Add a helper script to sort the config.json practice exercises

CONTRIBUTING.md

@@ -15,16 +15,16 @@ Maintainers are happy to interact with humans; maintainers are not interested in
 ```
 # Use the configlet to set things up.
 $ ./bin/fetch-configlet
-$ ./bin/configlet create --practice-exercise $slug -a $author -d $difficulty
+$ ./bin/configlet create --practice-exercise "${slug}" -a "${author}" -d "${difficulty}"
 # Sort `config.json`.
-$ sorted=$( jq '  (.exercises.practice |= sort_by(.slug)) |   .exercises.practice |= sort_by(.difficulty)' config.json ) && echo "$sorted" > config.json
+$ ./bin/sort_exercises
 # Add the test runner.
 $ ./bin/update_test_runner
 # It's recommended you copy a .meta/template.j2 from another exercise as a starting point.
 # Edit the template file and use it to regenerate tests. The problem spec repo should be updated at least once.
 $ ./bin/generate_tests [--no-pull]
 # Solve the exercise and validate by running the tests.
-$ ( cd exercises/practice/$slug && bash run_tests; )
+$ ( cd "exercises/practice/${slug}" && bash run_tests; )
 ```
 
 ### Error handling

bin/sort_exercises

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+self=$(readlink -e "$0")
+bin=${self%/*}
+
+# shellcheck disable=SC1091
+. "${bin}/utils.bash"
+
+config="${REPO_ROOT}/config.json"
+
+sorted=$( jq '
+    (.exercises.practice |= sort_by(.name | ascii_downcase)) |
+    .exercises.practice |= sort_by(.difficulty)
+' "${config}" )
+printf '%s\n' "${sorted}" > "${config}"