Update to Rust 1.48 (#424)

* Update to Rust 1.48.0

* Fix clippy::single_char_push_str warnings

* Fix clippy::manual_strip warnings

.github/workflows/build.yaml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.47.0
+          toolchain: 1.48.0
           components: clippy, rustfmt
           default: true
       - name: Install dependencies

README.md

@@ -65,7 +65,7 @@ from [GitHub Actions](https://actions-badge.atrox.dev/iceiix/stevenarella/goto?r
 
 ## Dependencies
 
-Requires Rust stable version 1.47.0 or newer.
+Requires Rust stable version 1.48.0 or newer.
 
 **Debian/Ubuntu**
 

src/render/glsl.rs

@@ -44,7 +44,7 @@ impl Registry {
         out.push_str("#version 150\n");
         out.push_str("#define ");
         out.push_str(define);
-        out.push_str("\n");
+        out.push('\n');
         self.get_internal(&mut out, name);
         out
     }
@@ -52,13 +52,13 @@ impl Registry {
     fn get_internal(&self, out: &mut String, name: &str) {
         let src = self.shaders.get(name).unwrap();
         for line in src.lines() {
-            if line.starts_with("#include ") {
-                let inc = line["#include ".len()..].trim();
+            if let Some(stripped) = line.strip_prefix("#include ") {
+                let inc = stripped.trim();
                 self.get_internal(out, inc);
                 continue;
             }
             out.push_str(line);
-            out.push_str("\n");
+            out.push('\n');
         }
     }
 }

src/render/mod.rs

@@ -1143,8 +1143,7 @@ impl TextureManager {
         self.add_defaults();
 
         for name in map.keys() {
-            if name.starts_with("steven-dynamic:") {
-                let n = &name["steven-dynamic:".len()..];
+            if let Some(n) = name.strip_prefix("steven-dynamic:") {
                 let (width, height, data) = {
                     let dynamic_texture = match self.dynamic_textures.get(n) {
                         Some(val) => val,
@@ -1332,7 +1331,7 @@ impl TextureManager {
 
         let mut full_name = String::new();
         full_name.push_str(plugin);
-        full_name.push_str(":");
+        full_name.push(':');
         full_name.push_str(name);
 
         let tex = Texture {
@@ -1372,7 +1371,7 @@ impl TextureManager {
 
         let mut full_name = String::new();
         full_name.push_str(plugin);
-        full_name.push_str(":");
+        full_name.push(':');
         full_name.push_str(name);
 
         let t = Texture {