Backtracking to previous placeholders/tab stops is available in snipp…

…ets.lua

git-svn-id: http://scite-tools.googlecode.com/svn/trunk@195 b6d8bf09-a419-0410-8828-31a925e9f9d7

scripts/scite/key_commands.lua

@@ -71,9 +71,9 @@ keys['ca0'] = { 1119 }
 -- snippets
 local m_snippets = modules.scite.snippets
 keys.ci   = { m_snippets.insert           }
-keys.csi  = { m_snippets.cancel_current   }
-keys.cai  = { m_snippets.list             }
-keys.csai = { m_snippets.insert_temporary }
+keys.csi  = { m_snippets.prev             }
+keys.cai  = { m_snippets.cancel_current   }
+keys.csai = { m_snippets.list             }
 keys.ai   = { m_snippets.show_scope       }
 -- keys.? = { 1120 }, -- create snippets
 

scripts/scite/snippets.lua

@@ -142,6 +142,7 @@ function insert(snippet_arg)
     if snippet.index then table.insert(snippet_stack, snippet) end
 
     snippet = {}
+    snippet.snapshots = {}
     snippet.index     = 0
     snippet.start_pos = editor.CurrentPos
     snippet.cursor    = nil
@@ -195,6 +196,7 @@ next_snippet_item = function()
   -- If something went wrong and the snippet has been 'messed' up
   -- (e.g. by undo/redo commands).
   if not s_text then cancel_current() return end
+  snippet.snapshots[snippet.index] = s_text
 
   -- Mirror and transform.
   editor:BeginUndoAction()
@@ -327,6 +329,21 @@ next_snippet_item = function()
   editor:EndUndoAction()
 end
 
+---
+-- Goes back to the previous placeholder or tab stop, reverting changes made to
+-- subsequent ones.
+function prev()
+  if not snippet.index then return end
+  local index = snippet.index
+  if index > 1 then
+    local s_start, s_end = snippet_text()
+    local s_text = snippet.snapshots[index - 2]
+    editor:SetSel(s_start, s_end) editor:ReplaceSel(s_text)
+    snippet.index = index - 2
+    next_snippet_item()
+  end
+end
+
 ---
 -- Cancels active snippet, reverting to the state before the snippet was
 -- activated.