claudectl/
process.rs

1use crate::session::{ClaudeSession, SessionStatus};
2
3/// Check which PIDs are alive and fetch TTY, CPU%, MEM, command args — all via `ps`.
4/// No sysinfo dependency needed.
5pub fn fetch_and_enrich(sessions: &mut [ClaudeSession]) {
6    if sessions.is_empty() {
7        return;
8    }
9
10    let pids: Vec<String> = sessions.iter().map(|s| s.pid.to_string()).collect();
11    let pid_arg = pids.join(",");
12
13    let output = std::process::Command::new("ps")
14        .args(["-o", "pid=,tty=,%cpu=,rss=,command=", "-p", &pid_arg])
15        .env_clear()
16        .output();
17
18    let output = match output {
19        Ok(o) => o,
20        Err(e) => {
21            crate::logger::log("ERROR", &format!("ps command failed: {e}"));
22            // ps failed — mark all as Finished (will show tombstone for 30s)
23            for s in sessions.iter_mut() {
24                s.status = SessionStatus::Finished;
25                s.cpu_percent = 0.0;
26            }
27            return;
28        }
29    };
30
31    let stdout = String::from_utf8_lossy(&output.stdout);
32
33    // Collect alive PIDs from ps output
34    let mut alive_pids = std::collections::HashSet::new();
35
36    for line in stdout.lines() {
37        let trimmed = line.trim();
38        let fields: Vec<&str> = trimmed.split_whitespace().collect();
39        if fields.len() < 5 {
40            continue;
41        }
42        let Ok(pid) = fields[0].parse::<u32>() else {
43            continue;
44        };
45        let tty = fields[1].to_string();
46        let cpu = fields[2].parse::<f32>().unwrap_or(0.0);
47        let rss_kb = fields[3].parse::<f64>().unwrap_or(0.0);
48        let mem_mb = rss_kb / 1024.0;
49        let command = fields[4..].join(" ");
50
51        alive_pids.insert(pid);
52
53        for session in sessions.iter_mut() {
54            if session.pid == pid {
55                session.tty = tty.clone();
56                session.mem_mb = mem_mb;
57
58                // CPU smoothing: track last 3 readings, use average
59                session.cpu_history.push(cpu);
60                if session.cpu_history.len() > 3 {
61                    session.cpu_history.remove(0);
62                }
63                session.cpu_percent =
64                    session.cpu_history.iter().sum::<f32>() / session.cpu_history.len() as f32;
65
66                // Extract args (everything after "claude")
67                if let Some(idx) = command.find("claude") {
68                    let after_claude = &command[idx + 6..];
69                    session.command_args = after_claude.trim().to_string();
70                }
71
72                // Extract session name from --name or --resume
73                let cmd_parts: Vec<&str> = command.split_whitespace().collect();
74                extract_session_meta(&cmd_parts, session);
75
76                break;
77            }
78        }
79    }
80
81    // Mark dead PIDs as Finished instead of removing them immediately.
82    // They'll be displayed briefly so the user can see what exited.
83    for session in sessions.iter_mut() {
84        if !alive_pids.contains(&session.pid) {
85            session.status = crate::session::SessionStatus::Finished;
86            session.cpu_percent = 0.0;
87        }
88    }
89}
90
91fn extract_session_meta(cmd: &[&str], session: &mut ClaudeSession) {
92    let mut i = 0;
93    while i < cmd.len() {
94        match cmd[i] {
95            "--name" | "-n" => {
96                if i + 1 < cmd.len() {
97                    session.session_name = cmd[i + 1].to_string();
98                    i += 2;
99                    continue;
100                }
101            }
102            "--resume" | "-r" => {
103                if i + 1 < cmd.len() {
104                    let val = cmd[i + 1];
105                    if !looks_like_uuid(val) {
106                        session.session_name = val.to_string();
107                    }
108                    i += 2;
109                    continue;
110                }
111            }
112            _ => {}
113        }
114        i += 1;
115    }
116}
117
118fn looks_like_uuid(s: &str) -> bool {
119    s.len() == 36
120        && s.chars().all(|c| c.is_ascii_hexdigit() || c == '-')
121        && s.matches('-').count() == 4
122}
claudectl/process.rs

claudectl/
process.rs
