fix sed command on macOS

Author: folkertdev

.github/workflows/bench.yml

@@ -53,7 +53,12 @@ jobs:
           cp target/${{matrix.target}}/release/examples/blogpost-compress .
           cp target/${{matrix.target}}/release/examples/blogpost-uncompress .
           # switch the C implementation from zlib-ng to zlib-chromium
-          sed -i '/^libz-sys =/c\libz-sys = { git = "https://github.com/folkertdev/libz-chromium-sys", rev = "4671e8e16bf277d06ff2397e3091db3515c6f934", default-features = false, features = ["zlib-ng"] }' Cargo.toml
+          # sed on macOS is a bit annoying
+          if sed --version 2>/dev/null | grep -q GNU; then
+              sed -i '/^libz-sys =/c\libz-sys = { git = "https://github.com/folkertdev/libz-chromium-sys", rev = "4671e8e16bf277d06ff2397e3091db3515c6f934", default-features = false, features = ["zlib-ng"] }' Cargo.toml
+          else
+              printf '%s\n' '/^libz-sys =/c\' 'libz-sys = { git = "https://github.com/folkertdev/libz-chromium-sys", rev = "4671e8e16bf277d06ff2397e3091db3515c6f934", default-features = false, features = ["zlib-ng"] }' | sed -i '' -f - Cargo.toml
+          fi
           cargo build --target ${{matrix.target}} -p test-libz-rs-sys --release --examples
           cp target/${{matrix.target}}/release/examples/blogpost-compress blogpost-compress-chromium
           cp target/${{matrix.target}}/release/examples/blogpost-uncompress blogpost-uncompress-chromium