Reduce repetition in run-examples.sh

app-proto/run-examples.sh

@@ -3,8 +3,18 @@
 #   Karol Kuczmarski. "Add examples to your Rust libraries"
 #   http://xion.io/post/code/rust-examples.html
 #
+# you should invoke this script by calling `sh` or another interpreter, rather
+# than calling `souce`, to ensure that the script can find the manifest file for
+# the application prototype
 
-cargo run --example irisawa-hexlet; echo
+# find the manifest file for the application prototype
-cargo run --example three-spheres; echo
+MANIFEST="$(dirname -- $0)/Cargo.toml"
-cargo run --example point-on-sphere; echo
+
-cargo run --example kaleidocycle
+# set up the command that runs each example
+RUN_EXAMPLE="cargo run --manifest-path $MANIFEST --example"
+
+# run the examples
+$RUN_EXAMPLE irisawa-hexlet; echo
+$RUN_EXAMPLE three-spheres; echo
+$RUN_EXAMPLE point-on-sphere; echo
+$RUN_EXAMPLE kaleidocycle