using [[ instead of [ in conditionals

rtenets

@@ -82,7 +82,7 @@ check_api_prerequisites() {
 
 # ----------------- Gitea API commands -----------------------
 get_gitea_token(){
-    if [ -f token ]; then
+    if [[ -f token ]]; then
         read TOKEN < token
     else
         TOKEN="$(enter "gitea token: ")"
@@ -94,13 +94,15 @@ get_gitea_token(){
 gitea() {
     check_api_prerequisites
 
-    if [ -z ${TOKEN+x} ]; then
+    if [[ -z ${TOKEN+x} ]]; then
         get_gitea_token
     fi
 
     local method="$1"
     local request="$2"
-    \curl -X "${request}" -H "Content-Type: application/json" -H "Authorization: token ${TOKEN}" "${ENDPOINT}/${method}"
+    \curl -X "${request}" \
+          -H "Content-Type: application/json" \
+          -H "Authorization: token ${TOKEN}" "${ENDPOINT}/${method}"
 }
 
 # ----------------- Git commands -----------------------
@@ -109,7 +111,7 @@ gitea() {
 set_git_config() {
     local param="$1"
     local value=''
-    while ! [ -n "${value}" ]; do
+    while ! [[ -n "${value}" ]]; do
         value="$(enter "new value for ${param}: ")"
     done
     \git config --global "${param}" "${value}"
@@ -121,7 +123,7 @@ set_git_config() {
 get_git_config() {
     local param="$1"
     local value="$(git config "${param}")"
-    if ! [ -n "${value}" ]; then
+    if ! [[ -n "${value}" ]]; then
         warning "git ${param} is unset"
         value="$(set_git_config "${param}")"
     fi
@@ -150,7 +152,7 @@ script_stub() {
     local script_name="$1"
     local start_phrase="$2"
 
-    if ! [ -f "${script_name}" ]; then
+    if ! [[ -f "${script_name}" ]]; then
         mkdir -p "$(dirname "${script_name}")"
         cat << STUB > "${script_name}"
 #!/usr/bin/env bash
@@ -171,7 +173,7 @@ STUB
 fetch_licence() {
     local licence="COPYING"
 
-    if ! [ -f "${licence}" ]; then
+    if ! [[ -f "${licence}" ]]; then
         if has_command curl; then
             info "setting licence to GPL by default, see https://www.gnu.org/licenses for more options"
             \curl "https://www.gnu.org/licenses/gpl-3.0.txt" > "${licence}"
@@ -185,7 +187,7 @@ fetch_licence() {
 create_readme() {
     local readme="README.md~"
 
-    if ! [ -f "${readme}" ]; then
+    if ! [[ -f "${readme}" ]]; then
         local project_name="$(enter "project name: ")"
         local project_desc="$(enter "project short description: ")"
 
@@ -222,7 +224,7 @@ READMEMSG
 }
 
 create_authors_file() {
-    if ! [ -f AUTHORS ]; then
+    if ! [[ -f AUTHORS ]]; then
         printf "%s\\n" "${USER} <${EMAIL}> ${AFFILIATION}" > AUTHORS
     fi
 }