T59: a plain click on the line the shell reads moves its cursor there, which a user asked for after 0.1.6, as Ghostty's cursor-click-to-move: while OSC 133 says the shell reads a line, a click that stays in its cell, past the prompt the cursor's line shows, sends Left or Right arrows through the key encoder, one per character, soft wraps joined; never on the alternate screen, under mouse tracking or with a selection

src/term/click/tests.rs

@@ -0,0 +1,91 @@
+use alacritty_terminal::{
+    event::VoidListener,
+    term::{Config, test::TermSize},
+    vte::ansi::Processor,
+};
+
+use super::*;
+use crate::term::prompts::Prompts;
+
+const PROMPT: &str = "\x1b]133;A\x07$ \x1b]133;B\x07";
+
+/// A terminal `columns` wide after `text` passed the prompts' rewrite, as the tap passes it.
+fn term(columns: usize, text: &str) -> Term<VoidListener> {
+    let mut term = Term::new(Config::default(), &TermSize::new(columns, 4), VoidListener);
+    let mut parser: Processor = Processor::new();
+    parser.advance(&mut term, Prompts::default().pass(text.as_bytes()));
+    term
+}
+
+fn click(line: i32, column: usize) -> Point {
+    Point::new(Line(line), Column(column))
+}
+
+#[test]
+fn a_click_on_the_typed_line_counts_the_characters_to_it() {
+    let typed = term(20, &format!("{PROMPT}echo hello"));
+    assert_eq!(arrows(&typed, click(0, 7)), Some(-5), "back to hello");
+    assert_eq!(
+        arrows(&typed, click(0, 2)),
+        Some(-10),
+        "the first character"
+    );
+    assert_eq!(
+        arrows(&typed, click(0, 12)),
+        Some(0),
+        "the cursor's own cell"
+    );
+    let moved = term(20, &format!("{PROMPT}echo hello\x1b[5D"));
+    assert_eq!(arrows(&moved, click(0, 11)), Some(4), "on to the last o");
+    assert_eq!(
+        arrows(&moved, click(0, 18)),
+        Some(5),
+        "past the end, the end"
+    );
+}
+
+#[test]
+fn a_click_off_the_input_moves_nothing() {
+    let typed = term(20, &format!("{PROMPT}ls"));
+    assert_eq!(arrows(&typed, click(0, 0)), None, "on the prompt");
+    assert_eq!(arrows(&typed, click(0, 1)), None, "on the prompt's space");
+    assert_eq!(arrows(&typed, click(2, 3)), None, "another line");
+    let ran = term(20, &format!("{PROMPT}cat\r\nhello"));
+    assert_eq!(arrows(&ran, click(1, 2)), None, "a line no prompt shows");
+    let output = term(20, "$ plain text");
+    assert_eq!(arrows(&output, click(0, 3)), None, "no marks at all");
+    let full = term(20, &format!("{PROMPT}vim\x1b[?1049h"));
+    assert_eq!(arrows(&full, click(0, 3)), None, "the alternate screen");
+}
+
+#[test]
+fn a_wide_character_takes_one_arrow() {
+    let wide = term(20, &format!("{PROMPT}中文ab"));
+    assert_eq!(arrows(&wide, click(0, 3)), Some(-4), "the right half of 中");
+    assert_eq!(arrows(&wide, click(0, 4)), Some(-3), "文");
+    assert_eq!(arrows(&wide, click(0, 7)), Some(-1), "b");
+}
+
+#[test]
+fn soft_wrapped_rows_are_one_line() {
+    let wrapped = term(10, &format!("{PROMPT}abcdefghijkl"));
+    assert_eq!(wrapped.grid().cursor.point, click(1, 4));
+    assert_eq!(arrows(&wrapped, click(0, 3)), Some(-11), "back to b");
+    let back = term(10, &format!("{PROMPT}abcdefghijkl\x1b[3D"));
+    assert_eq!(arrows(&back, click(0, 3)), Some(-8), "up to b");
+    assert_eq!(arrows(&back, click(1, 3)), Some(2), "on to l");
+}
+
+#[test]
+fn trailing_spaces_count_only_up_to_the_cursor() {
+    let spaced = term(20, &format!("{PROMPT}ls  "));
+    assert_eq!(arrows(&spaced, click(0, 15)), Some(0));
+    assert_eq!(arrows(&spaced, click(0, 4)), Some(-2));
+}
+
+#[test]
+fn a_prompt_over_two_lines_keeps_its_input_on_the_last() {
+    let two = term(20, "\x1b]133;A\x07~/src\r\n> \x1b]133;B\x07make");
+    assert_eq!(arrows(&two, click(1, 2)), Some(-4));
+    assert_eq!(arrows(&two, click(0, 3)), None, "the prompt's first line");
+}