add some cursor ops for tty

2 files changed, 42 insertions, 4 deletions

diff --git a/xmake/core/base/tty.lua b/xmake/core/base/tty.lua
index d1245fc1a..7ad78ab3e 100644
--- a/xmake/core/base/tty.lua
+++ b/xmake/core/base/tty.lua
@@ -56,6 +56,48 @@ function tty.erase_line()
     return tty
 end
 
+-- erases the screen from the current line down to the bottom of the screen.
+function tty.erase_down()
+    tty._iowrite("\x1b[J")
+    return tty
+end
+
+-- erases the screen from the current line up to the top of the screen.
+function tty.erase_up()
+    tty._iowrite("\x1b[1J")
+    return tty
+end
+
+-- erases the screen with the background colour and moves the cursor to home.
+function tty.erase_screen()
+    tty._iowrite("\x1b[2J")
+    return tty
+end
+
+-- save current cursor position.
+function tty.cursor_save()
+    tty._iowrite("\x1b[s")
+    return tty
+end
+
+-- restores cursor position after a save cursor.
+function tty.cursor_restore()
+    tty._iowrite("\x1b[u")
+    return tty
+end
+
+-- save current cursor position and color attrs
+function tty.cursor_and_attrs_save()
+    tty._iowrite("\x1b7")
+    return tty
+end
+
+-- restores cursor position and color attrs after a save cursor.
+function tty.cursor_and_attrs_restore()
+    tty._iowrite("\x1b8")
+    return tty
+end
+
 -- carriage return
 function tty.cr()
     tty._iowrite("\r")
diff --git a/xmake/core/sandbox/modules/utils.lua b/xmake/core/sandbox/modules/utils.lua
index 8492b1302..4dac4a91e 100644
--- a/xmake/core/sandbox/modules/utils.lua
+++ b/xmake/core/sandbox/modules/utils.lua
@@ -174,8 +174,6 @@ end
 
 -- assert
 function sandbox_utils.assert(value, format, ...)
-
-    -- check
     if not value then
         if format ~= nil then
             os.raiselevel(2, format, ...)
@@ -183,8 +181,6 @@ function sandbox_utils.assert(value, format, ...)
             os.raiselevel(2, "assertion failed!")
         end
     end
-
-    -- return it
     return value
 end