add -s alias for --skip-lock (#24)

Author: connesy

src/venv-cli/venv.sh

@@ -165,13 +165,13 @@ venv::deactivate() {
 
 venv::install() {
   if venv::_check_if_help_requested "$1"; then
-    echo "venv install [<requirements file>] [--skip-lock] [<install args>]"
+    echo "venv install [<requirements file>] [--skip-lock|-s] [<install args>]"
     echo
     echo "Clear the environment, then install requirements from <requirements file>,"
     echo "like 'requirements.txt' or 'requirements.lock'."
     echo "Installed packages are then locked into the corresponding .lock-file,"
     echo "e.g. 'venv install requirements.txt' will lock packages into 'requirements.lock'."
-    echo "This step is skipped if '--skip-lock' is specified, or when installing"
+    echo "This step is skipped if '--skip-lock' or '-s' is specified, or when installing"
     echo "directly from a .lock-file."
     echo
     echo "The <requirements file> must be in the form '*requirements.[txt|lock]'."
@@ -185,12 +185,12 @@ venv::install() {
     echo
     echo "$ venv install dev-requirements.txt"
     echo
-    echo "$ venv install requirements.txt --skip-lock --no-cache"
+    echo "$ venv install requirements.txt --skip-lock|-s --no-cache"
     return "${_success}"
   fi
 
   local requirements_file
-  if [ -z "$1" ] || [ "$1" = "--skip-lock" ]; then
+  if [ -z "$1" ] || [ "$1" = "--skip-lock" ] || [ "$1" = "-s" ]; then
     # If no filename was passed
     requirements_file="requirements.txt"
 
@@ -206,7 +206,7 @@ venv::install() {
   fi
 
   local skip_lock=false
-  if [ "$1" = "--skip-lock" ]; then
+  if [ "$1" = "--skip-lock" ] || [ "$1" = "-s" ]; then
     skip_lock=true
     shift
   fi