iTerm2: open multiple sessions and run commands, allow many tabs and 2 to 4 panes splits in one tab

iterm2-python-open-multiple-sessions.py

#!/usr/bin/env python3.7

import iterm2

# Each top level item is new tab.
# Each second level item is new split pane session inside the tab.
windowsConfig = [
    # Max 4 sessions in one tab.
    ['echo 41', 'echo 42', 'echo 43', 'echo 44'],
    ['echo 31', 'echo 32', 'echo 33'],
    ['echo 21', 'echo 22'],
    ['echo 11']
]

async def buildTab(tab, splitsConfig):
    first_tab = tab.current_session
    sessions = [first_tab]
    if len(splitsConfig) == 4:
        bottom_left = await first_tab.async_split_pane(vertical=False)
        bottom_right = await bottom_left.async_split_pane(vertical=True)
        top_right = await first_tab.async_split_pane(vertical=True)
        sessions.append(top_right)
        sessions.append(bottom_left)
        sessions.append(bottom_right)
    elif len(splitsConfig) == 3:
        middle = await first_tab.async_split_pane(vertical=True)
        right = await middle.async_split_pane(vertical=True)
        sessions.append(middle)
        sessions.append(right)
    elif len(splitsConfig) == 2:
        right = await first_tab.async_split_pane(vertical=True)
        sessions.append(right)
    else:
        print("Only 4 tabs max supported")

    for i in range(len(sessions)):
        await sessions[i].async_send_text(splitsConfig[i] + '\n')
        

async def main(connection):
    app = await iterm2.async_get_app(connection)
    await iterm2.Window.async_create(connection)
    window = app.current_terminal_window
    if window is not None:
        for i in range(len(windowsConfig)):
            if i == 0:
                tab = window.current_tab
            else:
                tab = await window.async_create_tab()
            await buildTab(tab, windowsConfig[i])
    else:
        print("No current window")

iterm2.run_until_complete(main)