Add a 'disabled_hooks' regex option

Hooks whose group matches this regex wont get executed.

README.asciidoc

@@ -552,6 +552,8 @@ Some options are built in Kakoune, and can be used to control it's behaviour:
  * +ignored_files+ _regex_: filenames matching this regex wont be considered
    as candidates on filename completion (except if the text being completed
    already matches it).
+ * +disabled_hooks+ _regex_: hooks whose group matches this regex wont be
+   executed. For example indentation hooks can be disabled with '.*-indent'. 
  * +filetype+ _str_: arbitrary string defining the type of the file
    filetype dependant actions should hook on this option changing for
    activation/deactivation.

src/hook_manager.cc

@@ -1,5 +1,6 @@
 #include "hook_manager.hh"
 
+#include "context.hh"
 #include "debug.hh"
 
 namespace Kakoune
@@ -45,8 +46,13 @@ void HookManager::run_hook(const String& hook_name,
     if (hook_list_it == m_hook.end())
         return;
 
+    auto& disabled_hooks = context.options()["disabled_hooks"].get<Regex>();
     for (auto& hook : hook_list_it->second)
     {
+        if (not hook.first.empty() and not disabled_hooks.empty() and
+            boost::regex_match(hook.first, disabled_hooks))
+            continue;
+
         try
         {
             hook.second(param, context);

src/option_manager.cc

@@ -157,6 +157,9 @@ GlobalOptions::GlobalOptions()
     declare_option("ignored_files",
                    "patterns to ignore when completing filenames",
                    Regex{R"(^(\..*|.*\.(o|so|a))$)"});
+    declare_option("disabled_hooks",
+                   "patterns to disable hooks whose group is matched",
+                   Regex{});
     declare_option("filetype", "buffer filetype", ""_str);
     declare_option("path", "path to consider when trying to find a file",
                    std::vector<String>({ "./", "/usr/include" }));