Fix mridgers#172

clink/dll/clink_inputrc_base

@@ -23,6 +23,7 @@ C-v:                paste-from-clipboard
 C-q:                reload-lua-state
 C-z:                undo
 M-h:                show-rl-help
+M-C-h:              show-rl-history
 M-C-c:              copy-line-to-clipboard
 C-c:                ctrl-c
 M-a:                "..\\"

clink/dll/exec.lua

@@ -145,4 +145,20 @@ end
 --------------------------------------------------------------------------------
 clink.register_match_generator(exec_match_generator, 50)
 
+
+local function history_match_generator(text, first, last)
+    leading = rl_state.line_buffer:sub(1, last):lower()
+    if not leading:find("^!") then
+        return false
+    end
+
+    idx = tonumber(leading:sub(2))
+    line = clink.get_history_at(idx)
+    clink.add_match(line)
+
+    return true
+end
+--------------------------------------------------------------------------------
+clink.register_match_generator(history_match_generator, 1)
+
 -- vim: expandtab

clink/dll/lua.c

@@ -331,6 +331,30 @@ static int get_env(lua_State* state)
     return 1;
 }
 
+//------------------------------------------------------------------------------
+static int get_history_at(lua_State* state)
+{
+    char* buffer;
+
+    if (lua_gettop(state) == 0)
+    {
+        return 0;
+    }
+
+    if (lua_isnil(state, 1))
+    {
+        return 0;
+    }
+
+    unsigned idx = lua_tonumber(state, 1);
+    HIST_ENTRY * hist = history_get(idx);
+    buffer = strdup(hist->line);
+    lua_pushstring(state, buffer);
+    free(buffer);
+
+    return 1;
+}
+
 //------------------------------------------------------------------------------
 static int get_env_var_names(lua_State* state)
 {
@@ -662,6 +686,7 @@ lua_State* initialise_lua()
         { "get_console_aliases", get_console_aliases },
         { "get_cwd", get_cwd },
         { "get_env", get_env },
+        { "get_history_at", get_history_at },
         { "get_env_var_names", get_env_var_names },
         { "get_host_process", get_host_process },
         { "get_rl_variable", get_rl_variable },

clink/dll/rl_funcs.c

@@ -25,6 +25,7 @@
 //------------------------------------------------------------------------------
 void                enter_scroll_mode(int);
 int                 show_rl_help(int, int);
+int                 show_rl_history(int, int);
 int                 get_clink_setting_int(const char*);
 
 //------------------------------------------------------------------------------
@@ -254,6 +255,7 @@ void clink_register_rl_funcs()
     rl_add_funmap_entry("page-up", page_up);
     rl_add_funmap_entry("up-directory", up_directory);
     rl_add_funmap_entry("show-rl-help", show_rl_help);
+    rl_add_funmap_entry("show-rl-history", show_rl_history);
     rl_add_funmap_entry("copy-line-to-clipboard", copy_line_to_clipboard);
     rl_add_funmap_entry("expand-env-vars", expand_env_vars);
 }

clink/dll/rl_help.c

@@ -192,3 +192,32 @@ int show_rl_help(int count, int invoking_key)
     free(collector);
     return 0;
 }
+
+#define MAX_HIST_LENGTH 1000
+//------------------------------------------------------------------------------
+int show_rl_history(int count, int invoking_key)
+{
+  HISTORY_STATE *hist = history_get_history_state();
+  int max = 16;
+  int length = min(hist->length, MAX_HIST_LENGTH);
+  char* collector[MAX_HIST_LENGTH];
+
+  int longest = 1;
+  for (int i = 0; i < length; ++i) {
+    HIST_ENTRY* h = hist->entries[i];
+    size_t line_len = strlen(h->line) + strlen("1000: ") + 1;
+    char * line = malloc(line_len);
+    sprintf_s(line, line_len, "%4d: %s", i + 1, h->line);
+    collector[i] = line;
+    longest = max(longest, strlen(h->line));
+  }
+
+  // Display the matches.
+  rl_display_match_list(collector, length - 1, longest);
+  rl_forced_update_display();
+
+  for (int i = 0; i < length; ++i) {
+    free(collector[i]);
+  }
+  return 0;
+}