Add blind text function

Cargo.lock

@@ -334,6 +334,15 @@ dependencies = [
  "safemem",
 ]
 
+[[package]]
+name = "lipsum"
+version = "0.8.0"
+source = "git+https://github.com/reknih/lipsum#c97ce95ba01ed2cce1d1b0b230b6b78295b0720b"
+dependencies = [
+ "rand",
+ "rand_chacha",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.6"
@@ -543,6 +552,12 @@ dependencies = [
  "miniz_oxide 0.5.1",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.36"
@@ -561,6 +576,31 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+
 [[package]]
 name = "rctree"
 version = "0.4.0"
@@ -854,6 +894,7 @@ dependencies = [
  "iai",
  "image",
  "kurbo",
+ "lipsum",
  "memmap2",
  "miniz_oxide 0.4.4",
  "once_cell",

Cargo.toml

@@ -17,6 +17,7 @@ typst-macros = { path = "./macros" }
 bytemuck = "1"
 either = "1"
 fxhash = "0.2"
+lipsum = { git = "https://github.com/reknih/lipsum", default-features = false }
 once_cell = "1"
 serde = { version = "1", features = ["derive"] }
 typed-arena = "2"

src/library/mod.rs

@@ -88,6 +88,7 @@ pub fn new() -> Scope {
     std.def_fn("letter", utility::letter);
     std.def_fn("roman", utility::roman);
     std.def_fn("symbol", utility::symbol);
+    std.def_fn("lipsum", utility::lipsum);
 
     // Predefined colors.
     std.def_const("black", Color::BLACK);

src/library/utility/blind.rs

@@ -0,0 +1,9 @@
+use lipsum::lipsum_from_seed;
+
+use crate::library::prelude::*;
+
+/// Create blind text.
+pub fn lipsum(_: &mut Context, args: &mut Args) -> TypResult<Value> {
+    let words: usize = args.expect("number of words")?;
+    Ok(Value::Str(lipsum_from_seed(words, 97).into()))
+}

src/library/utility/mod.rs

@@ -1,9 +1,11 @@
 //! Computational utility functions.
 
+mod blind;
 mod color;
 mod math;
 mod string;
 
+pub use blind::*;
 pub use color::*;
 pub use math::*;
 pub use string::*;

tests/typ/utility/blind.typ

@@ -0,0 +1,32 @@
+// Test blind text.
+
+---
+// Test basic call.
+#lipsum(19)
+
+---
+// Test custom paragraphs with user code.
+#set text(8pt)
+
+{
+  let sentences = lipsum(59)
+    .split(".")
+    .filter(s => s != "")
+    .map(s => s + ".")
+
+  let used = 0
+  for s in sentences {
+    if used < 2 {
+      used += 1
+    } else {
+      parbreak()
+      used = 0
+    }
+    s.trim()
+    [ ]
+  }
+}
+
+---
+// Error: 8-10 missing argument: number of words
+#lipsum()