truncate long strings

3 files changed, 37 insertions, 22 deletions

diff --git a/Cargo.lock b/Cargo.lock
index a10ee2d..730c560 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,70 +4,75 @@
 name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "libc"
 version = "0.2.94"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18794a8ad5b29321f790b55d93dfba91e125cb1a9edbd4f8e3150acc771c1a5e"
 
 [[package]]
 name = "mail"
 version = "0.1.0"
 dependencies = [
- "notmuch 0.6.0",
- "termion 1.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "notmuch",
+ "termion",
+ "unicode-segmentation",
 ]
 
 [[package]]
 name = "notmuch"
 version = "0.6.0"
 dependencies = [
- "libc 0.2.94 (registry+https://github.com/rust-lang/crates.io-index)",
- "supercow 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc",
+ "supercow",
 ]
 
 [[package]]
 name = "numtoa"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
 
 [[package]]
 name = "redox_syscall"
 version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85dd92e586f7355c633911e11f77f3d12f04b1b1bd76a198bd34ae3af8341ef2"
 dependencies = [
- "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags",
 ]
 
 [[package]]
 name = "redox_termios"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8440d8acb4fd3d277125b4bd01a6f38aee8d814b3b5fc09b3f2b825d37d3fe8f"
 dependencies = [
- "redox_syscall 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall",
 ]
 
 [[package]]
 name = "supercow"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "171758edb47aa306a78dfa4ab9aeb5167405bd4e3dc2b64e88f6a84bbe98bd63"
 
 [[package]]
 name = "termion"
 version = "1.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "077185e2eac69c3f8379a4298e1e07cd36beb962290d4a51199acf0fdc10607e"
 dependencies = [
- "libc 0.2.94 (registry+https://github.com/rust-lang/crates.io-index)",
- "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_termios 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc",
+ "numtoa",
+ "redox_syscall",
+ "redox_termios",
 ]
 
-[metadata]
-"checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
-"checksum libc 0.2.94 (registry+https://github.com/rust-lang/crates.io-index)" = "18794a8ad5b29321f790b55d93dfba91e125cb1a9edbd4f8e3150acc771c1a5e"
-"checksum numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
-"checksum redox_syscall 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "85dd92e586f7355c633911e11f77f3d12f04b1b1bd76a198bd34ae3af8341ef2"
-"checksum redox_termios 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8440d8acb4fd3d277125b4bd01a6f38aee8d814b3b5fc09b3f2b825d37d3fe8f"
-"checksum supercow 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "171758edb47aa306a78dfa4ab9aeb5167405bd4e3dc2b64e88f6a84bbe98bd63"
-"checksum termion 1.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "077185e2eac69c3f8379a4298e1e07cd36beb962290d4a51199acf0fdc10607e"
+[[package]]
+name = "unicode-segmentation"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb0d2e7be6ae3a5fa87eed5fb451aff96f2573d2694942e40543ae0bbe19c796"
diff --git a/Cargo.toml b/Cargo.toml
index a06693e..05c475c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,9 +7,9 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-termion = "1"  # terminal control (cursor, style)
-
 notmuch = { path = "notmuch" }
+termion = "1"
+unicode-segmentation = "1"
 
 [profile.release]
 lto = "thin"
diff --git a/src/window.rs b/src/window.rs
index 3714c4c..a2f2b68 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -2,6 +2,7 @@
 
 use std::io::Write;
 use termion::{color, cursor};
+use unicode_segmentation::UnicodeSegmentation;
 
 #[derive(Clone, Copy)]
 pub struct Area {
@@ -16,6 +17,15 @@ pub enum Line {
     Highlight(String),
 }
 
+pub fn truncate_dots(s: &str, to: usize) -> String {
+    let graphemes = s.graphemes(true).collect::<Vec<_>>();
+    if graphemes.len() >= to {
+        format!("{}...", graphemes.iter().take(to - 3).fold(String::new(), |acc, s| format!("{}{}", acc, s)))
+    } else {
+        graphemes.join("")
+    }
+}
+
 pub struct Window {
     pub lines: Vec<Line>,
     scroll: usize,
@@ -37,12 +47,12 @@ impl Window {
                 Some(line) => {
                     write!(out, "{}", cursor::Goto(area.x, y))?;
                     match line {
-                        Line::Normal(s) => write!(out, "{}", s)?,
+                        Line::Normal(s) => write!(out, "{}", truncate_dots(s, area.w as usize))?,
                         Line::Highlight(s) => write!(
                             out,
                             "{}{}{}",
                             color::Fg(color::Red),
-                            s,
+                            truncate_dots(s, area.w as usize),
                             color::Fg(color::Reset),
                         )?,
                     }