docs(widgets) begin adding support for building live examples

scripts/build_html_examples.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -e
+CURRENT_REF="$(git rev-parse HEAD)"
+rm -rf emscripten_builder
+git clone https://github.com/lvgl/lv_sim_emscripten.git emscripten_builder
+scripts/genexamplelist.sh > emscripten_builder/examplelist.c
+cd emscripten_builder
+git submodule update --init -- lvgl
+cd lvgl
+git checkout $CURRENT_REF
+cd ..
+git submodule update --init -- lv_drivers
+make -j$(nproc) CHOSEN_DEMO=lv_example_noop || exit 1
+cd ..
+cp -a emscripten_builder/build docs/_static/built_lv_examples

scripts/genexamplelist.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+echo "/* Autogenerated */"
+echo '#include <stddef.h>'
+echo '#include "examplelist.h"'
+TMPFILE=$(mktemp)
+find examples -name \*.h | xargs grep -h "^void lv_example" | sed 's/(/ /g' | awk '{print $2}' > $TMPFILE
+cat $TMPFILE | while read -r line; do
+echo "extern void ${line}(void);"
+done
+echo "const struct lv_ci_example lv_ci_example_list[] = {"
+cat $TMPFILE | while read -r line; do
+echo "    { \"$line\", $line },";
+done
+echo "    { NULL, NULL }"
+echo "};"