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import("core.base.tty")
-- Demo TTY cursor position control features
-- Implement partial screen refresh
function _progress_bar_inline(label, progress)
local bar_width = 40
local filled = math.floor(progress * bar_width)
local bar = string.rep("█", filled) .. string.rep("░", bar_width - filled)
-- Clear the line and output content
tty.cr()
tty.erase_line()
io.write(string.format("%s: [%s] %3d%%", label, bar, math.floor(progress * 100)))
io.flush()
end
function main()
-- Check if ANSI control codes are supported
if not tty.has_vtansi() then
print("Terminal does not support ANSI control codes")
return
end
print("=== TTY Cursor Control Demo ===")
print("This demo shows partial screen refresh using cursor positioning")
print("")
-- Hide cursor for smoother display
tty.cursor_hide()
print("\nDemo 1: Multiple Progress Bars (Parallel Updates)")
print("------------------------------------------------")
-- Reserve lines for progress bars
io.write("Task 1: Downloading\n")
io.write("Task 2: Compiling \n")
io.write("Task 3: Linking \n")
io.flush()
-- Simulate three parallel task progress bars
for step = 1, 100 do
-- Move to Task 1 line (3 lines up from current position)
tty.cursor_move_up(3)
-- Update Task 1 progress
local progress1 = step / 100
_progress_bar_inline("Task 1: Downloading", progress1)
io.write("\n")
-- Update Task 2 progress (starts later, progresses faster)
local progress2 = math.max(0, math.min(1.0, (step - 10) / 80))
_progress_bar_inline("Task 2: Compiling ", progress2)
io.write("\n")
-- Update Task 3 progress (starts even later)
local progress3 = math.max(0, math.min(1.0, (step - 30) / 60))
_progress_bar_inline("Task 3: Linking ", progress3)
io.write("\n")
io.flush()
os.sleep(30) -- 30ms delay
end
print("\n\nDemo 2: Dynamic Status Updates")
print("--------------------------------")
-- Print initial status and counter
io.write("Status: Waiting...\n")
io.write("Counter: 0\n")
io.flush()
local statuses = {
"Initializing...",
"Loading configuration...",
"Parsing files...",
"Building dependencies...",
"Compiling sources...",
"Linking executable...",
"Done!"
}
for i, status in ipairs(statuses) do
-- Move to status line (2 lines up)
tty.cursor_move_up(2)
-- Update status line
tty.cr()
tty.erase_line()
io.write(string.format("Status: %s", status))
io.write("\n")
-- Update counter line
tty.cr()
tty.erase_line()
io.write(string.format("Counter: %d", i * 100))
io.write("\n")
io.flush()
os.sleep(500)
end
-- Restore cursor visibility
tty.cursor_show()
print("\n\nDemo 3: Erase and Update Specific Line")
print("----------------------------------------")
io.write("Line 1: This line will stay\n")
io.write("Line 2: This line will be updated...\n")
io.write("Line 3: This line will stay too\n")
io.flush()
os.sleep(1000)
-- Update only the middle line (2 lines up)
tty.cursor_move_up(2)
tty.cr()
tty.erase_line()
io.write("Line 2: Updated content! ✓\n")
io.flush()
-- Move cursor to end
tty.cursor_move_down(1)
print("\n\nAll demos completed!")
print("\nKey features demonstrated:")
print(" - cursor_move_up/down/left/right: Move cursor relatively")
print(" - cursor_save/restore: Save and restore cursor position")
print(" - erase_line(): Clear current line")
print(" - cursor_hide()/cursor_show(): Control cursor visibility")
print(" - Partial screen refresh without clearing entire screen")
end
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