omni_dev/cli/

gmail.rs

//! Gmail CLI commands.

pub(crate) mod account;
pub(crate) mod auth;
pub(crate) mod draft;
pub(crate) mod extract_attachments;
pub(crate) mod format;
pub(crate) mod helpers;
pub(crate) mod insert;
pub(crate) mod label;
pub(crate) mod read;
pub(crate) mod render;
pub(crate) mod search;
pub(crate) mod selection;
pub(crate) mod sync;
pub(crate) mod sync_all;
pub(crate) mod thread;

use anyhow::Result;
use clap::{Parser, Subcommand};

use crate::gmail::account::GMAIL_ACCOUNT_ENV;
use crate::gmail::client::GmailClient;

/// Gmail: read Gmail messages, threads, and labels (and, with `gmail.modify`,
/// change labels, drafts and restored messages).
#[derive(Parser)]
pub struct GmailCommand {
    /// Selects a named Gmail account configured in
    /// `~/.omni-dev/settings.json` (AWS-CLI style, mirrors the top-level
    /// `--profile`) for this invocation.
    ///
    /// Orthogonal to `--profile`: switching the Gmail account never changes
    /// which profile is active, and vice versa (see
    /// [ADR-0066](../../../docs/adrs/adr-0066.md)). Overrides
    /// `OMNI_DEV_GMAIL_ACCOUNT`. Scoped to the `gmail` subtree — unlike
    /// `--profile`/`--instance` it is not usable before the `gmail`
    /// subcommand name, only after it (`gmail --account NAME <cmd>` or
    /// `gmail <cmd> --account NAME`), so it can't collide with an unrelated
    /// subcommand's own `--account` flag elsewhere in the CLI (e.g.
    /// `snowflake query --account`).
    #[arg(long, global = true, value_name = "NAME")]
    pub account: Option<String>,
    /// The Gmail subcommand to execute.
    #[command(subcommand)]
    pub command: GmailSubcommands,
}

/// Gmail subcommands.
#[derive(Subcommand)]
pub enum GmailSubcommands {
    /// Manages Gmail OAuth2 credentials (mirrors the `gmail_auth_status` MCP tool for `status`).
    Auth(auth::AuthCommand),
    /// Manages named Gmail accounts (mirrors the `gmail_account_list` MCP tool for `list`).
    Account(account::AccountCommand),
    /// Searches Gmail messages (mirrors the `gmail_search` MCP tool).
    Search(search::SearchCommand),
    /// Reads a single Gmail message (mirrors the `gmail_message_read` MCP tool).
    Read(read::ReadCommand),
    /// Reads a Gmail thread (mirrors the `gmail_thread_read` MCP tool).
    Thread(thread::ThreadCommand),
    /// Manages Gmail labels (mirrors the `gmail_label_list` MCP tool; `add`/`remove` are CLI-only in Phase 1).
    Label(label::LabelCommand),
    /// Manages Gmail drafts; never sends or deletes one (mirrors the
    /// `gmail_draft_list`/`gmail_draft_show` MCP tools for `list`/`show`;
    /// `create`/`update` are CLI-only; #1920).
    Draft(draft::DraftCommand),
    /// Maintains a durable local archive of a mailbox (CLI-only; no MCP equivalent).
    Sync(sync::SyncCommand),
    /// Maintains durable local archives for every account in
    /// `.omni-dev/gmail-sync.yaml`, concurrently (CLI-only; no MCP
    /// equivalent; ADR-0068).
    SyncAll(sync_all::SyncAllCommand),
    /// Retroactively extracts attachments for already-archived messages,
    /// without re-fetching from Gmail (CLI-only; no MCP equivalent; purely
    /// local, no client/credentials needed; #1510).
    ExtractAttachments(extract_attachments::ExtractAttachmentsCommand),
    /// Renders one or more archived `.eml` files as human-readable Markdown
    /// (CLI-only; no MCP equivalent; purely local, no client/credentials
    /// needed; #1513).
    Render(render::RenderCommand),
    /// Restores archived `.eml` messages into a mailbox (needs
    /// `gmail.modify`; CLI-only; no MCP equivalent; #1655).
    Insert(insert::InsertCommand),
}

impl GmailCommand {
    /// Executes the Gmail command.
    ///
    /// `auth` manages credentials and must run without them; `account`
    /// manages which named account is selected and must equally run
    /// without a resolved client (`import-legacy`'s whole point is working
    /// in a pre-migration state). `sync-all` also runs without the shared
    /// client: it resolves one client per configured account itself
    /// (`helpers::create_client_for`, never the env var below, which is
    /// unsafe across its concurrent tasks — ADR-0068). `extract-attachments`
    /// also runs without a client — it never contacts Gmail at all, only
    /// the local archive under `--archive-dir`, so `--account` has no
    /// meaning for it either (#1510). Every other subcommand needs an
    /// authenticated client, which is resolved **once** here and threaded
    /// down so each leaf takes `&GmailClient` and stays free of process
    /// env. `render` also runs without a client — like
    /// `extract-attachments`, it only ever reads `.eml` files already on
    /// disk (#1513).
    pub async fn execute(self) -> Result<()> {
        let account = self.account;
        match self.command {
            GmailSubcommands::SyncAll(cmd) => {
                anyhow::ensure!(
                    account.is_none(),
                    "--account is not compatible with sync-all; configure accounts in \
                     .omni-dev/gmail-sync.yaml instead"
                );
                cmd.execute().await
            }
            GmailSubcommands::ExtractAttachments(cmd) => {
                anyhow::ensure!(
                    account.is_none(),
                    "--account is not compatible with extract-attachments; it operates on a \
                     local archive directory only"
                );
                cmd.execute()
            }
            GmailSubcommands::Render(cmd) => {
                anyhow::ensure!(
                    account.is_none(),
                    "--account is not compatible with render; it operates on local .eml files \
                     only"
                );
                cmd.execute()
            }
            command => {
                // Propagates --account to the env var for the duration of
                // this call only (`gmail::account::resolve_account` reads
                // it, issue #1500), mirroring `Cli::propagate_profile_flag`'s
                // pattern: only set when present, so an existing ambient
                // OMNI_DEV_GMAIL_ACCOUNT still works when the flag is
                // omitted. The guard restores/removes it on drop at the end
                // of this scope, so execute() is safe to call more than once
                // per process (#1538).
                let _account_guard = account.as_ref().map(|account| {
                    crate::utils::env::ScopedEnvVar::set(GMAIL_ACCOUNT_ENV, account)
                });

                match command {
                    GmailSubcommands::Auth(cmd) => cmd.execute().await,
                    GmailSubcommands::Account(cmd) => cmd.execute(),
                    data => {
                        let client = helpers::create_client()?;
                        data.dispatch(&client).await
                    }
                }
            }
        }
    }
}

impl GmailSubcommands {
    /// Routes a non-`Auth`/`Account`/`SyncAll`/`ExtractAttachments`/`Render`
    /// subcommand against the shared client. Kept separate from credential
    /// resolution so it is testable without env (tests pass a client
    /// pointed at an unreachable URL). Those five arms are unreachable
    /// because all five are handled before client resolution in
    /// [`GmailCommand::execute`] — `SyncAll` builds its own per-account
    /// clients instead of using the shared one (ADR-0068), and
    /// `ExtractAttachments`/`Render` need no client at all (#1510, #1513).
    async fn dispatch(self, client: &GmailClient) -> Result<()> {
        match self {
            Self::Auth(_) => {
                unreachable!("Auth is dispatched before client resolution")
            }
            Self::Account(_) => {
                unreachable!("Account is dispatched before client resolution")
            }
            Self::SyncAll(_) => {
                unreachable!("SyncAll is dispatched before client resolution")
            }
            Self::ExtractAttachments(_) => {
                unreachable!("ExtractAttachments is dispatched before client resolution")
            }
            Self::Render(_) => {
                unreachable!("Render is dispatched before client resolution")
            }
            Self::Search(cmd) => cmd.execute(client).await,
            Self::Read(cmd) => cmd.execute(client).await,
            Self::Thread(cmd) => cmd.execute(client).await,
            Self::Label(cmd) => cmd.execute(client).await,
            Self::Draft(cmd) => cmd.execute(client).await,
            Self::Sync(cmd) => cmd.execute(client).await,
            Self::Insert(cmd) => cmd.execute(client).await,
        }
    }
}

#[cfg(test)]
#[allow(clippy::unwrap_used)]
mod tests {
    use super::*;
    use crate::cli::gmail::format::OutputFormat;
    use crate::cli::gmail::selection::SelectionArgs;
    use crate::gmail::auth::{GmailCredentials, GmailScope};
    use crate::gmail::client::GmailClient;
    use crate::utils::secret::Secret;

    fn dead_credentials() -> GmailCredentials {
        GmailCredentials {
            client_id: "client".to_string(),
            client_secret: Secret::new("secret"),
            refresh_token: Secret::new("refresh"),
            scope: GmailScope::ReadOnly,
        }
    }

    /// A client pointed at an unreachable URL. Routing tests use it so a
    /// command runs through dispatch -> leaf -> the HTTP layer and fails
    /// with a connection error — exercising the routing without touching
    /// credentials, the process environment, or a mock server.
    fn dead_client() -> GmailClient {
        GmailClient::new("http://127.0.0.1:1", &dead_credentials()).unwrap()
    }

    // ── GmailCommand::execute glue ──────────────────────────────────
    //
    // The success path (`helpers::create_client()` succeeding, then
    // `data.dispatch(&client)` actually issuing a request) needs real
    // credentials and would hit the real Gmail API host — there's no
    // env-var override to redirect it at a mock server (see the
    // `mcp::gmail_tools` module doc). These tests cover the
    // credentials-missing error path, which is deterministic and
    // network-free.

    #[tokio::test]
    async fn execute_routes_auth_subcommand_and_surfaces_missing_credentials() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Auth(auth::AuthCommand {
                command: auth::AuthSubcommands::Status(auth::StatusCommand { all: false }),
            }),
        };
        let err = cmd.execute().await.unwrap_err();
        assert!(err.to_string().contains("not configured"));
    }

    #[tokio::test]
    async fn execute_non_auth_subcommand_errors_when_credentials_missing() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Search(search::SearchCommand {
                query: "label:finance".to_string(),
                limit: 10,
                enrich: false,
                concurrency: 4,
                output: OutputFormat::Table,
            }),
        };
        let err = cmd.execute().await.unwrap_err();
        assert!(err.to_string().contains("not configured"));
    }

    #[test]
    fn gmail_subcommands_auth_variant() {
        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Auth(auth::AuthCommand {
                command: auth::AuthSubcommands::Status(auth::StatusCommand { all: false }),
            }),
        };
        assert!(matches!(cmd.command, GmailSubcommands::Auth(_)));
    }

    #[test]
    fn gmail_subcommands_account_variant() {
        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Account(account::AccountCommand {
                command: account::AccountSubcommands::List(account::list::ListCommand {
                    output: OutputFormat::Table,
                }),
            }),
        };
        assert!(matches!(cmd.command, GmailSubcommands::Account(_)));
    }

    #[tokio::test]
    async fn execute_restores_account_env_var_after_return() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();

        let cmd = GmailCommand {
            account: Some("work".to_string()),
            command: GmailSubcommands::Account(account::AccountCommand {
                command: account::AccountSubcommands::List(account::list::ListCommand {
                    output: OutputFormat::Table,
                }),
            }),
        };
        cmd.execute().await.unwrap();
        assert_eq!(std::env::var(GMAIL_ACCOUNT_ENV).ok(), None);
    }

    #[tokio::test]
    async fn execute_restores_previous_account_env_var_after_return() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        std::env::set_var(GMAIL_ACCOUNT_ENV, "personal");

        let cmd = GmailCommand {
            account: Some("work".to_string()),
            command: GmailSubcommands::Account(account::AccountCommand {
                command: account::AccountSubcommands::List(account::list::ListCommand {
                    output: OutputFormat::Table,
                }),
            }),
        };
        cmd.execute().await.unwrap();
        assert_eq!(
            std::env::var(GMAIL_ACCOUNT_ENV).ok().as_deref(),
            Some("personal")
        );
    }

    #[tokio::test]
    async fn execute_does_not_leak_account_across_sequential_calls() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();

        let account_list_cmd = || GmailCommand {
            account: None,
            command: GmailSubcommands::Account(account::AccountCommand {
                command: account::AccountSubcommands::List(account::list::ListCommand {
                    output: OutputFormat::Table,
                }),
            }),
        };

        let first = GmailCommand {
            account: Some("alpha".to_string()),
            ..account_list_cmd()
        };
        first.execute().await.unwrap();
        assert_eq!(std::env::var(GMAIL_ACCOUNT_ENV).ok(), None);

        // If the first call's value had leaked, this second call — which
        // omits --account entirely — would still see it via the env var.
        account_list_cmd().execute().await.unwrap();
        assert_eq!(std::env::var(GMAIL_ACCOUNT_ENV).ok(), None);
    }

    #[tokio::test]
    async fn execute_absent_account_leaves_ambient_env_var_untouched() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        std::env::set_var(GMAIL_ACCOUNT_ENV, "personal");

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Account(account::AccountCommand {
                command: account::AccountSubcommands::List(account::list::ListCommand {
                    output: OutputFormat::Table,
                }),
            }),
        };
        cmd.execute().await.unwrap();
        assert_eq!(
            std::env::var(GMAIL_ACCOUNT_ENV).ok().as_deref(),
            Some("personal")
        );
    }

    #[tokio::test]
    async fn execute_routes_account_list_without_client_resolution() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Account(account::AccountCommand {
                command: account::AccountSubcommands::List(account::list::ListCommand {
                    output: OutputFormat::Table,
                }),
            }),
        };
        // Succeeds even with zero credentials configured — proving Account
        // subcommands never resolve a client (unlike every other
        // subcommand, which errors on missing credentials).
        cmd.execute().await.unwrap();
    }

    #[tokio::test]
    async fn dispatch_routes_search() {
        let cmd = GmailSubcommands::Search(search::SearchCommand {
            query: "label:finance".to_string(),
            limit: 10,
            enrich: false,
            concurrency: 4,
            output: OutputFormat::Table,
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_read() {
        let cmd = GmailSubcommands::Read(read::ReadCommand {
            message_id: "msg1".to_string(),
            args: read::MessageOutputArgs {
                out_file: None,
                detail: read::ReadDetail::Full,
                output: read::ReadOutputFormat::Table,
                fold_quotes: false,
            },
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_thread() {
        let cmd = GmailSubcommands::Thread(thread::ThreadCommand {
            thread_id: "t1".to_string(),
            output: OutputFormat::Table,
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_label_list() {
        let cmd = GmailSubcommands::Label(label::LabelCommand {
            command: label::LabelSubcommands::List(label::list::ListCommand {
                output: OutputFormat::Table,
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_draft_list() {
        let cmd = GmailSubcommands::Draft(draft::DraftCommand {
            command: draft::DraftSubcommands::List(draft::list::ListCommand {
                query: None,
                limit: 10,
                output: OutputFormat::Table,
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_draft_show() {
        let cmd = GmailSubcommands::Draft(draft::DraftCommand {
            command: draft::DraftSubcommands::Show(draft::show::ShowCommand {
                draft_id: "r1".to_string(),
                args: read::MessageOutputArgs {
                    out_file: None,
                    detail: read::ReadDetail::Full,
                    output: read::ReadOutputFormat::Table,
                    fold_quotes: false,
                },
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_draft_create() {
        let cmd = GmailSubcommands::Draft(draft::DraftCommand {
            command: draft::DraftSubcommands::Create(draft::create::CreateCommand {
                from: None,
                to: vec!["alice@example.com".to_string()],
                cc: vec![],
                bcc: vec![],
                subject: Some("Report".to_string()),
                body: Some("Hi.".to_string()),
                body_file: None,
                html_body: None,
                html_body_file: None,
                attach: vec![],
                reply_to: None,
                reply_all: false,
                raw: None,
                output: OutputFormat::Table,
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_draft_update() {
        let cmd = GmailSubcommands::Draft(draft::DraftCommand {
            command: draft::DraftSubcommands::Update(draft::update::UpdateCommand {
                draft_id: "r1".to_string(),
                from: None,
                to: vec![],
                cc: vec![],
                bcc: vec![],
                subject: Some("RE: Report".to_string()),
                body: Some("Hi.".to_string()),
                body_file: None,
                html_body: None,
                html_body_file: None,
                attach: vec![],
                remove_attachment: vec![],
                raw: None,
                if_message_id: None,
                output: OutputFormat::Table,
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_label_add() {
        let cmd = GmailSubcommands::Label(label::LabelCommand {
            command: label::LabelSubcommands::Add(label::add::AddCommand {
                message_ids: vec!["m1".to_string()],
                label: "IMPORTANT".to_string(),
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_label_remove() {
        let cmd = GmailSubcommands::Label(label::LabelCommand {
            command: label::LabelSubcommands::Remove(label::remove::RemoveCommand {
                message_ids: vec!["m1".to_string()],
                label: "IMPORTANT".to_string(),
                force: true,
                dry_run: false,
            }),
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_sync() {
        let cmd = GmailSubcommands::Sync(sync::SyncCommand {
            output_dir: std::path::PathBuf::from("/tmp/does-not-matter"),
            query: None,
            exclude_label: Vec::new(),
            full: false,
            retry_pending: false,
            concurrency: 4,
            dry_run: false,
            extract_attachments: false,
            quiet: false,
            output: OutputFormat::Table,
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    #[tokio::test]
    async fn dispatch_routes_insert() {
        let cmd = GmailSubcommands::Insert(insert::InsertCommand {
            archive_dir: std::path::PathBuf::from("/tmp/does-not-matter"),
            selection: selection::SelectionArgs {
                all: true,
                ..Default::default()
            },
            limit: 0,
            label: None,
            drop_label: Vec::new(),
            concurrency: 4,
            verify_remote: false,
            dry_run: true,
            quiet: true,
            output: OutputFormat::Table,
        });
        assert!(cmd.dispatch(&dead_client()).await.is_err());
    }

    fn sync_all_command() -> sync_all::SyncAllCommand {
        sync_all::SyncAllCommand {
            context_dir: None,
            concurrency: None,
            full: false,
            retry_pending: false,
            dry_run: false,
            quiet: false,
            output: OutputFormat::Table,
        }
    }

    #[tokio::test]
    async fn execute_rejects_account_flag_with_sync_all() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();

        let cmd = GmailCommand {
            account: Some("work".to_string()),
            command: GmailSubcommands::SyncAll(sync_all_command()),
        };
        let err = cmd.execute().await.unwrap_err();
        assert!(err
            .to_string()
            .contains("--account is not compatible with sync-all"));
    }

    #[tokio::test]
    async fn execute_sync_all_never_sets_the_account_env_var() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let dir = guard.clear_credentials();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::SyncAll(sync_all::SyncAllCommand {
                context_dir: Some(dir.path().to_path_buf()),
                ..sync_all_command()
            }),
        };
        // No gmail-sync.yaml exists under `dir` — this is expected to
        // fail with a config-loading error, never a network/dispatch
        // error, proving `SyncAll` never reached the shared-client
        // `dispatch` path (which would panic on `unreachable!()`).
        let err = cmd.execute().await.unwrap_err();
        assert!(err.to_string().contains("no gmail-sync.yaml found"));
        assert_eq!(std::env::var(GMAIL_ACCOUNT_ENV).ok(), None);
    }

    #[tokio::test]
    async fn execute_routes_extract_attachments_without_client_resolution() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        let archive_dir = tempfile::tempdir().unwrap();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::ExtractAttachments(
                extract_attachments::ExtractAttachmentsCommand {
                    archive_dir: archive_dir.path().to_path_buf(),
                    dry_run: false,
                    quiet: true,
                    output: OutputFormat::Table,
                },
            ),
        };
        // Succeeds even with zero credentials configured (an empty
        // archive is simply "nothing to do") — proving
        // `ExtractAttachments` never resolves a client, unlike every
        // subcommand routed through `dispatch`.
        cmd.execute().await.unwrap();
    }

    #[tokio::test]
    async fn execute_rejects_account_flag_with_extract_attachments() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        let archive_dir = tempfile::tempdir().unwrap();

        let cmd = GmailCommand {
            account: Some("work".to_string()),
            command: GmailSubcommands::ExtractAttachments(
                extract_attachments::ExtractAttachmentsCommand {
                    archive_dir: archive_dir.path().to_path_buf(),
                    dry_run: false,
                    quiet: true,
                    output: OutputFormat::Table,
                },
            ),
        };
        let err = cmd.execute().await.unwrap_err();
        assert!(err
            .to_string()
            .contains("--account is not compatible with extract-attachments"));
        assert_eq!(std::env::var(GMAIL_ACCOUNT_ENV).ok(), None);
    }

    #[tokio::test]
    async fn execute_routes_render_without_client_resolution() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        let dir = tempfile::tempdir().unwrap();
        let path = dir.path().join("m1.eml");
        std::fs::write(&path, "Subject: Hi\r\n\r\nBody.").unwrap();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Render(render::RenderCommand {
                paths: vec![path],
                archive_dir: None,
                selection: SelectionArgs::default(),
                out_dir: None,
                output: OutputFormat::Table,
                fold_quotes: false,
            }),
        };
        // Succeeds even with zero credentials configured — proving `Render`
        // never resolves a client, unlike every subcommand routed through
        // `dispatch`.
        cmd.execute().await.unwrap();
    }

    #[tokio::test]
    async fn execute_routes_render_archive_dir_without_client_resolution() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        let archive_dir = tempfile::tempdir().unwrap();

        let cmd = GmailCommand {
            account: None,
            command: GmailSubcommands::Render(render::RenderCommand {
                paths: Vec::new(),
                archive_dir: Some(archive_dir.path().to_path_buf()),
                selection: SelectionArgs {
                    all: true,
                    ..SelectionArgs::default()
                },
                out_dir: None,
                output: OutputFormat::Table,
                fold_quotes: false,
            }),
        };
        // Succeeds even with zero credentials configured (an empty archive
        // is simply "nothing to render") — proving `Render`'s
        // `--archive-dir --all` mode never resolves a client either.
        cmd.execute().await.unwrap();
    }

    #[tokio::test]
    async fn execute_rejects_account_flag_with_render() {
        let guard = crate::gmail::test_support::EnvGuard::take();
        let _dir = guard.clear_credentials();
        let dir = tempfile::tempdir().unwrap();
        let path = dir.path().join("m1.eml");
        std::fs::write(&path, "Subject: Hi\r\n\r\nBody.").unwrap();

        let cmd = GmailCommand {
            account: Some("work".to_string()),
            command: GmailSubcommands::Render(render::RenderCommand {
                paths: vec![path],
                archive_dir: None,
                selection: SelectionArgs::default(),
                out_dir: None,
                output: OutputFormat::Table,
                fold_quotes: false,
            }),
        };
        let err = cmd.execute().await.unwrap_err();
        assert!(err
            .to_string()
            .contains("--account is not compatible with render"));
        assert_eq!(std::env::var(GMAIL_ACCOUNT_ENV).ok(), None);
    }
}