make crossterm optional

.github/workflows/ci.yml

@@ -4,6 +4,8 @@ on: [push, pull_request]
 jobs:
   lint:
     runs-on: ubuntu-latest
+    env:
+      CARGO_TERM_COLOR: always
     steps:
       - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
@@ -14,6 +16,8 @@ jobs:
           override: true
       - uses: Swatinem/rust-cache@v1
       - name: rustfmt
-        run: cargo fmt -- --check --color always
+        run: cargo fmt -- --check
       - name: clippy
-        run: cargo clippy --color always -- -D warnings
+        run: cargo clippy -- -D warnings
+      - name: clippy with --no-default-features
+        run: cargo clippy --no-default-features -- -D warnings

Cargo.toml

@@ -3,6 +3,13 @@ name = "tui-textarea"
 version = "0.0.0"
 edition = "2021"
 
+[features]
+default = ["crossterm"]
+
 [dependencies]
-crossterm = "0.23.2"
+crossterm = { version = "0.23", optional = true }
 tui = "0.18"
+
+[[example]]
+name = "minimal"
+required-features = ["crossterm"]

src/input.rs

@@ -1,3 +1,4 @@
+#[cfg(feature = "crossterm")]
 use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
 
 #[derive(Clone, Copy, Debug)]
@@ -33,6 +34,7 @@ impl Default for Input {
     }
 }
 
+#[cfg(feature = "crossterm")]
 impl From<Event> for Input {
     fn from(event: Event) -> Self {
         if let Event::Key(key) = event {
@@ -43,6 +45,7 @@ impl From<Event> for Input {
     }
 }
 
+#[cfg(feature = "crossterm")]
 impl From<KeyEvent> for Input {
     fn from(key: KeyEvent) -> Self {
         let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);

src/textarea.rs

@@ -312,7 +312,7 @@ impl<'a> TextArea<'a> {
                 .char_indices()
                 .nth(chars)
                 .map(|(i, _)| i)
-                .unwrap_or(line[i..].len());
+                .unwrap_or_else(|| line[i..].len());
             let removed = line[i..i + bytes].to_string();
             line.replace_range(i..i + bytes, "");
             line.push(' ');