[BUGFIX] install.sh: Fix gsync not updating to latest when using branch

* improve _get_files_and_commits logic

install.sh

@@ -193,16 +193,24 @@ _get_files_and_commits() {
     # shellcheck disable=SC2086
     html_get_files_and_commits="$(curl -s --compressed "https://github.com/${repo_get_files_and_commits}/file-list/${type_value_get_files_and_commits}/${path_get_files_and_commits}")" ||
         { _print_center "normal" "Error: Cannot fetch" " update details" "=" 1>&2 && exit 1; }
+    # just grep the commit/ strings from html, then remove extra info with sed
     commits_get_files_and_commits="$(printf "%s\n" "${html_get_files_and_commits}" | grep -o "commit/.*\"" | sed -e 's/commit\///g' -e 's/\"//g' -e 's/>.*//g')"
+    # only grep blob because we just want files
     # shellcheck disable=SC2001
-    files_get_files_and_commits="$(printf "%s\n" "${html_get_files_and_commits}" | grep -oE '(blob|tree)/'"${type_value_get_files_and_commits}"'.*\"' | sed -e 's/\"//g' -e 's/>.*//g')"
+    files_get_files_and_commits="$(printf "%s\n" "${html_get_files_and_commits}" | grep -oE 'blob/'"${type_value_get_files_and_commits}"'.*\"' | sed -e 's/\"//g' -e 's/>.*//g')"
 
     total_files="$(($(printf "%s\n" "${files_get_files_and_commits}" | wc -l)))"
     total_commits="$(($(printf "%s\n" "${commits_get_files_and_commits}" | wc -l)))"
-    if [ "$((total_files - 2))" -eq "${total_commits}" ]; then
-        files_get_files_and_commits="$(printf "%s\n" "${files_get_files_and_commits}" | sed 1,2d)"
-    elif [ "${total_files}" -gt "${total_commits}" ]; then
-        files_get_files_and_commits="$(printf "%s\n" "${files_get_files_and_commits}" | sed 1d)"
+
+    # exit right out in case wasn't able to grab commits or files
+    if [ "${total_commits}" -eq "0" ] || [ "${total_files}" -eq "0" ]; then
+        _print_center "normal" "Error: Cannot fetch" " update details" "=" 1>&2 && exit 1
+    fi
+
+    # this is gonna trigger in case of non-release commit sha
+    if [ "${total_commits}" -gt "${total_files}" ]; then
+        # delete alternate lines ( sed '{N;P;d}' ), because duplicate for every commit
+        commits_get_files_and_commits="$(printf "%s\n" "${commits_get_files_and_commits}" | sed -e 'N;P;d')"
     fi
 
     exec 4<< EOF
@@ -213,7 +221,7 @@ $(printf "%s\n" "${commits_get_files_and_commits}")
 EOF
     while read -r file <&4 && read -r commit <&5; do
         printf "%s\n" "${file##blob\/${type_value_get_files_and_commits}\/}__.__${commit}"
-    done | grep -v tree || :
+    done
     exec 4<&- && exec 5<&-
 
     return 0