fix(completions/zsh.rs): Don't pass -S to _arguments if Zsh is too old

If you do pass it than _arguments considers -C as a possible option in
the completions.

src/completions/zsh.rs

@@ -33,8 +33,15 @@ impl<'a, 'b> ZshGen<'a, 'b> {
 
 _{name}() {{
     typeset -A opt_args
+    typeset -a _arguments_options
     local ret=1
 
+    if is-at-least 5.2; then
+        _arguments_options=(-s -S -C)
+    else
+        _arguments_options=(-s -C)
+    fi
+
     local context curcontext=\"$curcontext\" state line
     {initial_args}
     {subcommands}
@@ -275,7 +282,7 @@ fn parser_of<'a, 'b>(p: &'b Parser<'a, 'b>, sc: &str) -> &'b Parser<'a, 'b> {
 //    -S: Do not complete anything after '--' and treat those as argument values
 fn get_args_of(p: &Parser) -> String {
     debugln!("get_args_of;");
-    let mut ret = vec![String::from("_arguments -s -S -C \\")];
+    let mut ret = vec![String::from("_arguments \"${_arguments_options[@]}\" \\")];
     let opts = write_opts_of(p);
     let flags = write_flags_of(p);
     let positionals = write_positionals_of(p);

tests/completions.rs

@@ -91,10 +91,17 @@ static ZSH: &'static str = r#"#compdef myapp
 
 _myapp() {
     typeset -A opt_args
+    typeset -a _arguments_options
     local ret=1
 
+    if is-at-least 5.2; then
+        _arguments_options=(-s -S -C)
+    else
+        _arguments_options=(-s -C)
+    fi
+
     local context curcontext="$curcontext" state line
-    _arguments -s -S -C \
+    _arguments "${_arguments_options[@]}" \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
 '-V[Prints version information]' \
@@ -110,7 +117,7 @@ _myapp() {
         curcontext="${curcontext%:*:*}:myapp-command-$line[2]:"
         case $line[2] in
             (test)
-_arguments -s -S -C \
+_arguments "${_arguments_options[@]}" \
 '--case=[the case to test]' \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
@@ -119,7 +126,7 @@ _arguments -s -S -C \
 && ret=0
 ;;
 (help)
-_arguments -s -S -C \
+_arguments "${_arguments_options[@]}" \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
 '-V[Prints version information]' \
@@ -382,10 +389,17 @@ static ZSH_SPECIAL_CMDS: &'static str = r#"#compdef my_app
 
 _my_app() {
     typeset -A opt_args
+    typeset -a _arguments_options
     local ret=1
 
+    if is-at-least 5.2; then
+        _arguments_options=(-s -S -C)
+    else
+        _arguments_options=(-s -C)
+    fi
+
     local context curcontext="$curcontext" state line
-    _arguments -s -S -C \
+    _arguments "${_arguments_options[@]}" \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
 '-V[Prints version information]' \
@@ -401,7 +415,7 @@ _my_app() {
         curcontext="${curcontext%:*:*}:my_app-command-$line[2]:"
         case $line[2] in
             (test)
-_arguments -s -S -C \
+_arguments "${_arguments_options[@]}" \
 '--case=[the case to test]' \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
@@ -410,7 +424,7 @@ _arguments -s -S -C \
 && ret=0
 ;;
 (some_cmd)
-_arguments -s -S -C \
+_arguments "${_arguments_options[@]}" \
 '--config=[the other case to test]' \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
@@ -419,15 +433,15 @@ _arguments -s -S -C \
 && ret=0
 ;;
 (some-cmd-with-hypens)
-_arguments -s -S -C \
+_arguments "${_arguments_options[@]}" \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
 '-V[Prints version information]' \
 '--version[Prints version information]' \
 && ret=0
 ;;
 (help)
-_arguments -s -S -C \
+_arguments "${_arguments_options[@]}" \
 '-h[Prints help information]' \
 '--help[Prints help information]' \
 '-V[Prints version information]' \
@@ -661,10 +675,17 @@ static ZSH_SPECIAL_HELP: &'static str = r#"#compdef my_app
 
 _my_app() {
     typeset -A opt_args
+    typeset -a _arguments_options
     local ret=1
 
+    if is-at-least 5.2; then
+        _arguments_options=(-s -S -C)
+    else
+        _arguments_options=(-s -C)
+    fi
+
     local context curcontext="$curcontext" state line
-    _arguments -s -S -C \
+    _arguments "${_arguments_options[@]}" \
 '--single-quotes[Can be '\''always'\'', '\''auto'\'', or '\''never'\'']' \
 '--double-quotes[Can be "always", "auto", or "never"]' \
 '--backticks[For more information see `echo test`]' \