Add debug mappings

README.asciidoc

@@ -685,7 +685,7 @@ Some commands take an exclamation mark (`!`), which can be used to force
 the execution of the command (i.e. to quit a modified buffer, the
 command `q!` has to be used).
 
- * `cd [<directory>]`: change the current directory to `<directory>`, or the home directory is unspecified
+ * `cd [<directory>]`: change the current directory to `<directory>`, or the home directory if unspecified
  * `doc <topic>`: display documentation about a topic. The completion list
      displays the available topics.
  * `e[dit][!] <filename> [<line> [<column>]]`: open buffer on file, go to given
@@ -1597,7 +1597,7 @@ Some helper commands can be used to define composite commands:
  * `reg <name> <content>`: set register <name> to <content>
  * `select <anchor_line>.<anchor_column>,<cursor_line>.<cursor_column>:...`:
      replace the current selections with the one described in the argument
- * `debug {info,buffers,options,memory,shared-strings,profile-hash-maps,faces}`:
+ * `debug {info,buffers,options,memory,shared-strings,profile-hash-maps,faces,mappings}`:
      print some debug information in the `*debug*` buffer
 
 Note that these commands are available in interactive command mode, but are

doc/manpages/commands.asciidoc

@@ -221,7 +221,7 @@ commands:
 *select* <anchor_line>.<anchor_column>,<cursor_line>.<cursor_column>:...::
 	replace the current selections with the one described in the argument
 
-*debug* {info,buffers,options,memory,shared-strings,profile-hash-maps,faces}::
+*debug* {info,buffers,options,memory,shared-strings,profile-hash-maps,faces,mappings}::
 	print some debug information in the *\*debug** buffer
 
 Note that those commands are also available in the interactive mode, but

src/commands.cc

@@ -1111,6 +1111,19 @@ const CommandDesc echo_cmd = {
     }
 };
 
+KeymapMode parse_keymap_mode(const String& str)
+{
+    if (prefix_match("normal", str)) return KeymapMode::Normal;
+    if (prefix_match("insert", str)) return KeymapMode::Insert;
+    if (prefix_match("menu", str))   return KeymapMode::Menu;
+    if (prefix_match("prompt", str)) return KeymapMode::Prompt;
+    if (prefix_match("goto", str))   return KeymapMode::Goto;
+    if (prefix_match("view", str))   return KeymapMode::View;
+    if (prefix_match("user", str))   return KeymapMode::User;
+    if (prefix_match("object", str)) return KeymapMode::Object;
+
+    throw runtime_error(format("unknown keymap mode '{}'", str));
+}
 
 const CommandDesc debug_cmd = {
     "debug",
@@ -1124,7 +1137,7 @@ const CommandDesc debug_cmd = {
         [](const Context& context, CompletionFlags flags,
            const String& prefix, ByteCount cursor_pos) -> Completions {
                auto c = {"info", "buffers", "options", "memory", "shared-strings",
-                         "profile-hash-maps", "faces"};
+                         "profile-hash-maps", "faces", "mappings"};
                return { 0_byte, cursor_pos, complete(prefix, cursor_pos, c) };
     }),
     [](const ParametersParser& parser, Context& context, const ShellContext&)
@@ -1180,6 +1193,21 @@ const CommandDesc debug_cmd = {
             for (auto& face : FaceRegistry::instance().aliases())
                 write_to_debug_buffer(format(" * {}: {}", face.key, face.value.face));
         }
+        else if (parser[0] == "mappings")
+        {
+            auto& keymaps = context.keymaps();
+            auto modes = {"normal", "insert", "prompt", "menu",
+                          "goto", "view", "user", "object"};
+            write_to_debug_buffer("Mappings:");
+            for (auto& mode : modes)
+            {
+                KeymapMode m = parse_keymap_mode(mode);
+                for (auto& key : keymaps.get_mapped_keys(m))
+                    write_to_debug_buffer(format(" * {} {}: {}",
+                                          mode, key_to_str(key),
+                                          keymaps.get_mapping(key, m).docstring));
+            }
+        }
         else
             throw runtime_error(format("unknown debug command '{}'", parser[0]));
     }
@@ -1394,20 +1422,6 @@ const CommandDesc declare_option_cmd = {
     }
 };
 
-KeymapMode parse_keymap_mode(const String& str)
-{
-    if (prefix_match("normal", str)) return KeymapMode::Normal;
-    if (prefix_match("insert", str)) return KeymapMode::Insert;
-    if (prefix_match("menu", str))   return KeymapMode::Menu;
-    if (prefix_match("prompt", str)) return KeymapMode::Prompt;
-    if (prefix_match("goto", str))   return KeymapMode::Goto;
-    if (prefix_match("view", str))   return KeymapMode::View;
-    if (prefix_match("user", str))   return KeymapMode::User;
-    if (prefix_match("object", str)) return KeymapMode::Object;
-
-    throw runtime_error(format("unknown keymap mode '{}'", str));
-}
-
 auto map_key_completer =
     [](const Context& context, CompletionFlags flags,
        CommandParameters params, size_t token_to_complete,