Added in a hash check to the system clipboard.

data/core/commands/doc.lua

@@ -53,6 +53,18 @@ local function save(filename)
   core.log("Saved \"%s\"", saved_filename)
 end
 
+
+local function split_cursor(direction)
+  local new_cursors = {}
+  for _, line1, col1 in doc():get_selections() do
+    if line1 > 1 and line1 < #doc().lines then
+      table.insert(new_cursors, { line1 + direction, col1 })
+    end
+  end
+  for i,v in ipairs(new_cursors) do doc():add_selection(v[1], v[2]) end
+  core.blink_reset()
+end
+
 local function cut_or_copy(delete)
   local full_text = ""
   for idx, line1, col1, line2, col2 in doc():get_selections() do
@@ -67,18 +79,10 @@ local function cut_or_copy(delete)
       doc().cursor_clipboard[idx] = ""
     end
   end
-  system.set_clipboard(full_text)
-end
-
-local function split_cursor(direction)
-  local new_cursors = {}
-  for _, line1, col1 in doc():get_selections() do
-    if line1 > 1 and line1 < #doc().lines then
-      table.insert(new_cursors, { line1 + direction, col1 })
-    end
+  if #doc().cursor_clipboard > 1 then 
+    doc().cursor_clipboard["hash"] = system.hash(system.get_clipboard())
   end
-  for i,v in ipairs(new_cursors) do doc():add_selection(v[1], v[2]) end
-  core.blink_reset()
+  system.set_clipboard(full_text)
 end
 
 local commands = {
@@ -99,8 +103,13 @@ local commands = {
   end,
 
   ["doc:paste"] = function()
+    local clipboard = system.get_clipboard()
+    -- If the clipboard has changed since our last look, use that instead
+    if doc().cursor_clipboard["hash"] ~= system.hash(clipboard) then
+      doc().cursor_clipboard = {}
+    end
     for idx, line1, col1, line2, col2 in doc():get_selections() do
-      local value = doc().cursor_clipboard[idx] or system.get_clipboard()
+      local value = doc().cursor_clipboard[idx] or clipboard
       doc():text_input(value:gsub("\r", ""), idx)
     end
   end,

data/core/doc/init.lua

@@ -173,6 +173,7 @@ function Doc:merge_cursors(idx)
       if self.selections[i] == self.selections[j] and
         self.selections[i+1] == self.selections[j+1] then
           common.splice(self.selections, i, 4)
+          common.splice(self.cursor_clipboard, i, 1)
           break
       end
     end

src/api/system.c

@@ -637,6 +637,14 @@ static int f_set_window_opacity(lua_State *L) {
   return 1;
 }
 
+static int f_hash(lua_State* L) {
+  unsigned i = RENCACHE_HASH_INITIAL;
+  size_t strLen;
+  const char *str = luaL_checklstring(L, 1, &strLen);
+  rencache_hash(&i, str, strLen) ;
+  lua_pushnumber(L, i);
+  return 1;
+}
 
 static const luaL_Reg lib[] = {
   { "poll_event",          f_poll_event          },
@@ -664,6 +672,7 @@ static const luaL_Reg lib[] = {
   { "exec",                f_exec                },
   { "fuzzy_match",         f_fuzzy_match         },
   { "set_window_opacity",  f_set_window_opacity  },
+  { "hash",                f_hash                },
   { NULL, NULL }
 };
 

src/rencache.c

@@ -83,10 +83,7 @@ static void font_refs_clear(lua_State *L) {
   font_refs_len = 0;
 }
 
-/* 32bit fnv-1a hash */
-#define HASH_INITIAL 2166136261
-
-static void hash(unsigned *h, const void *data, int size) {
+void rencache_hash(unsigned *h, const void *data, int size) {
   const unsigned char *p = data;
   while (size--) {
     *h = (*h ^ *p++) * 16777619;
@@ -227,7 +224,7 @@ static void update_overlapping_cells(RenRect r, unsigned h) {
   for (int y = y1; y <= y2; y++) {
     for (int x = x1; x <= x2; x++) {
       int idx = cell_idx(x, y);
-      hash(&cells[idx], &h, sizeof(h));
+      rencache_hash(&cells[idx], &h, sizeof(h));
     }
   }
 }
@@ -255,8 +252,8 @@ void rencache_end_frame(lua_State *L) {
     if (cmd->type == SET_CLIP) { cr = cmd->rect; }
     RenRect r = intersect_rects(cmd->rect, cr);
     if (r.width == 0 || r.height == 0) { continue; }
-    unsigned h = HASH_INITIAL;
-    hash(&h, cmd, cmd->size);
+    unsigned h = RENCACHE_HASH_INITIAL;
+    rencache_hash(&h, cmd, cmd->size);
     update_overlapping_cells(r, h);
   }
 
@@ -271,7 +268,7 @@ void rencache_end_frame(lua_State *L) {
       if (cells[idx] != cells_prev[idx]) {
         push_rect((RenRect) { x, y, 1, 1 }, &rect_count);
       }
-      cells_prev[idx] = HASH_INITIAL;
+      cells_prev[idx] = RENCACHE_HASH_INITIAL;
     }
   }
 

src/rencache.h

@@ -5,8 +5,12 @@
 #include <lua.h>
 #include "renderer.h"
 
+/* 32bit fnv-1a hash */
+#define RENCACHE_HASH_INITIAL 2166136261
+
 void rencache_show_debug(bool enable);
 void rencache_set_clip_rect(RenRect rect);
+void rencache_hash(unsigned *h, const void *data, int size);
 void rencache_draw_rect(RenRect rect, RenColor color);
 int  rencache_draw_text(lua_State *L, FontDesc *font_desc, int font_index, const char *text, int x, int y, RenColor color,
   bool draw_subpixel, CPReplaceTable *replacements, RenColor replace_color);