chore: remove preview/ directory

swank-tex/lib.typ

@@ -0,0 +1,64 @@
+/// Provides typographically correct TeX-family logos for Typst. Based on the
+/// LaTeX metalogo package by Andrew Gilbert Moschou.
+///
+/// # Example
+/// ```typ
+/// #import "@preview/swank-tex:<version>": *
+/// The #TeX typesetting system, along with #LaTeX and #XeTeX.
+/// ```
+
+#let (TeX, LaTeX, LaTeX2E, XeTeX, XeLaTeX, LuaTeX, LuaLaTeX, pdfTeX) = {
+  // kerning values between pairs
+  let kern = (
+    "Te":   h(-0.165em), // Knuth says: -0.1667em
+    "eX":   h(-0.122em), // Knuth says: -0.125em
+    "La":   h(-0.361em),
+    "aT":   h(-0.147em),
+    "X2":   h( 0.150em),
+    "twoE": h( 0.133em),
+    "Xe":   h(-0.122em), // mirrors "eX"
+    "eT":   h(-0.165em), // mirrors "Te"
+    "eL":   h(-0.124em),
+    "LuaT": h( 0.005em), // questionable, but matches metalogo output
+    "LuaL": h( 0.005em), // questionable, but matches metalogo output
+  )
+
+  // vertical translation for certain characters
+  let drop = (
+    "E":  0.220em,
+    "A": -0.178em,
+    "e": -0.104em,
+  )
+
+  // resize certain characters
+  let sized = (
+    "A": text(size: 0.7em, "A"),
+    "e": text(size: 1.66em, sym.epsilon),
+  )
+
+  // helper functions
+  let ncm(content) =  text(font: "New Computer Modern", content)
+
+  // components (used in logos below)
+  let E    = box(move(dy: drop.E, "E"))
+  let A    = box(move(dy: drop.A, sized.A))
+  let e    = box(move(dy: drop.e, rotate(12deg, sized.e)))
+  let Erev = box(scale(x: -100%, E))
+  let Xe   = box[X#kern.Xe#Erev]
+
+  // logos which are also components
+  let TeX = ncm(box[T#kern.Te#E#kern.eX#[X]])
+  let LaTeX = ncm(box[L#kern.La#A#kern.aT#TeX])
+
+  // return logos
+  (
+    TeX,
+    LaTeX,
+    ncm(box[#LaTeX#kern.X2#[2]#sub[#kern.twoE#e]]), // LaTeX2E
+    ncm(box[#Xe#kern.eT#TeX]),                      // XeTeX
+    ncm(box[#Xe#kern.eL#LaTeX]),                    // XeLaTeX
+    ncm(box[Lua#kern.LuaT#TeX]),                    // LuaTeX
+    ncm(box[Lua#kern.LuaL#LaTeX]),                  // LuaLaTeX
+    ncm(box[pdf#TeX]),                              // pdfTeX
+  )
+}