bsw@2: local old_draft_id = param.get("old_draft_id", atom.integer)
bsw@2: local new_draft_id = param.get("new_draft_id", atom.integer)
bsw@2: 
bsw@10: if not old_draft_id or not new_draft_id then
bsw@10:   slot.put( _"Please choose two versions of the draft to compare")
bsw@10:   return
bsw@10: end
bsw@10: 
bsw@10: if old_draft_id == new_draft_id then
bsw@10:   slot.put( _"Please choose two different versions of the draft to compare")
bsw@10:   return
bsw@10: end
bsw@10: 
bsw@2: if old_draft_id > new_draft_id then
bsw@2:   local tmp = old_draft_id
bsw@2:   old_draft_id = new_draft_id
bsw@2:   new_draft_id = tmp
bsw@2: end
bsw@2: 
bsw@2: local old_draft = Draft:by_id(old_draft_id)
bsw@2: local new_draft = Draft:by_id(new_draft_id)
bsw@2: 
poelzi@160: execute.view{
poelzi@160:   module = "draft",
poelzi@160:   view = "_head",
poelzi@160:   params = { draft = new_draft}
poelzi@160: }
poelzi@159: 
poelzi@160: slot.put_into("title", " · " .. _"Diff")
poelzi@159: 
poelzi@159: if app.session.member_id and not new_draft.initiative.revoked then
poelzi@159:   local supporter = Supporter:new_selector():add_where{"member_id = ?", app.session.member_id}:count()
poelzi@159:   if supporter then
poelzi@159:     ui.container{
poelzi@159:       attr = { class = "draft_updated_info" },
poelzi@159:       content = function()
poelzi@159:         slot.put(_"The draft of this initiative has been updated!")
poelzi@159:         slot.put(" ")
poelzi@159:         ui.link{
poelzi@159:           text   = _"Refresh support to current draft",
poelzi@159:           module = "initiative",
poelzi@159:           action = "add_support",
poelzi@159:           id     = new_draft.initiative.id,
poelzi@159:           routing = {
poelzi@159:             default = {
poelzi@159:               mode = "redirect",
poelzi@159:               module = "initiative",
poelzi@159:               view = "show",
poelzi@159:               id = new_draft.initiative.id
poelzi@159:             }
poelzi@159:           }
poelzi@159:         }
poelzi@159:       end
poelzi@159:     }
poelzi@159:   end
poelzi@159: end
poelzi@159: 
bsw@95: local old_draft_content = string.gsub(string.gsub(old_draft.content, "\n", " ###ENTER###\n"), " ", "\n")
bsw@95: local new_draft_content = string.gsub(string.gsub(new_draft.content, "\n", " ###ENTER###\n"), " ", "\n")
bsw@95: 
bsw@2: local key = multirand.string(26, "123456789bcdfghjklmnpqrstvwxyz");
bsw@2: 
bsw@2: local old_draft_filename = encode.file_path(request.get_app_basepath(), 'tmp', "diff-" .. key .. "-old.tmp")
bsw@2: local new_draft_filename = encode.file_path(request.get_app_basepath(), 'tmp', "diff-" .. key .. "-new.tmp")
bsw@2: 
bsw@2: local old_draft_file = assert(io.open(old_draft_filename, "w"))
bsw@95: old_draft_file:write(old_draft_content)
bsw@2: old_draft_file:write("\n")
bsw@2: old_draft_file:close()
bsw@2: 
bsw@2: local new_draft_file = assert(io.open(new_draft_filename, "w"))
bsw@95: new_draft_file:write(new_draft_content)
bsw@2: new_draft_file:write("\n")
bsw@2: new_draft_file:close()
bsw@2: 
bsw@95: local output, err, status = os.pfilter(nil, "sh", "-c", "diff -U 1000000000 '" .. old_draft_filename .. "' '" .. new_draft_filename .. "' | grep -v ^--- | grep -v ^+++ | grep -v ^@")
bsw@2: 
bsw@2: os.remove(old_draft_filename)
bsw@2: os.remove(new_draft_filename)
bsw@2: 
bsw@95: local last_state = "first_run"
bsw@95: 
bsw@95: local function process_line(line)
bsw@95:   local state_char = string.sub(line, 1, 1)
bsw@95:   local state
bsw@95:   if state_char == "+" then
bsw@95:     state = "added"
bsw@95:   elseif state_char == "-" then
bsw@95:     state = "removed"
bsw@95:   elseif state_char == " " then
bsw@95:     state = "unchanged"
bsw@95:   end
bsw@95:   local state_changed = false
bsw@95:   if state ~= last_state then
bsw@95:     if last_state ~= "first_run" then
bsw@95:       slot.put("</span> ")
bsw@95:     end
bsw@95:     last_state = state
bsw@95:     state_changed = true
bsw@95:     slot.put("<span class=\"diff_" .. tostring(state) .. "\">")
bsw@95:   end
bsw@95: 
bsw@95:   line = string.sub(line, 2, #line)
bsw@95:   if line ~= "###ENTER###" then
bsw@95:     if not state_changed then
bsw@95:       slot.put(" ")
bsw@95:     end
bsw@95:     slot.put(line)
bsw@95:   else
bsw@95:     slot.put("<br />")
bsw@95:   end
bsw@95: end
bsw@95: 
bsw@2: if not status then
bsw@2:   ui.field.text{ value = _"The drafts do not differ" }
bsw@2: else
bsw@95:   ui.container{
bsw@95:     tag = "div",
bsw@95:     attr = { class = "diff" },
bsw@95:     content = function()
bsw@95:       output = output:gsub("[^\n\r]+", function(line)
bsw@95:         process_line(line)
bsw@95:       end)
bsw@2:     end
bsw@95:   }
bsw@2: end 
bsw@2: