commit 65b97306ed532042d9d2399bbbe32bc46ebf4f0b
Author: Manu <manu@bernat.me>
Date:   Sun May 11 15:19:30 2025 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fc90de7
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "postfix-log-viewer"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+crossterm = { version = "0.27.0", features = ["event-stream"] }
+ratatui = { version = "0.24.0", features = ["crossterm"] }
+chrono = { version = "0.4.24", features = ["serde"] }
+regex = "1.9.0"
+anyhow = "1.0.71"
+log = "0.4.17"
+simplelog = "0.12.1"
+lazy_static = "1.4.0"
+
+[features]
+default = []
diff --git a/sample.log b/sample.log
new file mode 100644
index 0000000..acfab63
--- /dev/null
+++ b/sample.log
@@ -0,0 +1,14 @@
+May 11 10:00:01 mail postfix/smtpd[12345]: connect from unknown[192.168.1.100]
+May 11 10:00:02 mail postfix/smtpd[12345]: ABC12345: client=unknown[192.168.1.100]
+May 11 10:00:03 mail postfix/cleanup[12346]: ABC12345: message-id=<test@example.com>
+May 11 10:00:04 mail postfix/qmgr[12347]: ABC12345: from=<sender@example.com>, size=1234, nrcpt=1 (queue active)
+May 11 10:00:05 mail postfix/smtp[12348]: ABC12345: to=<recipient@example.com>, relay=example.com[1.2.3.4]:25, delay=1.2, delays=0.1/0.1/0.5/0.5, dsn=2.0.0, status=sent (250 OK)
+May 11 10:00:06 mail postfix/qmgr[12347]: ABC12345: removed
+
+May 11 10:01:01 mail postfix/smtpd[12350]: connect from unknown[192.168.1.101]
+May 11 10:01:02 mail postfix/smtpd[12350]: DEF67890: client=unknown[192.168.1.101]
+May 11 10:01:03 mail postfix/cleanup[12351]: DEF67890: message-id=<test2@example.com>
+May 11 10:01:04 mail postfix/qmgr[12347]: DEF67890: from=<another@example.com>, size=5678, nrcpt=2 (queue active)
+May 11 10:01:05 mail postfix/smtp[12352]: DEF67890: to=<user1@example.com>, relay=example.com[1.2.3.4]:25, delay=1.3, dsn=2.0.0, status=sent (250 OK)
+May 11 10:01:06 mail postfix/smtp[12353]: DEF67890: to=<user2@example.com>, relay=example.com[1.2.3.4]:25, delay=1.4, dsn=2.0.0, status=sent (250 OK)
+May 11 10:01:07 mail postfix/qmgr[12347]: DEF67890: removed
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3d9dcbe
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,85 @@
+mod models;
+mod parser;
+mod ui;
+
+use anyhow::{Context, Result};
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyEventKind},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use ratatui::{backend::CrosstermBackend, Terminal};
+use std::{env, fs, io, time::Duration};
+use ui::App;
+
+fn run_app(
+    terminal: &mut Terminal<CrosstermBackend<io::Stdout>>,
+    mut app: App,
+) -> io::Result<()> {
+    let tick_rate = Duration::from_millis(250);
+    
+    loop {
+        terminal.draw(|f| ui::ui(f, &app))?;
+        
+        if crossterm::event::poll(tick_rate)? {
+            if let Event::Key(key) = event::read()? {
+                if key.kind == KeyEventKind::Press {
+                    app.on_key(key);
+                }
+            }
+        }
+        
+        if app.should_quit {
+            return Ok(());
+        }
+    }
+}
+
+fn main() -> Result<()> {
+    // Parse command line arguments
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 {
+        eprintln!("Usage: {} <postfix-log-file>", args[0]);
+        std::process::exit(1);
+    }
+
+    // Read the log file
+    let log_content = fs::read_to_string(&args[1])
+        .with_context(|| format!("Failed to read file: {}", args[1]))?;
+
+    // Parse the log file
+    let sessions = parser::parse_log_file(&log_content)
+        .context("Failed to parse log file")?;
+
+    if sessions.is_empty() {
+        println!("No SMTP sessions found in the log file.");
+        return Ok(());
+    }
+
+    // Setup terminal
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture).context("Failed to setup terminal")?;
+    enable_raw_mode().context("Failed to enable raw mode")?;
+    
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend).context("Failed to create terminal")?;
+
+    // Create app and run it
+    let app = App::new(&sessions);
+    let res = run_app(&mut terminal, app);
+
+    // Restore terminal
+    let _ = disable_raw_mode();
+    let _ = execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    );
+    let _ = terminal.show_cursor();
+
+    if let Err(err) = res {
+        eprintln!("Error: {:?}", err);
+    }
+
+    Ok(())
+}
diff --git a/src/models.rs b/src/models.rs
new file mode 100644
index 0000000..87c2f9c
--- /dev/null
+++ b/src/models.rs
@@ -0,0 +1,83 @@
+use chrono::NaiveDateTime;
+
+#[derive(Debug, Clone)]
+pub struct LogEntry {
+    pub timestamp: NaiveDateTime,
+    pub hostname: String,
+    pub process: String,
+    pub message: String,
+}
+
+#[derive(Debug, Clone)]
+pub struct SMTPSession {
+    pub id: String,
+    pub entries: Vec<LogEntry>,
+    pub client: Option<String>,
+    pub from: Option<String>,
+    pub to: Vec<String>,
+    pub status: Option<String>,
+    pub start_time: Option<NaiveDateTime>,
+    pub end_time: Option<NaiveDateTime>,
+}
+
+impl SMTPSession {
+    pub fn new(id: &str) -> Self {
+        SMTPSession {
+            id: id.to_string(),
+            entries: Vec::new(),
+            client: None,
+            from: None,
+            to: Vec::new(),
+            status: None,
+            start_time: None,
+            end_time: None,
+        }
+    }
+
+    pub fn add_entry(&mut self, entry: LogEntry) {
+        if self.start_time.is_none() || entry.timestamp < self.start_time.unwrap() {
+            self.start_time = Some(entry.timestamp);
+        }
+        if self.end_time.is_none() || entry.timestamp > self.end_time.unwrap() {
+            self.end_time = Some(entry.timestamp);
+        }
+        self.entries.push(entry);
+    }
+
+    pub fn update_from_message(&mut self, message: &str) {
+        // Extract client information
+        if let Some(caps) = CLIENT_RE.captures(message) {
+            self.client = Some(caps[1].to_string());
+        }
+        
+        // Extract from address
+        if let Some(caps) = FROM_RE.captures(message) {
+            self.from = Some(caps[1].to_string());
+        }
+        
+        // Extract to address
+        if let Some(caps) = TO_RE.captures(message) {
+            if !self.to.contains(&caps[1].to_string()) {
+                self.to.push(caps[1].to_string());
+            }
+        }
+        
+        // Extract status
+        if let Some(caps) = STATUS_RE.captures(message) {
+            self.status = Some(caps[1].to_string());
+        }
+    }
+}
+
+lazy_static::lazy_static! {
+    pub(crate) static ref SESSION_ID_RE: regex::Regex = 
+        regex::Regex::new(r"\b([A-F0-9]+):\s").unwrap();
+    static ref CLIENT_RE: regex::Regex = 
+        regex::Regex::new(r"client=([^,]+)").unwrap();
+    static ref FROM_RE: regex::Regex = 
+        regex::Regex::new(r"from=<([^>]+)>").unwrap();
+    static ref TO_RE: regex::Regex = 
+        regex::Regex::new(r"to=<([^>]+)>").unwrap();
+    static ref STATUS_RE: regex::Regex = 
+        regex::Regex::new(r"status=([^\s]+)").unwrap();
+}
diff --git a/src/parser.rs b/src/parser.rs
new file mode 100644
index 0000000..51f0d33
--- /dev/null
+++ b/src/parser.rs
@@ -0,0 +1,65 @@
+use crate::models::{LogEntry, SMTPSession};
+use chrono::{Datelike, NaiveDateTime};
+use regex::Regex;
+use std::collections::HashMap;
+
+lazy_static::lazy_static! {
+    static ref LOG_LINE_RE: Regex = Regex::new(
+        r"^(?P<month>\w+)\s+(?P<day>\d+)\s+(?P<time>\d+:\d+:\d+)\s+(?P<hostname>\S+)\s+(?P<process>\S+):\s+(?P<message>.*)$"
+    ).unwrap();
+}
+
+pub fn parse_log_file(contents: &str) -> anyhow::Result<Vec<SMTPSession>> {
+    let mut sessions: HashMap<String, SMTPSession> = HashMap::new();
+    
+    for line in contents.lines() {
+        if let Some(captures) = LOG_LINE_RE.captures(line) {
+            let month = &captures["month"];
+            let day = &captures["day"];
+            let time = &captures["time"];
+            let hostname = captures["hostname"].to_string();
+            let process = captures["process"].to_string();
+            let message = captures["message"].to_string();
+            
+            // Create a timestamp string in the format that chrono can parse
+            let year = chrono::Local::now().year();
+            let timestamp_str = format!("{} {} {} {}", year, month, day, time);
+            let timestamp = match NaiveDateTime::parse_from_str(&timestamp_str, "%Y %b %d %H:%M:%S") {
+                Ok(ts) => ts,
+                Err(_) => continue, // Skip lines with invalid timestamps
+            };
+            
+            let entry = LogEntry {
+                timestamp,
+                hostname,
+                process,
+                message: message.clone(),
+            };
+            
+            // Extract session ID from the message
+            if let Some(id_caps) = crate::models::SESSION_ID_RE.captures(&message) {
+                let session_id = id_caps[1].to_string();
+                
+                // Get or create the session
+                let session = sessions.entry(session_id.clone())
+                    .or_insert_with(|| SMTPSession::new(&session_id));
+                
+                // Add the entry to the session
+                session.add_entry(entry);
+                
+                // Update session information from the message
+                session.update_from_message(&message);
+            }
+        }
+    }
+    
+    // Convert the HashMap to a Vec and sort by start time (most recent first)
+    let mut sessions: Vec<SMTPSession> = sessions.into_iter().map(|(_, v)| v).collect();
+    sessions.sort_by(|a, b| {
+        let a_time = a.start_time.unwrap_or_else(|| chrono::DateTime::<chrono::Utc>::MIN_UTC.naive_local());
+        let b_time = b.start_time.unwrap_or_else(|| chrono::DateTime::<chrono::Utc>::MIN_UTC.naive_local());
+        b_time.cmp(&a_time) // Sort in descending order (newest first)
+    });
+    
+    Ok(sessions)
+}
diff --git a/src/ui.rs b/src/ui.rs
new file mode 100644
index 0000000..0ab3656
--- /dev/null
+++ b/src/ui.rs
@@ -0,0 +1,310 @@
+use crate::models::SMTPSession;
+use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use ratatui::{
+    prelude::*,
+    widgets::*,
+    Frame,
+};
+use std::borrow::Cow;
+
+pub struct App<'a> {
+    pub sessions: &'a [SMTPSession],
+    filtered_sessions: Vec<usize>,
+    pub selected_session: Option<usize>,
+    pub scroll: u16,
+    pub should_quit: bool,
+    filter_type: Option<FilterType>,
+    filter_text: String,
+    pub log_display_mode: LogDisplayMode,
+}
+
+#[derive(PartialEq)]
+pub enum LogDisplayMode {
+    SingleLine,
+    MultiLine,
+}
+
+#[derive(PartialEq)]
+enum FilterType {
+    From,
+    To,
+}
+
+impl<'a> App<'a> {
+    pub fn new(sessions: &'a [SMTPSession]) -> Self {
+        let filtered_sessions = (0..sessions.len()).collect();
+        App {
+            sessions,
+            filtered_sessions,
+            selected_session: if !sessions.is_empty() { Some(0) } else { None },
+            scroll: 0,
+            should_quit: false,
+            filter_type: None,
+            filter_text: String::new(),
+            log_display_mode: LogDisplayMode::SingleLine,
+        }
+    }
+
+    fn apply_filters(&mut self) {
+        self.filtered_sessions = (0..self.sessions.len())
+            .filter(|&i| {
+                let session = &self.sessions[i];
+                if self.filter_text.is_empty() {
+                    return true;
+                }
+                match self.filter_type {
+                    Some(FilterType::From) => session.from.as_ref()
+                        .map_or(false, |from| from.contains(&self.filter_text)),
+                    Some(FilterType::To) => session.to.iter()
+                        .any(|to| to.contains(&self.filter_text)),
+                    None => true,
+                }
+            })
+            .collect();
+        
+        // Reset selection if current selection is no longer in filtered list
+        if let Some(selected) = self.selected_session {
+            if !self.filtered_sessions.contains(&selected) {
+                self.selected_session = if !self.filtered_sessions.is_empty() {
+                    Some(self.filtered_sessions[0])
+                } else {
+                    None
+                };
+            }
+        } else if !self.filtered_sessions.is_empty() {
+            self.selected_session = Some(self.filtered_sessions[0]);
+        }
+    }
+    
+    pub fn on_tick(&mut self) {
+        // Update app state if needed
+    }
+
+    pub fn on_key(&mut self, key: KeyEvent) {
+        match key.code {
+            KeyCode::Char('q') => self.should_quit = true,
+            KeyCode::Char('c') if key.modifiers.intersects(KeyModifiers::CONTROL) => self.should_quit = true,
+            KeyCode::Down => {
+                if let Some(selected) = self.selected_session {
+                    if selected < self.sessions.len().saturating_sub(1) {
+                        self.selected_session = Some(selected + 1);
+                        self.scroll = 0;
+                    }
+                } else if !self.sessions.is_empty() {
+                    self.selected_session = Some(0);
+                }
+            }
+            KeyCode::Up => {
+                if let Some(selected) = self.selected_session {
+                    if selected > 0 {
+                        self.selected_session = Some(selected - 1);
+                        self.scroll = 0;
+                    }
+                }
+            }
+            KeyCode::Char('j') => {
+                self.scroll = self.scroll.saturating_add(1);
+            }
+            KeyCode::Char('k') => {
+                self.scroll = self.scroll.saturating_sub(1);
+            }
+            KeyCode::Char('l') => {
+                self.log_display_mode = match self.log_display_mode {
+                    LogDisplayMode::SingleLine => LogDisplayMode::MultiLine,
+                    LogDisplayMode::MultiLine => LogDisplayMode::SingleLine,
+                };
+            }
+            KeyCode::Char('f') => {
+                self.filter_type = Some(FilterType::From);
+                self.filter_text.clear();
+            }
+            KeyCode::Char('t') => {
+                self.filter_type = Some(FilterType::To);
+                self.filter_text.clear();
+            }
+            KeyCode::Char('r') => {
+                self.filter_type = None;
+                self.filter_text.clear();
+                self.apply_filters();
+            }
+            KeyCode::Enter if self.filter_type.is_some() => {
+                self.apply_filters();
+                self.filter_type = None;
+            }
+            KeyCode::Char(c) if self.filter_type.is_some() => {
+                self.filter_text.push(c);
+                self.apply_filters();
+            }
+            KeyCode::Backspace if self.filter_type.is_some() => {
+                self.filter_text.pop();
+                self.apply_filters();
+            }
+            _ => {}
+        }
+    }
+}
+
+pub fn ui(f: &mut Frame, app: &App) {
+    let chunks = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Constraint::Percentage(40), Constraint::Percentage(60)].as_ref())
+        .split(f.size());
+
+    // Left panel - Session list
+    // Display filter status
+    let filter_status = if let Some(filter_type) = &app.filter_type {
+        let filter_label = match filter_type {
+            FilterType::From => "Filter from",
+            FilterType::To => "Filter to",
+        };
+        format!("{}: {}", filter_label, app.filter_text)
+    } else if !app.filtered_sessions.is_empty() {
+        format!("Filter active ({} sessions)", app.filtered_sessions.len())
+    } else {
+        String::from("No active filter")
+    };
+
+    let session_list: Vec<ListItem> = app
+        .filtered_sessions
+        .iter()
+        .map(|&i| {
+            let session = &app.sessions[i];
+            let is_selected = app.selected_session == Some(i);
+            let style = if is_selected {
+                Style::default().add_modifier(Modifier::BOLD)
+            } else {
+                Style::default()
+            };
+            
+            let from = session.from.as_deref().unwrap_or("<unknown>");
+            let to_count = session.to.len();
+            let client = session.client.as_deref().unwrap_or("<unknown>");
+            let time = session.start_time
+                .map(|t| t.format("%Y-%m-%d %H:%M:%S").to_string())
+                .unwrap_or_else(|| "????-??-?? ??:??:??".to_string());
+                
+            let line = format!("{} {} → {} ({} recipient{})", 
+                time, from, client, to_count, if to_count != 1 { "s" } else { "" });
+            
+            ListItem::new(Line::from(Span::styled(line, style)))
+        })
+        .collect();
+    
+    // Show filter status in the title
+    let sessions_title = format!("Sessions {}", filter_status);
+
+    let mut state = ListState::default();
+    state.select(app.selected_session);
+    
+    let sessions_list = List::new(session_list)
+        .block(Block::default().borders(Borders::ALL).title(sessions_title))
+        .highlight_style(Style::default().bg(Color::DarkGray));
+    
+    f.render_stateful_widget(sessions_list, chunks[0], &mut state);
+
+    // Right panel - Session details
+    let details = if let Some(selected_idx) = app.selected_session {
+        if let Some(selected) = app.sessions.get(selected_idx) {
+            let mut lines = vec![];
+            
+            // Session header
+            lines.push(Line::from(vec![
+                Span::styled("Session ID: ", Style::default().add_modifier(Modifier::BOLD)),
+                Span::raw(&selected.id),
+            ]));
+            
+            if let Some(from) = &selected.from {
+                lines.push(Line::from(vec![
+                    Span::styled("From: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(from),
+                ]));
+            }
+            
+            if !selected.to.is_empty() {
+                let to_str = selected.to.join(", ");
+                lines.push(Line::from(vec![
+                    Span::styled("To: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(to_str),
+                ]));
+            }
+            
+            if let Some(client) = &selected.client {
+                lines.push(Line::from(vec![
+                    Span::styled("Client: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw(client),
+                ]));
+            }
+            
+            if let Some(status) = &selected.status {
+                lines.push(Line::from(vec![
+                    Span::styled("Status: ", Style::default().add_modifier(Modifier::BOLD)),
+                    Span::styled(
+                        status,
+                        match status.as_str() {
+                            "sent" => Style::default().fg(Color::Green),
+                            "deferred" => Style::default().fg(Color::Yellow),
+                            "bounced" => Style::default().fg(Color::Red),
+                            _ => Style::default(),
+                        },
+                    ),
+                ]));
+            }
+            
+            // Add a separator
+            lines.push(Line::from(""));
+            lines.push(Line::from(Span::styled("Log Entries:", Style::default().add_modifier(Modifier::BOLD))));
+            
+            // Add log entries
+            let panel_width = chunks[1].width as usize;
+            for entry in &selected.entries {
+                let time = entry.timestamp.format("%H:%M:%S").to_string();
+                let log_line = format!("{} {}", time, entry.message);
+                
+                match app.log_display_mode {
+                    LogDisplayMode::SingleLine => {
+                        // Truncate the line if it's too long
+                        let max_len = panel_width.saturating_sub(3); // Leave room for "..."
+                        if log_line.len() > max_len {
+                            let truncated = log_line.chars().take(max_len).collect::<String>();
+                            lines.push(Line::from(format!("{}...", truncated)));
+                        } else {
+                            lines.push(Line::from(log_line));
+                        }
+                    }
+                    LogDisplayMode::MultiLine => {
+                        // Split long lines into multiple lines
+                        let mut remaining = log_line.as_str();
+                        while !remaining.is_empty() {
+                            let chunk: String = remaining.chars()
+                                .take(panel_width)
+                                .collect();
+                            let chunk_len = chunk.len();
+                            lines.push(Line::from(chunk));
+                            remaining = &remaining[chunk_len..];
+                        }
+                    }
+                }
+            }
+            
+            Paragraph::new(lines)
+        } else {
+            Paragraph::new("Invalid session selected")
+        }
+    } else if !app.filtered_sessions.is_empty() {
+        Paragraph::new("No matching sessions found")
+    } else {
+        Paragraph::new("No sessions available")
+    };
+
+    let display_mode = match app.log_display_mode {
+        LogDisplayMode::SingleLine => "Single-line",
+        LogDisplayMode::MultiLine => "Multi-line",
+    };
+    
+    let details_block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!("Session Details | Logs: {}", display_mode));
+    
+    let details_content = details.block(details_block);
+    f.render_widget(details_content, chunks[1]);
+}