Handle SIGPIPE

Based on the sample code in
https://stackoverflow.com/a/65760807/509706

Closes #28

CHANGELOG.md

@@ -22,6 +22,9 @@ Fixed crashes on files with non-ASCII characters on long lines.
 
 Removed the unused `--lang` argument.
 
+Difftastic now handles writing to a closed pipe (SIGPIPE) gracefully
+rather than crashing.
+
 ## 0.7
 
 ### Git integration

Cargo.lock

@@ -102,6 +102,7 @@ dependencies = [
  "diff",
  "itertools",
  "lazy_static",
+ "libc",
  "pretty_assertions",
  "regex",
  "rustc-hash",
@@ -143,9 +144,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.98"
+version = "0.2.99"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "320cfe77175da3a483efed4bc0adc1968ca050b098ce4f2f1c13a56626128790"
+checksum = "a7f823d141fe0a24df1e23b4af4e3c7ba9e5966ec514ea068c93024aa7deb765"
 
 [[package]]
 name = "memchr"

Cargo.toml

@@ -29,6 +29,7 @@ strsim = "0.10.0"
 lazy_static = "1.4.0"
 atty = "0.2.14"
 tree-sitter = "0.19.5"
+libc = "0.2.99"
 
 [dev-dependencies]
 pretty_assertions = "0.6.1"

src/main.rs

@@ -133,7 +133,21 @@ fn parse_args() -> Mode {
     }
 }
 
+/// Terminate the process if we get SIGPIPE.
+#[cfg(unix)]
+fn reset_sigpipe() {
+    unsafe {
+        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
+    }
+}
+
+#[cfg(not(unix))]
+fn reset_sigpipe() {
+    // Do nothing.
+}
+
 fn main() {
+    reset_sigpipe();
     configure_color();
     let arena = Arena::new();