Fix directories management to always keep the project's directory

data/core/commands/core.lua

@@ -185,12 +185,12 @@ command.add(nil, {
   ["core:remove-directory"] = function()
     local dir_list = {}
     local n = #core.project_directories
-    for i = n, 1, -1 do
+    for i = n, 2, -1 do
       dir_list[n - i + 1] = core.project_directories[i].name
     end
     core.command_view:enter("Remove Directory", function(text)
       if not core.remove_project_directory(text) then
-        core.error("The project has no directory %q", text)
+        core.error("No added directory %q to be removed", text)
       end
     end, function(text)
       text = common.home_expand(text)

data/core/init.lua

@@ -11,8 +11,6 @@ local Doc
 
 local core = {}
 
-core.project_files_empty = {}
-
 local function load_session()
   local ok, t = pcall(dofile, USERDIR .. "/session.lua")
   if ok then
@@ -65,11 +63,7 @@ function core.set_project_dir(new_dir)
   system.chdir(new_dir)
   core.project_directories = {}
   core.add_project_directory(new_dir)
-  -- core.project_files will be set during the project files scan
-  -- to point to the files of the project directory.
-  -- core.project_files will therefore not include any of the added
-  -- directories.
-  core.project_files = core.project_files_empty
+  core.project_files = {}
   core.reschedule_project_scan()
 end
 
@@ -153,7 +147,6 @@ local function project_scan_thread()
   while true do
     -- get project files and replace previous table if the new table is
     -- different
-    local include_project_dir = false
     for i = 1, #core.project_directories do
       local dir = core.project_directories[i]
       local t, entries_count = get_files(dir.name, "")
@@ -167,13 +160,9 @@ local function project_scan_thread()
         core.redraw = true
       end
       if dir.name == core.project_dir then
-        include_project_dir = true
         core.project_files = dir.files
       end
     end
-    if not include_project_dir then
-      core.project_files = core.project_files_empty
-    end
 
     -- wait for next scan
     coroutine.yield(config.project_scan_rate)
@@ -310,7 +299,9 @@ end
 
 
 function core.remove_project_directory(path)
-  for i, dir in ipairs(core.project_directories) do
+  -- skip the fist directory because it is the project's directory
+  for i = 2, #core.project_directories do
+    local dir = core.project_directories[i]
     if dir.name == path then
       table.remove(core.project_directories, i)
       return true