Displaying output that is re-written on the same lines

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#907 opened on Jan 25, 2023 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Stale
Tech stack: docker, docker-compose, python
Domain: cli, tooling

Research direction

No files or tests are named. Start by tracing how pyinvoke captures and prints subprocess output for the shown docker compose command, then compare its handling of carriage returns and other control characters with direct terminal output. Done means supported output is rendered with the same in-place updates without breaking existing command output behavior.

Written by the indexing model from the issue text.

Description

I'm trying to execute docker compose up -d --force-recreate --remove-orphans command via pyinvoke. The command outputs such that it updates on the same lines using control characters. But when executing via pyinvoke, it prints all the lines on separate lines.

Is it possible to have the output printed exactly as by the command?

Example:

docker-compose output (it does print logs for creating containers, but it is over-written by newer logs on the same line):

docker compose up -d --force-recreate --remove-orphans
[+] Running 3/3
 ⠿ Network test_app_default    Created                                                          0.1s
 ⠿ Container test_app-redis-1  Started                                                          1.3s
 ⠿ Container test_app-web-1    Started                                                          1.2s

same using pyinvoke:

docker compose up -d --force-recreate --remove-orphans
Network test_app_default  Creating
Network test_app_default  Created
Container test_app-redis-1  Creating
Container test_app-web-1  Creating
Container test_app-redis-1  Created
Container test_app-web-1  Created
Container test_app-redis-1  Starting
Container test_app-web-1  Starting
Container test_app-web-1  Started
Container test_app-redis-1  Started

Of course I could add the --no-ansi flag to docker-compose, but I was wondering if we can achieve this effect via pyinvoke as well.

Thanks!

Dominant language: Python
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