Re-enable progress bars when CLI output mode is explicitly human

[xbsheng]

Fixes part of #4860.

Problem

Output.set_mode() disables progress bars for any non-human mode but never re-enables them:

def set_mode(self, mode: OutputFormat = OutputFormat.auto) -> None:
    if mode == OutputFormat.auto:
        mode = OutputFormat.agent if is_agent() else OutputFormat.human
    self.mode = mode
    if mode != OutputFormat.human:
        disable_progress_bars()

In an agent-detected session (the current auto detection flags every Warp terminal, see #4860), the CLI starts with auto -> agent and progress bars are disabled. A later explicit hf ... --format human keeps them off: set_mode(human) only changes self.mode, it never calls enable_progress_bars().

Change

• src/huggingface_hub/cli/_output.py: set_mode(human) now calls enable_progress_bars().
• tests/test_cli_output.py: new test asserting set_mode(AGENT) disables and set_mode(HUMAN) re-enables the global progress-bar state.

This is independent of the auto-detection fix and works without any TTY sniffing.

---

Note

Low Risk
Small CLI output-mode change with no auth, data, or API impact; only affects global tqdm/progress-bar visibility.

Overview
Fixes progress bars staying off after switching the CLI to human output. Output.set_mode() already called disable_progress_bars() for non-human modes (agent, json, quiet) but did not turn them back on when mode became human—so a session that started in agent/auto could keep bars disabled even with hf ... --format human.

set_mode() now calls enable_progress_bars() when the resolved mode is human, mirroring the existing disable path. A new test checks agent → human toggles the global progress-bar flag and restores state in teardown.

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[cursor]

Human mode warns when bars disabled

Low Severity

set_mode now calls enable_progress_bars for every human-mode resolution, including Output construction and auto detection. That helper emits a UserWarning when HF_HUB_DISABLE_PROGRESS_BARS is set, so a normal hf command writes a warning to stderr even though bars were already intentionally disabled.

 

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[Wauplin]

closing in favor of #4878