1 files changed, 64 insertions, 0 deletions

diff --git a/examples/spinner.lua b/examples/spinner.lua
new file mode 100644
index 0000000..5526adc
--- /dev/null
+++ b/examples/spinner.lua
@@ -0,0 +1,64 @@
+local sys = require("system")
+
+print [[
+
+An example to display a spinner, whilst a long running task executes.
+
+]]
+
+
+-- start make backup, to auto-restore on exit
+sys.autotermrestore()
+-- configure console
+sys.setconsoleflags(io.stdin, sys.getconsoleflags(io.stdin) - sys.CIF_ECHO_INPUT - sys.CIF_LINE_INPUT)
+local of = sys.tcgetattr(io.stdin)
+sys.tcsetattr(io.stdin, sys.TCSANOW, { lflag = of.lflag - sys.L_ICANON - sys.L_ECHO })
+sys.setnonblock(io.stdin, true)
+
+
+
+local function hideCursor()
+  io.write("\27[?25l")
+  io.flush()
+end
+
+local function showCursor()
+  io.write("\27[?25h")
+  io.flush()
+end
+
+local function left(n)
+  io.write("\27[",n or 1,"D")
+  io.flush()
+end
+
+
+
+local spinner do
+  local spin = [[|/-\]]
+  local i = 1
+  spinner = function()
+    hideCursor()
+    io.write(spin:sub(i, i))
+    left()
+    i = i + 1
+    if i > #spin then i = 1 end
+
+    if sys.keypressed() then
+      sys.readkey() -- consume key pressed
+      io.write(" ");
+      left()
+      showCursor()
+      return true
+    else
+      return false
+    end
+  end
+end
+
+io.stdout:write("press any key to stop the spinner... ")
+while not spinner() do
+  sys.sleep(0.1)
+end
+
+print("Done!")