feat: added gitlab support, simplified version sorting with ls-remote

This allows for easier access to both GitHub and GitLab releases,
without having to modify anything new.

It also simplifies sorting by using git ls-remote's built-in --sort
functionality. Since not all projects strictly follow semver, attempts
were made to normalize it, such as if there is no `-` between a patch
version and `rc`, `prerelease`, etc.

NOTE: this does require git >= 2.18.0, so that is checked for.
NOTE: `versionsort.prereleaseSuffix` was deprecated in favor of
      `versionsort.suffix`, but per its commit will be retained.
      See git/git@c026557

It also removes the -C - parameter from curl, which was attempting to
resume downloads, querying the server for the byte range to do so. This
is not universally supported, and if the server doesn't support it, the
download will fail.

Finally, where possible, it uses shell built-ins like parameter
substitution over calling external commands. If this isn't possible, it
minimizes the number of spawned subshells by combining commands rather
than piping. This speeds up the asdf ecosystem as a whole, by minimizing syscalls.

Author: stephanGarland

template/bin/list-all

@@ -8,4 +8,4 @@ plugin_dir=$(dirname "$(dirname "$current_script_path")")
 # shellcheck source=../lib/utils.bash
 source "${plugin_dir}/lib/utils.bash"
 
-list_all_versions | sort_versions | xargs echo
+list_all_versions | xargs echo

template/lib/utils.bash

@@ -2,10 +2,20 @@
 
 set -euo pipefail
 
-# TODO: Ensure this is the correct GitHub homepage where releases can be downloaded for <YOUR TOOL>.
-GH_REPO="<TOOL REPO>"
+GIT_VERSION=$(git --version)
+GIT_VERSION=${GIT_VERSION##* }
+# TODO: Ensure this is the correct GitHub/GitLab homepage where releases can be downloaded for <YOUR TOOL>.
+REPO="<TOOL REPO>"
 TOOL_NAME="<YOUR TOOL>"
 TOOL_TEST="<TOOL CHECK>"
+IS_GITHUB=$(
+  [[ "$REPO" =~ "github" ]]
+  echo $?
+)
+
+git_supports_sort() {
+  awk '{ split($0,a,"."); if ((a[1] < 2) || (a[2] < 18)) { print "1" } else { print "0" } }' <<<"$1"
+}
 
 fail() {
   echo -e "asdf-$TOOL_NAME: $*"
@@ -14,26 +24,30 @@ fail() {
 
 curl_opts=(-fsSL)
 
-# NOTE: You might want to remove this if <YOUR TOOL> is not hosted on GitHub releases.
+if [ $(git_supports_sort "${GIT_VERSION}") -eq 1 ]; then
+  printf "must have git >= 2.18.0, have ${GIT_VERSION}\n"
+  exit 1
+fi
+
+# NOTE: You might want to remove this if <YOUR TOOL> is not hosted on GitHub or GitLab releases.
 if [ -n "${GITHUB_API_TOKEN:-}" ]; then
   curl_opts=("${curl_opts[@]}" -H "Authorization: token $GITHUB_API_TOKEN")
+elif [ -n "${GITLAB_API_TOKEN:-}" ]; then
+  curl_opts=("${curl_opts[@]}" -H "Authorization: token $GITLAB_API_TOKEN")
 fi
 
-sort_versions() {
-  sed 'h; s/[+-]/./g; s/.p\([[:digit:]]\)/.z\1/; s/$/.z/; G; s/\n/ /' |
-    LC_ALL=C sort -t. -k 1,1 -k 2,2n -k 3,3n -k 4,4n -k 5,5n | awk '{print $2}'
-}
-
-list_github_tags() {
-  git ls-remote --tags --refs "$GH_REPO" |
-    grep -o 'refs/tags/.*' | cut -d/ -f3- |
-    sed 's/^v//' # NOTE: You might want to adapt this sed to remove non-version strings from tags
+list_remote_tags() {
+  git -c 'versionsort.prereleaseSuffix=a' -c 'versionsort.prereleaseSuffix=b' \
+    -c 'versionsort.prereleaseSuffix=r' -c 'versionsort.prereleaseSuffix=p' \
+    -c 'versionsort.prereleaseSuffix=-' -c 'versionsort.prereleaseSuffix=_' \
+    ls-remote --exit-code --tags --refs --sort="version:refname" "$REPO" |
+    awk -F'[/v]' '{ print $NF }' || fail "no releases found"
 }
 
 list_all_versions() {
   # TODO: Adapt this. By default we simply list the tag names from GitHub releases.
   # Change this function if <YOUR TOOL> has other means of determining installable versions.
-  list_github_tags
+  list_remote_tags
 }
 
 download_release() {
@@ -42,10 +56,14 @@ download_release() {
   filename="$2"
 
   # TODO: Adapt the release URL convention for <YOUR TOOL>
-  url="$GH_REPO/archive/v${version}.tar.gz"
-
+  if [ $IS_GITHUB -eq 0 ]; then
+    url="$REPO/archive/v${version}.tar.gz"
+  else
+    url="$REPO/-/archive/${version}/${TOOL_NAME}-${version}.tar.gz"
+  fi
+  printf "%s: %s\n" "url" "$url"
   echo "* Downloading $TOOL_NAME release $version..."
-  curl "${curl_opts[@]}" -o "$filename" -C - "$url" || fail "Could not download $url"
+  curl "${curl_opts[@]}" -o "$filename" "$url" || fail "Could not download $url"
 }
 
 install_version() {