embers-cli 0.3.2

Interactive terminal UI and automation CLI for the Embers terminal multiplexer.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

//! `set-environment` / `show-environment`: session and global environments
//! applied to panes created afterwards.

use std::time::Duration;

use embers_test_support::TestServer;
use tokio::time::sleep;

use crate::support::{cli_command, run_cli, stdout};

/// Wait until the first pane of `session`'s first window shows `needle`.
async fn wait_for_capture(server: &TestServer, session: &str, needle: &str) -> String {
    let panes = stdout(&run_cli(
        server,
        ["list-panes", "-t", &format!("{session}:0")],
    ));
    let pane = panes.split('\t').next().expect("a pane").to_owned();
    let deadline = tokio::time::Instant::now() + Duration::from_secs(5);
    loop {
        let captured = stdout(&run_cli(server, ["capture-pane", "-t", &pane]));
        if captured.contains(needle) {
            return captured;
        }
        assert!(
            tokio::time::Instant::now() < deadline,
            "timed out waiting for {needle:?}; pane shows:\n{captured}"
        );
        sleep(Duration::from_millis(50)).await;
    }
}

#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn set_and_show_environment_round_trip() {
    let server = TestServer::start().await.expect("start server");
    run_cli(&server, ["new-session", "alpha"]);

    run_cli(
        &server,
        ["set-environment", "-t", "alpha", "EDITOR", "nvim"],
    );
    run_cli(&server, ["set-environment", "-t", "alpha", "EMPTY", ""]);
    run_cli(&server, ["set-environment", "-g", "PAGER", "less -R"]);

    let session = run_cli(&server, ["show-environment", "-t", "alpha"]);
    assert_eq!(stdout(&session), "EDITOR=nvim\nEMPTY=\n");
    let global = run_cli(&server, ["show-environment", "-g"]);
    assert_eq!(stdout(&global), "PAGER=less -R\n");
    let one = run_cli(&server, ["show-environment", "-t", "alpha", "EDITOR"]);
    assert_eq!(stdout(&one), "EDITOR=nvim\n");

    run_cli(&server, ["set-environment", "-u", "-t", "alpha", "EDITOR"]);
    let session = run_cli(&server, ["show-environment", "-t", "alpha"]);
    assert_eq!(stdout(&session), "EMPTY=\n");

    let missing = cli_command(&server)
        .args(["show-environment", "-t", "alpha", "EDITOR"])
        .output()
        .expect("cli runs");
    assert!(!missing.status.success());
    assert!(String::from_utf8_lossy(&missing.stderr).contains("unknown variable"));

    let invalid = cli_command(&server)
        .args(["set-environment", "-g", "A=B", "c"])
        .output()
        .expect("cli runs");
    assert!(!invalid.status.success());

    let no_value = cli_command(&server)
        .args(["set-environment", "-g", "LONELY"])
        .output()
        .expect("cli runs");
    assert!(!no_value.status.success());

    server.shutdown().await.expect("shutdown server");
}

#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn new_panes_get_the_global_then_session_environment() {
    let server = TestServer::start().await.expect("start server");
    run_cli(&server, ["new-session", "alpha"]);
    run_cli(&server, ["new-session", "beta"]);

    run_cli(
        &server,
        ["set-environment", "-g", "EMBERS_TEST_SHARED", "global"],
    );
    run_cli(
        &server,
        ["set-environment", "-g", "EMBERS_TEST_ONLY_GLOBAL", "g"],
    );
    run_cli(
        &server,
        [
            "set-environment",
            "-t",
            "alpha",
            "EMBERS_TEST_SHARED",
            "session",
        ],
    );

    run_cli(
        &server,
        [
            "new-window",
            "-t",
            "alpha",
            "--",
            "/bin/sh",
            "-c",
            "echo \"env:$EMBERS_TEST_SHARED:$EMBERS_TEST_ONLY_GLOBAL\"; sleep 30",
        ],
    );
    wait_for_capture(&server, "alpha", "env:session:g").await;

    // Another session sees only the global value.
    run_cli(
        &server,
        [
            "new-window",
            "-t",
            "beta",
            "--",
            "/bin/sh",
            "-c",
            "echo \"env:$EMBERS_TEST_SHARED\"; sleep 30",
        ],
    );
    wait_for_capture(&server, "beta", "env:global").await;

    server.shutdown().await.expect("shutdown server");
}