From 289028850f196aa89b411095ee883206f56227f1 Mon Sep 17 00:00:00 2001
From: Hiroki Noda <kubo39@gmail.com>
Date: Mon, 4 Jun 2018 01:42:09 +0900
Subject: [PATCH] Use `saturating_sub` instead of `checked_sub.unwrap_or`

---
 src/preprocess/links.rs | 2 +-
 src/utils/string.rs     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/preprocess/links.rs b/src/preprocess/links.rs
index fe0342b8..8b0c863a 100644
--- a/src/preprocess/links.rs
+++ b/src/preprocess/links.rs
@@ -122,7 +122,7 @@ fn parse_include_path(path: &str) -> LinkType<'static> {
     let start = parts
         .next()
         .and_then(|s| s.parse::<usize>().ok())
-        .map(|val| val.checked_sub(1).unwrap_or(0));
+        .map(|val| val.saturating_sub(1));
     let end = parts.next();
     let has_end = end.is_some();
     let end = end.and_then(|s| s.parse::<usize>().ok());
diff --git a/src/utils/string.rs b/src/utils/string.rs
index 22459093..9d9a614e 100644
--- a/src/utils/string.rs
+++ b/src/utils/string.rs
@@ -50,7 +50,7 @@ pub fn take_lines<R: RangeArgument<usize>>(s: &str, range: R) -> String {
     let start = *range.start().unwrap_or(&0);
     let mut lines = s.lines().skip(start);
     match range.end() {
-        Some(&end) => lines.take(end.checked_sub(start).unwrap_or(0)).join("\n"),
+        Some(&end) => lines.take(end.saturating_sub(start)).join("\n"),
         None => lines.join("\n"),
     }
 }