add-practice-exercise copies templates (#9)

Author: keiravillekode

.gitignore

@@ -5,3 +5,7 @@ bin/configlet.exe
 bin/latest-configlet.tar.gz
 bin/latest-configlet.zip
 bin/configlet.zip
+
+# Lake build artifacts
+.lake/
+lake-manifest.json

bin/add-practice-exercise

@@ -36,6 +36,15 @@ require_files_template() {
         die "The '.files.${1}' array in the 'config.json' file is empty. Please add at least one file. See https://exercism.org/docs/building/tracks/config-json#h-files for more information."
 }
 
+toPascalCase() {
+    # "some-kebab-case-word" => "SomeKebabCaseWord"
+    local word=${1^}
+    while [[ ${word} =~ (.*)-(.*) ]]; do
+        word=${BASH_REMATCH[1]}${BASH_REMATCH[2]^}
+    done
+    echo "${word}"
+}
+
 required_tool jq
 
 require_files_template "solution"
@@ -59,6 +68,7 @@ shift "$((OPTIND - 1))"
 (( $# >= 1 )) || help_and_exit
 
 slug="${1}"
+pascal=$(toPascalCase "${slug}")
 
 if [[ -z "${author}" ]]; then
     read -rp 'Your GitHub username: ' author
@@ -68,8 +78,12 @@ fi
 ./bin/configlet create --practice-exercise "${slug}" --author "${author}" --difficulty "${difficulty}"
 
 exercise_dir="exercises/practice/${slug}"
+sed -e "s#%{kebab_slug}#${slug}#g" templates/lakefile.toml | sed -e "s#%{pascal_slug}#${pascal}#g" > "${exercise_dir}/lakefile.toml"
 files=$(jq -r --arg dir "${exercise_dir}" '.files | to_entries | map({key: .key, value: (.value | map("'"'"'" + $dir + "/" + . + "'"'"'") | join(" and "))}) | from_entries' "${exercise_dir}/.meta/config.json")
 
+cp templates/lean-toolchain "exercises/practice/${slug}/lean-toolchain"
+cp -r templates/vendor "exercises/practice/${slug}/vendor"
+
 cat << NEXT_STEPS
 
 Your next steps are:

exercises/practice/hello-world/.meta/config.json

@@ -1,5 +1,7 @@
 {
-  "authors": [],
+  "authors": [
+    "tim-br"
+  ],
   "files": {
     "solution": [
       "HelloWorld.lean"