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8a9b89deda
This PR adds a standalone `fabro provider login --provider <name>`
command so users can re-authenticate with LLM providers outside of the
initial `fabro install` wizard—useful when tokens expire or when
switching accounts. For OpenAI, it offers the browser-based OAuth PKCE
flow with an automatic fallback to manual API key entry; all other
providers go straight to an API key prompt with validation. Credentials
are merged non-destructively into `~/.fabro/.env`.
To support this, shared authentication helpers (`provider_key_url`,
`provider_display_name`, `openai_oauth_env_pairs`, `write_env_file`,
`validate_api_key`, `prompt_and_validate_key`, and the underlying prompt
functions) are extracted from `install.rs` into a new `provider_auth.rs`
module. The install flow is updated to import from the shared module and
delegate the OpenAI OAuth-or-fallback logic to a single
`run_openai_oauth_or_api_key` helper, eliminating duplication between
the two code paths.
The new command is wired into the CLI via a `ProviderCommand::Login`
subcommand under `Command::Provider`, with clap-level parsing tests
covering valid providers, missing flags, and unknown provider names.
### Fabro Details
<details>
<summary>Ran 10 stages in 26m 57s for $7.49</summary>
| Stage | Duration | Cost | Retries |
|---|---|---|---|
| start | 0s | – | 0 |
| toolchain | 0s | – | 0 |
| preflight_compile | 1m 11s | – | 0 |
| preflight_lint | 13s | – | 0 |
| implement | 9m 16s | $2.76 | 0 |
| simplify_opus | 6m 32s | $2.05 | 0 |
| simplify_gemini | 4m 44s | $1.58 | 0 |
| simplify_gpt | 4m 2s | $1.10 | 0 |
| verify | 22s | – | 0 |
| fmt | 1s | – | 0 |
| **Total** | **26m 57s** | **$7.49** | **0** |
</details>
<details>
<summary>Ran <code>ImplementAndSimplify.fabro</code> (13 nodes and 16
edges)</summary>
```dot
digraph ImplementAndSimplify {
graph [
goal="Implement and simplify",
model_stylesheet="
* { backend: api; model: claude-opus-4-6;}
"
]
rankdir=LR
start [shape=Mdiamond, label="Start"]
exit [shape=Msquare, label="Exit"]
toolchain [label="Toolchain", shape=parallelogram, script="command -v cargo >/dev/null || { curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y && sudo ln -sf $HOME/.cargo/bin/* /usr/local/bin/; }; cargo --version 2>&1", max_retries=0]
preflight_compile [label="Preflight Compile", shape=parallelogram, script="cargo check -q --workspace 2>&1", max_retries=0]
preflight_lint [label="Preflight Lint", shape=parallelogram, script="cargo clippy -q --workspace -- -D warnings 2>&1", max_retries=0]
fix_lints [label="Fix Lints", prompt="The preflight lint step failed. Read the build output from context and fix all clippy lint warnings.", max_visits=3]
implement [label="Implement", prompt="Read the plan file referenced in the goal and implement every step. Make all the code changes described in the plan. Use red/green TDD."]
simplify_opus [label="Simplify (Opus)", prompt="@prompts/simplify.md"]
simplify_gemini [label="Simplify (Gemini)", prompt="@prompts/simplify.md", model="gemini-3.1-pro-preview-customtools"]
simplify_gpt [label="Simplify (GPT-54)", prompt="@prompts/simplify.md", model="gpt-54"]
verify [label="Verify", shape=parallelogram, script="cargo clippy -q --workspace -- -D warnings 2>&1 && cargo nextest run --cargo-quiet --workspace --status-level fail 2>&1", goal_gate=true, retry_target="fixup"]
fixup [label="Fixup", prompt="The verify step failed. Read the build output from context and fix all clippy lint warnings and test failures.", max_visits=3]
fmt [label="Format", shape=parallelogram, script="cargo fmt --all 2>&1", max_retries=0]
start -> toolchain
toolchain -> preflight_compile [condition="outcome=success"]
toolchain -> exit
preflight_compile -> preflight_lint [condition="outcome=success"]
preflight_compile -> exit
preflight_lint -> implement [condition="outcome=success"]
preflight_lint -> fix_lints
fix_lints -> preflight_lint
implement -> simplify_opus -> simplify_gemini -> simplify_gpt -> verify
verify -> fmt [condition="outcome=success"]
verify -> fixup
fixup -> verify
fmt -> exit
}
```
</details>
⚒️ Generated with [Fabro](https://fabro.sh)
---------
Co-authored-by: Fabro <noreply@fabro.sh>
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| crates | ||
| packages/fabro-api-client | ||