none,
+  margin: (x: 2.5cm, y: 2cm),
+  vertical-center-level: 2,
+  doc
+) = {
+  set page(fill: background, margin: margin)
+  set text(font: ("Libertinus Serif"))
+
+  let subject = if subject != none {
+    let head = if lang == "en" { "Subject" } else { "Concerne " }
+
+    [
+      #text(weight: "bold", underline(head) + ": " + subject)
+      #v(0.5cm)
+    ]
+  } else {
+    none
+  }
+
+  let body = [
+    #set text(size: 11pt, weight: "medium")
+    #show par: set par(spacing: 1.75em, justify: true)
+    #subject
+    #doc
+  ]
+
+  let header = {
+    set text(font: "Nimbus Sans", style: "italic")
+    set par(leading: 0.9em)
+    grid(
+      inset: (x: 0cm, y: 3mm),
+      columns: (50%, 1fr),
+      grid.hline(start: 1, stroke: line-stroke),
+      [
+        #text(size: 25pt, weight: "bold", name) \
+        #text(size: 10pt, fill: rgb("444"), from-address)
+      ],
+      align(bottom + end, box(
+        inset: (top: 1em),
+        [
+          #set par(leading: 0.7em)
+          #set text(size: 10pt, fill: rgb("444"))
+          #from-phone \
+          #from-email
+        ]
+      )),
+      grid.hline(end: 1, stroke: line-stroke),
+    )
+    v(2cm)
+    set par(leading: 0.6em)
+    set text(style: "normal")
+    [
+      #h(10cm)
+      #box(width: 100% - 10cm, [
+        #text(size: 10pt, to-details)
+        #v(1.5cm)
+        #if date != none {
+          date
+        }
+      ])
+    ]
+    v(1cm)
+  }
+  
+  layout(size => context [
+    #let header-sz = measure(block(width: size.width, header))
+    #let body-sz = measure(block(width: size.width, body))
+
+    #let ratio = (header-sz.height + body-sz.height) / size.height
+    #let overflowing = ratio > 1
+
+    #if overflowing or vertical-center-level == none {
+      header
+      subject
+      body
+    } else {
+      // If no overflow of the first page, we do a bit of centering magic for style
+      
+      grid(
+        rows: (auto, 1fr),
+        header,
+        box([
+          #v(1fr * ratio)
+            #body
+          #v(vertical-center-level * 1fr)
+        ]),
+      )
+    }
+  ])
+}