[#19]:svarga:refactor, consume external plot:: via find_package(plot) and drop vendored include/plot

.github/workflows/ci.yml

@@ -1,3 +1,7 @@
+# Core build only: the plot:: library (vargalabs/plots) is not installed here,
+# so the opt-in svg example/test auto-skip via find_package(plot). svg coverage
+# is exercised locally until plot is installable in CI (no private cross-repo
+# checkout/auth wired up).
 name: ci
 
 on:

.gitignore

@@ -1,5 +1,6 @@
 # build
 /build/
+/build_*/
 /cmake-build-*/
 *.o
 *.a

CMakeLists.txt

@@ -15,6 +15,11 @@ target_include_directories(bench INTERFACE
 )
 target_compile_features(bench INTERFACE cxx_std_23)
 
+# Optional external plot:: library (vargalabs/plots). When present, the opt-in
+# SVG sink example/test (include/bench/sink/svg.hpp -> <plot/all>) is built;
+# when absent the bench core still configures, builds, and tests cleanly.
+find_package(plot CONFIG QUIET)
+
 option(BENCH_BUILD_TESTS "Build smoke tests" ON)
 if(BENCH_BUILD_TESTS)
 	enable_testing()

examples/CMakeLists.txt

@@ -20,18 +20,12 @@ add_executable(example_sinks sinks.cpp)
 target_link_libraries(example_sinks PRIVATE bench::bench)
 set_target_properties(example_sinks PROPERTIES OUTPUT_NAME sinks)
 
-add_executable(example_heatmap heatmap.cpp)
-target_link_libraries(example_heatmap PRIVATE bench::bench)
-set_target_properties(example_heatmap PROPERTIES OUTPUT_NAME heatmap)
-
-add_executable(example_svg_sink svg_sink.cpp)
-target_link_libraries(example_svg_sink PRIVATE bench::bench)
-set_target_properties(example_svg_sink PROPERTIES OUTPUT_NAME svg_sink)
-
-add_executable(example_line_chart line_chart.cpp)
-target_link_libraries(example_line_chart PRIVATE bench::bench)
-set_target_properties(example_line_chart PROPERTIES OUTPUT_NAME line_chart)
-
-add_executable(example_scatter scatter.cpp)
-target_link_libraries(example_scatter PRIVATE bench::bench)
-set_target_properties(example_scatter PROPERTIES OUTPUT_NAME scatter)
+# The svg_sink demo pulls in the opt-in <bench/sink/svg.hpp>, which needs the
+# external plot:: library. Only build it when find_package(plot) succeeded.
+if(plot_FOUND)
+	add_executable(example_svg_sink svg_sink.cpp)
+	target_link_libraries(example_svg_sink PRIVATE bench::bench plot::plot)
+	set_target_properties(example_svg_sink PROPERTIES OUTPUT_NAME svg_sink)
+else()
+	message(STATUS "plot not found — skipping svg_sink example")
+endif()