added a new CI pipeline

.github/workflows/ci.yaml

@@ -0,0 +1,70 @@
+name: ci
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  rustfmt:
+    name: Check rustfmt
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - run: cargo fmt --all -- --check
+
+  test:
+    name: Run linter
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/main'
+    env:
+      RUSTFLAGS: -D warnings
+      RUSTDOCFLAGS: -D warnings
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - uses: hecrj/setup-rust-action@v1
+        with:
+          components: clippy
+      - name: Cache cargo directories
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+            ${{ runner.os }}-cargo-
+      - name: Cache cargo target dirs
+        uses: actions/cache@v2
+        with:
+          path: target
+          key: ${{ runner.os }}-target-lint-stable-${{ hashFiles('**/Cargo.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-target-lint-stable-${{ hashFiles('**/Cargo.toml') }}
+            ${{ runner.os }}-target-lint-stable-
+            ${{ runner.os }}-target-lint-
+
+      - name: all features
+        run: cargo clippy
+
+      - name: no features
+        run: cargo clippy --no-default-features
+
+      - name: examples, all features
+        run: cargo clippy --examples
+
+      - name: examples, no features
+        run: cargo clippy --examples --no-default-features
+
+      - name: tests
+        run: cargo clippy --examples --no-default-features
+
+      - name: examples, all features
+        run: cargo test
+
+      - name: examples, no features
+        run: cargo test --no-default-features

src/lib.rs

@@ -5,8 +5,8 @@
 use std::{borrow::Cow, error::Error, fmt::Display, mem::size_of, num::NonZeroU32, rc::Rc};
 
 use imgui::{
-    internal::RawWrapper, BackendFlags, Context as ImGuiContext, DrawCmd, DrawCmdParams, DrawData,
-    DrawIdx, DrawVert, FontAtlas, TextureId, Textures,
+    internal::RawWrapper, Context as ImGuiContext, DrawCmd, DrawCmdParams, DrawData, DrawIdx,
+    DrawVert, FontAtlas, TextureId, Textures,
 };
 
 use crate::versions::{GlVersion, GlslVersion};
@@ -493,7 +493,7 @@ impl Renderer {
             imgui_context
                 .io_mut()
                 .backend_flags
-                .insert(BackendFlags::RENDERER_HAS_VTX_OFFSET);
+                .insert(imgui::BackendFlags::RENDERER_HAS_VTX_OFFSET);
         }
     }
 
@@ -616,7 +616,8 @@ impl GlStateBackup {
         }
     }
 
-    fn pre_render(&mut self, gl: &Context, gl_version: GlVersion) {
+    // note: the CFG is because `gl_version` is unused in `no-default-features`
+    fn pre_render(&mut self, gl: &Context, #[allow(unused_variables)] gl_version: GlVersion) {
         #[allow(clippy::cast_sign_loss)]
         unsafe {
             self.active_texture = gl.get_parameter_i32(glow::ACTIVE_TEXTURE) as _;
@@ -1085,9 +1086,9 @@ fn gl_debug_message<G: glow::HasContext>(gl: &G, message: impl AsRef<str>) {
 #[cfg(any(target_vendor = "apple", not(feature = "debug_message_insert_support")))]
 fn gl_debug_message<G: glow::HasContext>(_gl: &G, _message: impl AsRef<str>) {}
 
+#[cfg_attr(not(feature = "clip_origin_support"), allow(unused_variables))]
+#[allow(clippy::deprecated_cfg_attr)]
 fn calculate_matrix(draw_data: &DrawData, clip_origin_is_lower_left: bool) -> [f32; 16] {
-    #![allow(clippy::deprecated_cfg_attr)]
-
     let left = draw_data.display_pos[0];
     let right = draw_data.display_pos[0] + draw_data.display_size[0];
     let top = draw_data.display_pos[1];