Add support for hidden options, not showed by completion

the decl command can take a -hidden parameter to hide an option

README.asciidoc

@@ -398,9 +398,12 @@ window scope (+BOM+ or +eolformat+ for example).
 
 New options can be declared using the +:decl+ command:
 
------------------------------
+---------------------------------------
-:decl <type> <name> [<value>]
+:decl [-hidden] <type> <name> [<value>]
------------------------------
+---------------------------------------
+
+the +-hidden+ parameter makes the option invisible in completion, but
+still modifiable.
 
 Some options are built in kakoune, and can be used to control it's behaviour:
 

src/commands.cc

@@ -458,29 +458,36 @@ void set_option(CommandParameters params, Context& context)
 
 void declare_option(CommandParameters params, Context& context)
 {
-    if (params.size() != 2 and params.size() != 3)
+    ParametersParser parser(params, { { "hidden", false } },
-        throw wrong_argument_count();
+                            ParametersParser::Flags::OptionsOnlyAtStart,
+                            2, 3);
     Option* opt = nullptr;
 
-    if (params[0] == "int")
+    Option::Flags flags = Option::Flags::None;
-        opt = &GlobalOptions::instance().declare_option<int>(params[1], 0);
+    if (parser.has_option("hidden"))
-    if (params[0] == "bool")
+        flags = Option::Flags::Hidden;
-        opt = &GlobalOptions::instance().declare_option<bool>(params[1], 0);
-    else if (params[0] == "str")
-        opt = &GlobalOptions::instance().declare_option<String>(params[1], "");
-    else if (params[0] == "regex")
-        opt = &GlobalOptions::instance().declare_option<Regex>(params[1], Regex{});
-    else if (params[0] == "int-list")
-        opt = &GlobalOptions::instance().declare_option<std::vector<int>>(params[1], {});
-    else if (params[0] == "str-list")
-        opt = &GlobalOptions::instance().declare_option<std::vector<String>>(params[1], {});
-    else if (params[0] == "line-flag-list")
-        opt = &GlobalOptions::instance().declare_option<std::vector<LineAndFlag>>(params[1], {});
-    else
-        throw runtime_error("unknown type " + params[0]);
 
-    if (params.size() == 3)
+    GlobalOptions& opts = GlobalOptions::instance();
-        opt->set_from_string(params[2]);
+
+    if (parser[0] == "int")
+        opt = &opts.declare_option<int>(parser[1], 0, flags);
+    if (parser[0] == "bool")
+        opt = &opts.declare_option<bool>(parser[1], 0, flags);
+    else if (parser[0] == "str")
+        opt = &opts.declare_option<String>(parser[1], "", flags);
+    else if (parser[0] == "regex")
+        opt = &opts.declare_option<Regex>(parser[1], Regex{}, flags);
+    else if (parser[0] == "int-list")
+        opt = &opts.declare_option<std::vector<int>>(parser[1], {}, flags);
+    else if (parser[0] == "str-list")
+        opt = &opts.declare_option<std::vector<String>>(parser[1], {}, flags);
+    else if (parser[0] == "line-flag-list")
+        opt = &opts.declare_option<std::vector<LineAndFlag>>(parser[1], {}, flags);
+    else
+        throw runtime_error("unknown type " + parser[0]);
+
+    if (parser.positional_count() == 3)
+        opt->set_from_string(parser[2]);
 }
 
 

src/option_manager.cc

@@ -7,8 +7,8 @@
 namespace Kakoune
 {
 
-Option::Option(OptionManager& manager, String name)
+Option::Option(OptionManager& manager, String name, Flags flags)
-    : m_manager(manager), m_name(std::move(name)) {}
+    : m_manager(manager), m_name(std::move(name)), m_flags(flags) {}
 
 OptionManager::OptionManager(OptionManager& parent)
     : m_parent(&parent)
@@ -72,6 +72,9 @@ CandidateList OptionManager::complete_option_name(const String& prefix,
         result = m_parent->complete_option_name(prefix, cursor_pos);
     for (auto& option : m_options)
     {
+        if (option->flags() & Option::Flags::Hidden)
+            continue;
+
         const auto& name = option->name();
         if (prefix_match(name, real_prefix) and not contains(result, name))
             result.push_back(name);
@@ -123,6 +126,7 @@ GlobalOptions::GlobalOptions()
     declare_option<std::vector<String>>("completions", {});
     declare_option<std::vector<String>>("path", { "./", "/usr/include" });
     declare_option<std::vector<String>>("completers", {"option", "filename", "word=buffer"},
+                                        Option::Flags::None,
                                         [](const std::vector<String>& s) {
                                             static const auto values = {"option", "word=buffer", "word=all", "filename" };
                                             for (auto& v : s)

src/option_manager.hh

@@ -22,7 +22,13 @@ class OptionManager;
 class Option : public SafeCountable
 {
 public:
-    Option(OptionManager& manager, String name);
+    enum class Flags
+    {
+        None   = 0,
+        Hidden = 1,
+    };
+
+    Option(OptionManager& manager, String name, Flags flags);
     virtual ~Option() {}
 
     template<typename T> const T& get() const;
@@ -37,9 +43,19 @@ public:
     OptionManager& manager() const { return m_manager; }
 
     virtual Option* clone(OptionManager& manager) const = 0;
+
+    Flags flags() const { return m_flags; }
+
+    friend constexpr Flags operator|(Flags lhs, Flags rhs)
+    { return (Flags)((int)lhs | (int)rhs); }
+
+    friend constexpr bool operator&(Flags lhs, Flags rhs)
+    { return (bool)((int)lhs & (int)rhs); }
+
 protected:
     OptionManager& m_manager;
     String m_name;
+    Flags  m_flags;
 };
 
 class OptionManagerWatcher
@@ -87,9 +103,9 @@ template<typename T>
 class TypedOption : public Option
 {
 public:
-    TypedOption(OptionManager& manager, String name, const T& value,
+    TypedOption(OptionManager& manager, String name, Option::Flags flags,
-                OptionChecker<T> checker)
+                const T& value, OptionChecker<T> checker)
-        : Option(manager, std::move(name)), m_value(value),
+        : Option(manager, std::move(name), flags), m_value(value),
           m_checker(std::move(checker)) {}
 
     void set(T value)
@@ -126,7 +142,7 @@ public:
 
     Option* clone(OptionManager& manager) const override
     {
-        return new TypedOption{manager, name(), m_value, m_checker};
+        return new TypedOption{manager, name(), flags(), m_value, m_checker};
     }
 private:
     T m_value;
@@ -169,16 +185,18 @@ public:
 
     template<typename T>
     Option& declare_option(const String& name, const T& value,
+                           Option::Flags flags = Option::Flags::None,
                            OptionChecker<T> checker = OptionChecker<T>{})
     {
         auto it = find_option(m_options, name);
         if (it != m_options.end())
         {
-            if ((*it)->is_of_type<T>())
+            if ((*it)->is_of_type<T>() and (*it)->flags() == flags)
                 return **it;
-            throw runtime_error("option " + name + " already declared with different type");
+            throw runtime_error("option " + name + " already declared with different type or flags");
         }
-        m_options.emplace_back(new TypedOption<T>{*this, name, value, std::move(checker)});
+        m_options.emplace_back(new TypedOption<T>{*this, name, flags, value,
+                                                  std::move(checker)});
         return *m_options.back();
     }
 };

src/rc/clang.kak

@@ -1,4 +1,4 @@
-decl str clang_filename
+decl -hidden str clang_filename
 decl str clang_options
 
 def clang-complete %{