todos and fix unindent

fixed behaviour where caret would move even when the un-indentation did not
do anything, now before modifying caret position check wether the file changed

TODO

@@ -16,12 +16,18 @@
 [ ] console: accept input
 [ ] doc: detect file changes with hash
 [ ] add a cross to close tab
+[ ] add context menu to various things
+	[ ] document and selection context menu
+	[ ] treeview context menu
+	[ ] tab context menu for close duplicate etc
 [ ] prevent overscrolling on treeview
 [x] user config file and/or init.lua
 [x] change tmp directory to somewhere in /tmp
 [x] save project directory and restore on reopening
 [ ] optimize dir tree taking too long to load on big folders
 [ ] SDL: optimize drawing operations
+	[ ] implement render queue for each frame and render in batch, this
+	    should save some time and improve cache locality
 [ ] syntax: do not reload syntax on every draw event
 [ ] go in background when launching from terminal
 [ ] some key bindings:
@@ -37,8 +43,8 @@
 	[x] ctrl+n -> next_find
 	[x] ctrl+shift+n -> prev_find
 	[x] f3 -> new file
-	[ ] selected + tab == indent up
-	[ ] selected +shift+tab == indent down
+	[x] selected + tab == indent up
+	[x] selected +shift+tab == indent down
 [x] change alt+<number> to ctrl+<number>
 [ ] add multi cursor system
 [ ] add binding to open up a cheatsheet of keybinding, with a

data/core/commands/doc.lua

@@ -38,6 +38,7 @@ end
 
 local function remove_from_start_of_selected_lines(text, skip_empty)
   local line1, col1, line2, col2, swap = doc():get_selection(true)
+  local stat_before = doc():get_change_id()
   for line = line1, line2 do
     local line_text = doc().lines[line]
     if  line_text:sub(1, #text) == text
@@ -46,7 +47,9 @@ local function remove_from_start_of_selected_lines(text, skip_empty)
       doc():remove(line, 1, line, #text + 1)
     end
   end
-  doc():set_selection(line1, col1 - #text, line2, col2 - #text, swap)
+  if doc():get_change_id() ~= stat_before then
+    doc():set_selection(line1, col1 - #text, line2, col2 - #text, swap)
+  end
 end
 
 
@@ -181,7 +184,7 @@ local commands = {
 
   ["doc:unindent"] = function()
     local text = get_indent_string()
-    remove_from_start_of_selected_lines(text)
+    remove_from_start_of_selected_lines(text, true)
   end,
 
   ["doc:duplicate-lines"] = function()

data/core/doc/init.lua

@@ -65,6 +65,8 @@ function Doc:reset_syntax()
 end
 
 
+-- TODO: implement a new table containing hashes, re-hash at every consistent
+--       change and use the hash difference as check for dirty
 function Doc:load(filename)
   local fp = assert( io.open(filename, "rb") )
   self:reset()