commit 3963fc50c35b9f36d73b6b8bf0d8d83d5c3f00da
Author: Jana Dönszelmann <jana@donsz.nl>
Date:   Fri Feb 20 12:40:07 2026 +0100

    set envvars

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "wit-bindgen"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
+dependencies = [
+ "wit-bindgen-rust-macro",
+]
+
+[[package]]
+name = "wit-bindgen-core"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea61de684c3ea68cb082b7a88508a8b27fcc8b797d738bfc99a82facf1d752dc"
+dependencies = [
+ "anyhow",
+ "heck",
+ "wit-parser",
+]
+
+[[package]]
+name = "wit-bindgen-rust"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
+dependencies = [
+ "anyhow",
+ "heck",
+ "indexmap",
+ "prettyplease",
+ "syn 2.0.117",
+ "wasm-metadata",
+ "wit-bindgen-core",
+ "wit-component",
+]
+
+[[package]]
+name = "wit-bindgen-rust-macro"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
+dependencies = [
+ "anyhow",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+ "wit-bindgen-core",
+ "wit-bindgen-rust",
+]
+
+[[package]]
+name = "wit-component"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
+dependencies = [
+ "anyhow",
+ "bitflags 2.11.0",
+ "indexmap",
+ "log",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "wasm-encoder",
+ "wasm-metadata",
+ "wasmparser",
+ "wit-parser",
+]
+
+[[package]]
+name = "wit-parser"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
+dependencies = [
+ "anyhow",
+ "id-arena",
+ "indexmap",
+ "log",
+ "semver",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "unicode-xid",
+ "wasmparser",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7d4a08c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "rustc-logviz"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "lv"
+path = "./src/main.rs"
+
+[dependencies]
+clap = {version="4.5", features=["derive"]}
+jiff = {version = "0.2", features = ["serde"]}
+ratatui = {version = "0.30.0", features=["unstable-rendered-line-info"]}
+ratatui-themes = { version = "0.2", features = ["serde"] }
+tui-widget-list = "0.15"
+serde = {version = "1", features = ["derive"]}
+serde_json = "1"
+thiserror = "2"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..84baf98
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,107 @@
+use std::{
+    env::temp_dir,
+    ffi::OsString,
+    fs::{self, File},
+    path::PathBuf,
+    process::{Command, exit},
+};
+
+mod tui;
+
+use clap::{Parser, Subcommand};
+use jiff::Zoned;
+
+#[derive(Subcommand, Debug)]
+enum Preset {
+    /// Explore logs
+    Show,
+
+    /// Get all the typesystem related logs
+    Types,
+    /// Get all logs
+    All,
+    Crates {
+        #[arg(short, long)]
+        crates: Vec<String>,
+    },
+}
+
+fn default_tempdir() -> PathBuf {
+    temp_dir().join("rustc-logviz")
+}
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    #[command(subcommand)]
+    preset: Preset,
+
+    #[arg(default_value_os_t = default_tempdir())]
+    #[arg(global = true)]
+    #[arg(long = "logs-dir")]
+    logs_dir: PathBuf,
+
+    #[arg(trailing_var_arg = true)]
+    #[arg(allow_hyphen_values = true)]
+    #[arg(global = true)]
+    rest: Vec<OsString>,
+}
+
+fn main() {
+    let Args {
+        preset,
+        logs_dir,
+        rest,
+    } = Args::parse();
+
+    let rustc_log = match preset {
+        Preset::Show => {
+            tui::run(logs_dir);
+            exit(0);
+        }
+        Preset::Types => {
+            "rustc_hir_typeck,rustc_infer,rustc_next_trait_solver,rustc_middle,rustc_traits,rustc_trait_selection,rustc_type_ir,rustc_ty_utils".to_string()
+        }
+        Preset::All => "debug".to_string(),
+        Preset::Crates { crates } => format!("{}", crates.join(",")),
+    };
+
+    let (first, rest) = {
+        let mut rest = rest.into_iter();
+        let Some(first) = rest.next() else {
+            eprintln!("no command given, exiting");
+            exit(0);
+        };
+        (first, rest.collect::<Vec<_>>())
+    };
+
+    if let Err(e) = fs::create_dir_all(&logs_dir) {
+        eprintln!("failed to create logs dir at {}: {e:?}", logs_dir.display());
+        exit(1)
+    }
+
+    let now = Zoned::now().strftime("%b %e %H:%M:%S");
+    let log_file_path = logs_dir.join(format!("{now}.log"));
+    let log_file = match File::create(&log_file_path) {
+        Ok(i) => i,
+        Err(e) => {
+            eprintln!(
+                "failed to create logfile at {}: {e:?}",
+                log_file_path.display()
+            );
+            exit(1)
+        }
+    };
+
+    eprintln!("outputting json logs to {}", log_file_path.display());
+    if let Err(e) = Command::new(first)
+        .args(rest)
+        .env("RUSTC_LOG", rustc_log)
+        .env("RUSTC_LOG_FORMAT_JSON", "1")
+        .env("RUSTC_LOG_OUTPUT_TARGET", log_file_path)
+        .status()
+    {
+        eprintln!("failed to spawn command: {e:?}, exiting");
+        exit(1);
+    }
+}
diff --git a/src/tui/filter.rs b/src/tui/filter.rs
new file mode 100644
index 0000000..e3ec3e9
--- /dev/null
+++ b/src/tui/filter.rs
@@ -0,0 +1,158 @@
+use crate::tui::model::LogEntry;
+
+pub enum WipMatcher {
+    Field {
+        name: Option<String>,
+        value: Option<serde_json::Value>,
+    },
+    Specific {
+        path: Option<Vec<usize>>,
+    },
+}
+
+impl WipMatcher {
+    fn validate(&self) -> Option<Matcher> {
+        match self {
+            WipMatcher::Field {
+                name: Some(name),
+                value: Some(value),
+            } => Some(Matcher::Field {
+                name: name.clone(),
+                value: value.clone(),
+            }),
+            WipMatcher::Specific { path: Some(path) } => {
+                Some(Matcher::Specific { path: path.clone() })
+            }
+            _ => None,
+        }
+    }
+}
+
+pub enum Matcher {
+    Field {
+        name: String,
+        value: serde_json::Value,
+    },
+    Specific {
+        path: Vec<usize>,
+    },
+}
+
+impl Matcher {
+    pub fn matches(&self, entry: &LogEntry) -> bool {
+        match self {
+            Matcher::Field { name, value } => entry
+                .all_fields()
+                .fields
+                .get(name)
+                .is_some_and(|v| v == value),
+            Matcher::Specific { path } => false,
+        }
+    }
+}
+
+#[derive(Clone)]
+pub enum FilterKind {
+    Inline,
+    Remove,
+}
+
+pub struct Filter {
+    pub matcher: Matcher,
+    pub kind: FilterKind,
+}
+
+pub struct WipFilter {
+    pub matcher: Option<WipMatcher>,
+    pub kind: Option<FilterKind>,
+    pub selection: FilterSelection,
+}
+
+impl WipFilter {
+    pub fn validate(&self) -> Option<Filter> {
+        let Self {
+            matcher,
+            kind,
+            selection: _,
+        } = self;
+        let Some(matcher) = matcher else { return None };
+        Some(Filter {
+            matcher: matcher.validate()?,
+            kind: kind.clone()?,
+        })
+    }
+
+    pub fn clear(&mut self) {
+        match self.selection {
+            FilterSelection::Kind => self.kind = None,
+            FilterSelection::MatcherKind => {}
+            FilterSelection::Matcher => {}
+            FilterSelection::Confirm => {}
+        }
+    }
+
+    pub fn right(&mut self) {
+        match self.selection {
+            FilterSelection::Kind => {
+                self.kind = Some(match self.kind {
+                    None => FilterKind::Inline,
+                    Some(FilterKind::Inline) => FilterKind::Remove,
+                    Some(FilterKind::Remove) => FilterKind::Inline,
+                })
+            }
+            FilterSelection::MatcherKind => {}
+            FilterSelection::Matcher => {}
+            FilterSelection::Confirm => {}
+        }
+    }
+    pub fn left(&mut self) {
+        match self.selection {
+            FilterSelection::Kind => {
+                self.kind = Some(match self.kind {
+                    None => FilterKind::Remove,
+                    Some(FilterKind::Remove) => FilterKind::Inline,
+                    Some(FilterKind::Inline) => FilterKind::Inline,
+                })
+            }
+            FilterSelection::MatcherKind => {}
+            FilterSelection::Matcher => {}
+            FilterSelection::Confirm => {}
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+pub enum FilterSelection {
+    Kind,
+    MatcherKind,
+    Matcher,
+    Confirm,
+}
+
+impl FilterSelection {
+    pub fn next(&mut self) {
+        *self = match *self {
+            Self::Kind => Self::MatcherKind,
+            Self::MatcherKind => Self::Matcher,
+            Self::Matcher => Self::Confirm,
+            Self::Confirm => Self::Confirm,
+        };
+    }
+
+    pub fn prev(&mut self) {
+        *self = match self {
+            Self::Kind => Self::Kind,
+            Self::MatcherKind => Self::Kind,
+            Self::Matcher => Self::MatcherKind,
+            Self::Confirm => Self::Matcher,
+        };
+    }
+}
+
+#[derive(Clone, Copy)]
+pub enum FieldMatcherSelection {
+    Field,
+    Value,
+}
+
+impl FieldMatcherSelection {}
diff --git a/src/tui/log_viewer.rs b/src/tui/log_viewer.rs
new file mode 100644
index 0000000..418b8a8
--- /dev/null
+++ b/src/tui/log_viewer.rs
@@ -0,0 +1,166 @@
+use std::{collections::HashMap, mem, rc::Rc};
+
+use crate::tui::{
+    model::LogEntry,
+    reader::{FilterAdapter, LogfileReader},
+};
+use tui_widget_list::ListState;
+
+#[derive(Default, Clone)]
+pub struct LogView {
+    first_item: usize,
+    selected: usize,
+}
+
+pub struct LogViewer {
+    stack: Vec<LogView>,
+    curr: LogView,
+    cache: HashMap<Vec<usize>, LogView>,
+
+    pub last_height: usize,
+    pub footer_selected: bool,
+    pub footer_list: ListState,
+}
+
+impl LogViewer {
+    pub fn new() -> Self {
+        Self {
+            stack: Vec::new(),
+            curr: LogView::default(),
+            cache: HashMap::new(),
+            footer_list: ListState::default(),
+            footer_selected: false,
+            last_height: 0,
+        }
+    }
+
+    pub fn update_num_items(&mut self, num_visible_items: usize) {
+        while self.curr.selected >= self.curr.first_item + num_visible_items {
+            self.curr.first_item += 1;
+        }
+        self.last_height = num_visible_items;
+    }
+
+    pub fn footer_fields(&self, file: &mut LogfileReader) -> Vec<(String, serde_json::Value)> {
+        if let Some(selected) = self.selected(file) {
+            selected.all_fields().fields.into_iter().collect::<Vec<_>>()
+        } else {
+            Vec::new()
+        }
+    }
+
+    pub fn items(
+        &self,
+        file: &mut LogfileReader,
+        max: usize,
+    ) -> Option<(Vec<Rc<LogEntry>>, usize, usize)> {
+        let items: Vec<_> = if self.stack.is_empty() {
+            file.iter_from(self.curr.first_item).take(max).collect()
+        } else {
+            let mut stack = self.stack.iter();
+            let first = stack.next().unwrap();
+            let mut curr_log_entry = file.iter_from(first.selected).next()?;
+            for elem in stack {
+                curr_log_entry = curr_log_entry.get(elem.selected)?;
+            }
+
+            match curr_log_entry.as_ref() {
+                LogEntry::Single { .. } => return None,
+                LogEntry::Sub { sub_entries, .. } => {
+                    FilterAdapter::new(file, &sub_entries[self.curr.first_item..])
+                        .take(max)
+                        .cloned()
+                        .collect()
+                }
+            }
+        };
+
+        Some((items, self.curr.first_item, self.curr.selected))
+    }
+
+    pub fn selected(&self, file: &mut LogfileReader) -> Option<Rc<LogEntry>> {
+        self.items(file, self.curr.selected - self.curr.first_item + 1)?
+            .0
+            .get(self.curr.selected - self.curr.first_item)
+            .cloned()
+    }
+
+    fn update_footer_select(&mut self) {
+        self.footer_list.select(Some(0));
+    }
+
+    pub fn prev(&mut self) {
+        if self.footer_selected {
+            self.footer_list.previous();
+        } else {
+            self.curr.selected = self.curr.selected.saturating_sub(1);
+            self.curr.first_item = self.curr.first_item.min(self.curr.selected);
+            self.update_footer_select();
+        }
+    }
+
+    pub fn next(&mut self) {
+        if self.footer_selected {
+            self.footer_list.next();
+        } else {
+            self.curr.selected += 1;
+            self.update_footer_select();
+        }
+    }
+
+    pub fn page_down(&mut self) {
+        self.curr.selected += self.last_height;
+        self.footer_selected = false;
+        self.update_footer_select();
+    }
+
+    pub fn page_up(&mut self) {
+        self.curr.selected = self.curr.selected.saturating_sub(self.last_height);
+        self.curr.first_item = self.curr.first_item.min(self.curr.selected);
+        self.footer_selected = false;
+        self.update_footer_select();
+    }
+
+    pub fn home(&mut self) {
+        if self.footer_selected {
+            self.footer_list.select(Some(0));
+        } else {
+            self.curr.selected = 0;
+            self.curr.first_item = 0;
+            self.update_footer_select();
+        }
+    }
+
+    pub fn path(&self) -> Vec<usize> {
+        self.stack.iter().map(|i| i.selected).collect()
+    }
+
+    pub fn back(&mut self) {
+        self.cache.insert(self.path(), self.curr);
+        self.curr = self.stack.pop().unwrap_or_default();
+        self.footer_selected = false;
+        self.update_footer_select();
+    }
+
+    pub fn switch_focus(&mut self) {
+        self.footer_selected = !self.footer_selected;
+    }
+
+    pub fn enter(&mut self, file: &mut LogfileReader) {
+        if !self.footer_selected {
+            let Some(s) = self.selected(file) else {
+                return;
+            };
+            if let LogEntry::Single { .. } = s.as_ref() {
+                return;
+            }
+
+            self.stack
+                .push(mem::replace(&mut self.curr, LogView::default()));
+            if let Some(cached_view) = self.cache.get(&self.path()) {
+                self.curr = *cached_view;
+            }
+            self.update_footer_select();
+        }
+    }
+}
diff --git a/src/tui/mod.rs b/src/tui/mod.rs
new file mode 100644
index 0000000..6df472d
--- /dev/null
+++ b/src/tui/mod.rs
@@ -0,0 +1,594 @@
+use ratatui_themes::{Theme, ThemeName};
+use std::{
+    fs::{self, DirEntry},
+    io,
+    path::{Path, PathBuf},
+    process::exit,
+};
+use tui_widget_list::{ListBuilder, ListView};
+
+use crate::tui::{
+    filter::{FilterKind, WipMatcher},
+    log_viewer::LogViewer,
+};
+use crate::tui::{
+    filter::{FilterSelection, WipFilter},
+    reader::LogfileReader,
+};
+use ratatui::{
+    DefaultTerminal,
+    buffer::Buffer,
+    crossterm::event::{self, Event, KeyCode, KeyModifiers},
+    layout::{Constraint, HorizontalAlignment, Layout, Rect},
+    style::Style,
+    widgets::{
+        Block, Clear, List, ListItem, ListState, Padding, Paragraph, StatefulWidget, Widget, Wrap,
+    },
+};
+
+pub mod filter;
+pub mod log_viewer;
+pub mod model;
+pub mod reader;
+
+pub fn run(logs_dir: PathBuf) {
+    let terminal = ratatui::init();
+    let theme = Theme::new(ThemeName::OneDarkPro);
+    let app_result = App::new(logs_dir, theme).run(terminal);
+    ratatui::restore();
+
+    if let Err(e) = app_result {
+        eprintln!("error in tui: {e:?}");
+        exit(1);
+    }
+}
+
+enum Tab {
+    FileChooser {
+        files: Vec<DirEntry>,
+        state: ListState,
+        last_height: usize,
+    },
+    LogViewer(LogViewer),
+    CreateFilter {
+        filter: WipFilter,
+    },
+    Empty,
+}
+
+impl Tab {
+    fn name(&self, path: Option<&Path>) -> String {
+        match (self, path) {
+            (Tab::Empty, _) => "dummy".to_string(),
+            (Tab::FileChooser { .. }, _) => "choose a file".to_string(),
+            (Tab::LogViewer(_), Some(path)) => format!("logs of {}", path.display()),
+            (Tab::LogViewer(_), None) => "logs".to_string(),
+            (Tab::CreateFilter { .. }, _) => "create filter".to_string(),
+        }
+    }
+}
+
+fn initialize_filter(
+    lv: &mut LogViewer,
+    file: &mut LogfileReader,
+    kind: Option<FilterKind>,
+) -> WipFilter {
+    let matcher = if lv.footer_selected {
+        let footer_fields = lv.footer_fields(file);
+        let (key, value) = footer_fields
+            .get(lv.footer_list.selected.unwrap_or(0))
+            .map_or((None, None), |(k, v)| (Some(k), Some(v)));
+        Some(WipMatcher::Field {
+            name: key.cloned(),
+            value: value.cloned(),
+        })
+    } else {
+        Some(WipMatcher::Specific {
+            path: Some(lv.path().clone()),
+        })
+    };
+
+    WipFilter {
+        matcher,
+        kind,
+        selection: filter::FilterSelection::Kind,
+    }
+}
+
+struct App {
+    tabs: Vec<Tab>,
+    logs_dir: PathBuf,
+    current_file: Option<LogfileReader>,
+    theme: Theme,
+}
+
+impl App {
+    fn new(logs_dir: PathBuf, theme: Theme) -> Self {
+        let mut res = Self {
+            tabs: Vec::new(),
+            current_file: None,
+            logs_dir,
+            theme,
+        };
+        res.replace_tab(res.choose_file());
+        res
+    }
+
+    fn current_file_path(&self) -> Option<PathBuf> {
+        self.current_file.as_ref().map(|i| i.path.to_path_buf())
+    }
+
+    fn replace_tab(&mut self, tab: Tab) {
+        if let Some(last) = self.tabs.last_mut() {
+            *last = tab;
+        } else {
+            self.tabs = vec![tab];
+        }
+    }
+
+    fn push_tab(&mut self, tab: Tab) {
+        self.tabs.push(tab);
+    }
+
+    fn pop_tab(&mut self) {
+        let _ = self.tabs.pop();
+    }
+
+    fn choose_file(&self) -> Tab {
+        fn init(logs_dir: &Path) -> io::Result<Vec<DirEntry>> {
+            let mut files = Vec::new();
+
+            for file in fs::read_dir(logs_dir)? {
+                let file = file?;
+                files.push(file);
+            }
+
+            Ok(files)
+        }
+
+        match init(&self.logs_dir) {
+            Ok(files) => Tab::FileChooser {
+                files,
+                state: ListState::default(),
+                last_height: 0,
+            },
+            Err(_) => Tab::Empty,
+        }
+    }
+
+    fn current_tab(&mut self) -> &mut Tab {
+        if self.tabs.is_empty() {
+            self.tabs.push(Tab::Empty);
+        }
+
+        self.tabs.last_mut().unwrap()
+    }
+
+    fn run(mut self, mut terminal: DefaultTerminal) -> io::Result<()> {
+        loop {
+            terminal.draw(|frame| frame.render_widget(&mut self, frame.area()))?;
+
+            if let Event::Key(key) = event::read()? {
+                // to initialize, but we then do get manually for borrow reasons
+                self.current_tab();
+                let num_tabs = self.tabs.len();
+                match (key.code, self.tabs.last_mut().unwrap()) {
+                    (KeyCode::Char('q'), _) => return Ok(()),
+                    (KeyCode::Char('c'), _) if key.modifiers.contains(KeyModifiers::CONTROL) => {
+                        return Ok(());
+                    }
+                    (KeyCode::Esc, _) if num_tabs > 1 => {
+                        self.pop_tab();
+                    }
+                    (KeyCode::Char('j') | KeyCode::Down, tab) => match tab {
+                        Tab::FileChooser { state, .. } => state.select_next(),
+                        Tab::LogViewer(lv) => lv.next(),
+                        Tab::Empty => {}
+                        Tab::CreateFilter { filter } => {
+                            filter.selection.next();
+                        }
+                    },
+                    (KeyCode::Char('k') | KeyCode::Up, tab) => match tab {
+                        Tab::FileChooser { state, .. } => state.select_previous(),
+                        Tab::LogViewer(lv) => {
+                            lv.prev();
+                        }
+                        Tab::Empty => {}
+                        Tab::CreateFilter { filter } => {
+                            filter.selection.prev();
+                        }
+                    },
+                    (KeyCode::PageDown, tab) => match tab {
+                        Tab::FileChooser {
+                            state, last_height, ..
+                        } => state.scroll_down_by(*last_height as u16),
+                        Tab::LogViewer(lv) => {
+                            lv.page_down();
+                        }
+                        Tab::Empty => {}
+                        Tab::CreateFilter { .. } => {}
+                    },
+                    (KeyCode::PageUp, tab) => match tab {
+                        Tab::FileChooser {
+                            state, last_height, ..
+                        } => state.scroll_up_by(*last_height as u16),
+                        Tab::LogViewer(lv) => {
+                            lv.page_up();
+                        }
+                        Tab::Empty => {}
+                        Tab::CreateFilter { .. } => {}
+                    },
+                    (KeyCode::Char('G') | KeyCode::Home, tab) => match tab {
+                        Tab::FileChooser { state, .. } => state.select_first(),
+                        Tab::LogViewer(lv) => {
+                            lv.home();
+                        }
+                        Tab::Empty => {}
+                        Tab::CreateFilter { .. } => {}
+                    },
+                    (KeyCode::Char('g') | KeyCode::End, tab) => match tab {
+                        Tab::FileChooser { state, .. } => state.select_last(),
+                        Tab::LogViewer(lv) => {}
+                        Tab::Empty => {}
+                        Tab::CreateFilter { .. } => {}
+                    },
+                    (KeyCode::Backspace | KeyCode::Left | KeyCode::Esc, Tab::LogViewer(lv)) => {
+                        lv.back();
+                    }
+                    (KeyCode::Backspace, Tab::CreateFilter { filter }) => {
+                        filter.clear();
+                    }
+                    (KeyCode::Right, Tab::CreateFilter { filter }) => {
+                        filter.right();
+                    }
+                    (KeyCode::Left, Tab::CreateFilter { filter }) => {
+                        filter.left();
+                    }
+                    (KeyCode::Right, Tab::LogViewer(lv)) => {
+                        if let Some(file) = &mut self.current_file {
+                            lv.enter(file)
+                        }
+                    }
+                    (KeyCode::Tab, Tab::LogViewer(lv)) => {
+                        lv.switch_focus();
+                    }
+                    (KeyCode::Char('r'), Tab::LogViewer(lv)) => {
+                        if let Some(file) = &mut self.current_file {
+                            let filter = initialize_filter(lv, file, Some(FilterKind::Remove));
+                            self.push_tab(Tab::CreateFilter { filter });
+                        }
+                    }
+                    (KeyCode::Char('i'), Tab::LogViewer(lv)) => {
+                        if let Some(file) = &mut self.current_file {
+                            let filter = initialize_filter(lv, file, Some(FilterKind::Inline));
+                            self.push_tab(Tab::CreateFilter { filter });
+                        }
+                    }
+                    (KeyCode::Enter, tab) => match tab {
+                        Tab::FileChooser { files, state, .. } => {
+                            if let Some(selected) = state.selected()
+                                && let Some(selected) = files.get(selected)
+                            {
+                                match LogfileReader::new(&selected.path()) {
+                                    Ok(i) => {
+                                        self.current_file = Some(i);
+                                        self.replace_tab(Tab::LogViewer(LogViewer::new()));
+                                    }
+                                    Err(e) => {
+                                        panic!()
+                                    }
+                                }
+                            }
+                        }
+                        Tab::LogViewer(lv) => {
+                            if let Some(file) = &mut self.current_file {
+                                if lv.footer_selected {
+                                    let filter = initialize_filter(lv, file, None);
+                                    self.push_tab(Tab::CreateFilter { filter });
+                                } else {
+                                    lv.enter(file)
+                                }
+                            }
+                        }
+                        Tab::Empty => {}
+                        Tab::CreateFilter { filter } => {
+                            if let FilterSelection::Confirm = filter.selection
+                                && let Some(file) = &mut self.current_file
+                            {
+                                if let Some(filter) = filter.validate() {
+                                    file.add_filter(filter);
+                                    self.pop_tab();
+
+                                    if let Tab::LogViewer(lv) = self.current_tab() {
+                                        lv.footer_selected = false;
+                                    }
+                                }
+                            } else {
+                                filter.selection.next();
+                            }
+                        }
+                    },
+                    _ => {}
+                }
+            }
+        }
+    }
+}
+
+impl Widget for &mut App {
+    fn render(self, area: Rect, buf: &mut Buffer)
+    where
+        Self: Sized,
+    {
+        let palette = self.theme.palette();
+        let default = Style::new().fg(palette.fg).bg(palette.bg);
+        let highlighted = Style::new().fg(palette.accent).bg(palette.selection);
+        let border = Style::new().fg(palette.fg).bg(palette.bg);
+        let border_selected = Style::new().fg(palette.secondary).bg(palette.bg);
+
+        let [header_area, main_area, footer_area] = Layout::vertical([
+            Constraint::Length(2),
+            Constraint::Fill(1),
+            Constraint::Ratio(1, 4),
+        ])
+        .areas(area);
+
+        let [_, popup_area, _] = Layout::vertical([
+            Constraint::Fill(1),
+            Constraint::Min(40),
+            Constraint::Fill(1),
+        ])
+        .areas(area);
+        let [_, popup_area, _] = Layout::horizontal([
+            Constraint::Fill(1),
+            Constraint::Min(40),
+            Constraint::Fill(1),
+        ])
+        .areas(popup_area);
+
+        let (footer_focused, header_focused) = match self.current_tab() {
+            Tab::FileChooser { .. } => (false, true),
+            Tab::LogViewer(lv) => (lv.footer_selected, !lv.footer_selected),
+            Tab::Empty => (false, false),
+            Tab::CreateFilter { .. } => (false, false),
+        };
+
+        let main_area = {
+            let block = Block::bordered()
+                .style(default)
+                .border_style(if header_focused {
+                    border_selected
+                } else {
+                    border
+                });
+            let inner = block.inner(main_area);
+            block.render(main_area, buf);
+            inner
+        };
+
+        let footer_area = {
+            let block = Block::bordered()
+                .style(default)
+                .border_style(if footer_focused {
+                    border_selected
+                } else {
+                    border
+                });
+            let inner = block.inner(footer_area);
+            block.render(footer_area, buf);
+            inner
+        };
+
+        let [left, middle, right] = Layout::horizontal([
+            Constraint::Ratio(1, 3),
+            Constraint::Ratio(1, 3),
+            Constraint::Fill(1),
+        ])
+        .areas(header_area);
+
+        let current_file_path = self.current_file_path();
+        let breadcrumbs = self.tabs[..self.tabs.len() - 1]
+            .iter()
+            .map(|i| i.name(current_file_path.as_deref()))
+            .collect::<Vec<_>>()
+            .join("►");
+        Paragraph::new(breadcrumbs)
+            .wrap(Wrap { trim: false })
+            .render(left, buf);
+
+        Paragraph::new(self.current_tab().name(current_file_path.as_deref()))
+            .alignment(HorizontalAlignment::Center)
+            .wrap(Wrap { trim: false })
+            .render(middle, buf);
+
+        for tab in &mut self.tabs {
+            match tab {
+                Tab::FileChooser {
+                    files,
+                    state,
+                    last_height,
+                } => {
+                    let list = List::new(files.iter().map(|file| {
+                        ListItem::new(file.file_name().to_string_lossy().into_owned())
+                    }))
+                    .style(default)
+                    .highlight_style(highlighted);
+
+                    *last_height = main_area.height as usize;
+
+                    StatefulWidget::render(list, main_area, buf, state);
+                }
+                Tab::LogViewer(lv) => {
+                    let Some(file) = &mut self.current_file else {
+                        continue;
+                    };
+
+                    lv.update_num_items(main_area.height as usize);
+
+                    let (items, start, selected) = lv
+                        .items(file, main_area.height as usize)
+                        .unwrap_or_else(|| (Vec::new(), 0, 0));
+
+                    let list = List::new(items.into_iter().enumerate().map(|(idx, i)| {
+                        let line = i.line_text(false);
+
+                        let mut list_item = ListItem::new(line);
+
+                        if idx + start == selected {
+                            list_item = list_item.style(highlighted);
+                        }
+
+                        list_item
+                    }));
+                    Widget::render(list, main_area, buf);
+
+                    let items = lv.footer_fields(file);
+                    let width = 20;
+                    let builder = ListBuilder::new(|cx| {
+                        let Some((k, v)) = &items.get(cx.index) else {
+                            return (Paragraph::new(""), 1);
+                        };
+                        let contents = serde_json::to_string_pretty(&v)
+                            .unwrap_or(String::new())
+                            .replace("\n", "\n{:width$}");
+
+                        let mut res = Paragraph::new(format!("{k:width$} {contents}"))
+                            .wrap(Wrap { trim: false });
+
+                        if cx.is_selected {
+                            res = res.style(highlighted);
+                        }
+
+                        let height = res.line_count(footer_area.width) as u16;
+                        (res, height)
+                    });
+
+                    let list = ListView::new(builder, items.len());
+                    StatefulWidget::render(list, footer_area, buf, &mut lv.footer_list);
+                }
+                Tab::Empty => {}
+                Tab::CreateFilter { filter } => {
+                    Clear.render(popup_area, buf);
+                    let popup_area = {
+                        let block = Block::bordered()
+                            .title_top("create filter")
+                            .style(default)
+                            .padding(Padding::symmetric(3, 1))
+                            .border_style(border_selected);
+                        let inner = block.inner(popup_area);
+                        block.render(popup_area, buf);
+                        inner
+                    };
+
+                    let [kind, matcher_kind, matcher_area, confirm] = Layout::vertical([
+                        Constraint::Length(5),
+                        Constraint::Length(5),
+                        Constraint::Fill(1),
+                        Constraint::Length(1),
+                    ])
+                    .areas(popup_area);
+
+                    let text = match &filter.kind {
+                        None => "<unset>",
+                        Some(FilterKind::Inline) => "inline items",
+                        Some(FilterKind::Remove) => "remove item and sub-items",
+                    };
+                    Paragraph::new(format!("⏴ {text} ⏵"))
+                        .centered()
+                        .style(
+                            if matches!(filter.selection, filter::FilterSelection::Kind) {
+                                highlighted
+                            } else {
+                                default
+                            },
+                        )
+                        .block(
+                            Block::bordered()
+                                .title_top("transformation")
+                                .padding(Padding::uniform(1)),
+                        )
+                        .render(kind, buf);
+
+                    let text = match filter.matcher.as_ref() {
+                        None => "<unset>",
+                        Some(WipMatcher::Field { .. }) => "all logs where field matches",
+                        Some(WipMatcher::Specific { .. }) => "this specific log",
+                    };
+                    Paragraph::new(format!("⏴ {text} ⏵"))
+                        .centered()
+                        .style(
+                            if matches!(filter.selection, filter::FilterSelection::MatcherKind) {
+                                highlighted
+                            } else {
+                                default
+                            },
+                        )
+                        .block(
+                            Block::bordered()
+                                .title_top("matcher")
+                                .padding(Padding::uniform(1)),
+                        )
+                        .render(matcher_kind, buf);
+
+                    match &filter.matcher {
+                        Some(WipMatcher::Field { name, value }) => {
+                            let [field_area, value_area, _] = Layout::vertical([
+                                Constraint::Length(5),
+                                Constraint::Length(5),
+                                Constraint::Fill(1),
+                            ])
+                            .areas(matcher_area);
+
+                            Paragraph::new(format!("{}", name.clone().unwrap_or_default()))
+                                .centered()
+                                .style(
+                                    if matches!(filter.selection, filter::FilterSelection::Matcher)
+                                    {
+                                        highlighted
+                                    } else {
+                                        default
+                                    },
+                                )
+                                .block(
+                                    Block::bordered()
+                                        .title_top("field name")
+                                        .padding(Padding::uniform(1)),
+                                )
+                                .render(field_area, buf);
+
+                            Paragraph::new(format!("{}", value.clone().unwrap_or_default()))
+                                .centered()
+                                .style(
+                                    if matches!(filter.selection, filter::FilterSelection::Matcher)
+                                    {
+                                        highlighted
+                                    } else {
+                                        default
+                                    },
+                                )
+                                .block(
+                                    Block::bordered()
+                                        .title_top("value")
+                                        .padding(Padding::uniform(1)),
+                                )
+                                .render(value_area, buf);
+                        }
+                        Some(WipMatcher::Specific { .. }) => {}
+                        None => {}
+                    }
+
+                    Paragraph::new("confirm")
+                        .centered()
+                        .style(
+                            if matches!(filter.selection, filter::FilterSelection::Confirm) {
+                                highlighted
+                            } else {
+                                default
+                            },
+                        )
+                        .render(confirm, buf);
+                }
+            }
+        }
+    }
+}
diff --git a/src/tui/model.rs b/src/tui/model.rs
new file mode 100644
index 0000000..f4fdd84
--- /dev/null
+++ b/src/tui/model.rs
@@ -0,0 +1,134 @@
+use std::{collections::BTreeMap, rc::Rc, sync::OnceLock};
+
+use jiff::Timestamp;
+use ratatui::text::Line;
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug)]
+pub enum Level {
+    #[serde(rename = "TRACE")]
+    Trace,
+    #[serde(rename = "DEBUG")]
+    Debug,
+    #[serde(rename = "INFO")]
+    Info,
+    #[serde(rename = "Warn")]
+    Warn,
+    #[serde(rename = "Error")]
+    Error,
+}
+
+#[derive(Debug)]
+pub enum LogEntry {
+    Single {
+        raw: RawLogEntry,
+    },
+    Sub {
+        enter: RawLogEntry,
+        sub_entries: Vec<Rc<LogEntry>>,
+        exit: RawLogEntry,
+
+        count_sub: OnceLock<usize>,
+    },
+}
+
+impl LogEntry {
+    pub fn get(&self, index: usize) -> Option<Rc<LogEntry>> {
+        match self {
+            LogEntry::Single { .. } => None,
+            LogEntry::Sub { sub_entries, .. } => sub_entries.get(index).cloned(),
+        }
+    }
+
+    pub fn all_fields(&self) -> LogFields {
+        match self {
+            LogEntry::Single { raw } => raw.all_fields(),
+            LogEntry::Sub { enter, exit, .. } => enter.all_fields().merge(&exit.all_fields()),
+        }
+    }
+
+    pub fn count(&self) -> usize {
+        match self {
+            LogEntry::Single { .. } => 1,
+            LogEntry::Sub {
+                sub_entries,
+                count_sub,
+                ..
+            } => {
+                *count_sub.get_or_init(|| sub_entries.iter().map(|i| i.count()).sum::<usize>() + 1)
+            }
+        }
+    }
+
+    pub fn line_text(&self, accessed: bool) -> Line<'static> {
+        const NO_MESSAGE: &str = "<no message>";
+        match self {
+            LogEntry::Single { raw } => {
+                format!("         ┃{}", raw.fields.message().unwrap_or(NO_MESSAGE)).into()
+            }
+            LogEntry::Sub {
+                enter, sub_entries, ..
+            } => {
+                if let Some(val) = enter.all_fields().fields.get("name")
+                    && let Some(s) = val.as_str()
+                {
+                    Line::from(format!(
+                        "{:3}⭣{:3}⇊ ┃↪ {s}",
+                        sub_entries.len(),
+                        self.count().wrapping_sub(1)
+                    ))
+                } else {
+                    format!(
+                        "              ┃{}",
+                        enter.fields.message().unwrap_or(NO_MESSAGE)
+                    )
+                    .into()
+                }
+            }
+        }
+    }
+}
+
+#[derive(Deserialize, Debug, Clone)]
+pub struct LogFields {
+    #[serde(flatten)]
+    pub fields: BTreeMap<String, serde_json::Value>,
+}
+
+impl LogFields {
+    pub fn message(&self) -> Option<&str> {
+        self.fields.get("message").and_then(|i| i.as_str())
+    }
+
+    pub fn merge(&self, other: &Self) -> Self {
+        Self {
+            fields: self
+                .fields
+                .iter()
+                .chain(other.fields.iter())
+                .map(|(k, v)| (k.clone(), v.clone()))
+                .collect(),
+        }
+    }
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RawLogEntry {
+    pub timestamp: Timestamp,
+    pub level: Level,
+    pub filename: String,
+    pub line_number: usize,
+    pub fields: LogFields,
+    #[serde(default)]
+    pub spans: Vec<LogFields>,
+}
+
+impl RawLogEntry {
+    pub fn all_fields(&self) -> LogFields {
+        let mut res = self.fields.clone();
+        for i in &self.spans {
+            res = res.merge(i);
+        }
+        res
+    }
+}
diff --git a/src/tui/reader.rs b/src/tui/reader.rs
new file mode 100644
index 0000000..6f4796d
--- /dev/null
+++ b/src/tui/reader.rs
@@ -0,0 +1,163 @@
+use std::{
+    fs::File,
+    io::{self, BufRead, BufReader},
+    mem,
+    path::{Path, PathBuf},
+    rc::Rc,
+    sync::OnceLock,
+};
+
+use crate::tui::{
+    filter::{Filter, FilterKind},
+    model::{LogEntry, RawLogEntry},
+};
+
+pub struct LogfileReader {
+    pub path: PathBuf,
+    file: BufReader<File>,
+
+    entries: Vec<Rc<LogEntry>>,
+    filters: Vec<Rc<Filter>>,
+}
+
+impl LogfileReader {
+    pub fn new(p: &Path) -> io::Result<Self> {
+        Ok(Self {
+            file: BufReader::new(File::open(p)?),
+            path: p.to_path_buf(),
+            entries: Vec::new(),
+            filters: Vec::new(),
+        })
+    }
+
+    pub fn add_filter(&mut self, filter: Filter) {
+        self.filters.push(Rc::new(filter));
+    }
+
+    fn next_line(&mut self) -> Option<String> {
+        let mut res = String::new();
+        match self.file.read_line(&mut res) {
+            Err(e) => {
+                eprintln!("error: {e:?}");
+                None
+            }
+            Ok(0) => None,
+            Ok(_) => Some(res),
+        }
+    }
+
+    fn next_raw_entry(&mut self) -> Option<RawLogEntry> {
+        let line = self.next_line()?;
+        match serde_json::from_str(&line) {
+            Ok(i) => Some(i),
+            Err(e) => {
+                eprintln!("deserializing: {e:?} in {line}");
+                None
+            }
+        }
+    }
+
+    fn next_entry(&mut self) -> Option<Rc<LogEntry>> {
+        let mut stack = Vec::<(RawLogEntry, Vec<Rc<LogEntry>>)>::new();
+        let mut curr = Vec::<Rc<LogEntry>>::new();
+
+        loop {
+            let entry = self.next_raw_entry()?;
+
+            let new_entry = Rc::new(match entry.fields.message() {
+                Some("enter") => {
+                    stack.push((entry, mem::take(&mut curr)));
+                    continue;
+                }
+                Some("exit") => {
+                    // TODO: does it match?
+                    let Some((enter, prev)) = stack.pop() else {
+                        panic!("exit before entry");
+                    };
+                    let sub_entries = mem::replace(&mut curr, prev);
+                    LogEntry::Sub {
+                        enter: enter,
+                        sub_entries,
+                        exit: entry,
+                        count_sub: OnceLock::new(),
+                    }
+                }
+                _ => LogEntry::Single { raw: entry },
+            });
+
+            if stack.is_empty() {
+                return Some(new_entry);
+            } else {
+                curr.push(new_entry);
+            }
+        }
+    }
+
+    pub fn iter_from(&mut self, start: usize) -> FilterAdapter<EntryIterator<'_>> {
+        FilterAdapter {
+            filters: self.filters.clone(),
+            inner: EntryIterator {
+                curr: start,
+                reader: self,
+            },
+        }
+    }
+
+    fn add_next_entry(&mut self) -> Option<()> {
+        let entry = self.next_entry()?;
+        self.entries.push(entry);
+        Some(())
+    }
+}
+
+pub struct EntryIterator<'a> {
+    curr: usize,
+    reader: &'a mut LogfileReader,
+}
+
+impl<'a> Iterator for EntryIterator<'a> {
+    type Item = Rc<LogEntry>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        while self.reader.entries.len() <= self.curr {
+            self.reader.add_next_entry()?;
+        }
+
+        let res = Rc::clone(&self.reader.entries[self.curr]);
+        self.curr += 1;
+        Some(res)
+    }
+}
+
+pub struct FilterAdapter<I> {
+    filters: Vec<Rc<Filter>>,
+    inner: I,
+}
+
+impl<I: IntoIterator> FilterAdapter<I> {
+    pub fn new(file: &LogfileReader, inner: I) -> FilterAdapter<I::IntoIter> {
+        Self {
+            filters: file.filters.clone(),
+            inner: inner.into_iter(),
+        }
+    }
+}
+
+impl<I: Iterator> Iterator for FilterAdapter<I> {
+    type Item = I::Item;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        'next_entry: loop {
+            let res = self.inner.next()?;
+
+            for filter in &self.reader.filters {
+                if let FilterKind::Remove = filter.kind
+                    && filter.matcher.matches(&res)
+                {
+                    continue 'next_entry;
+                }
+            }
+            break Some(res);
+        }
+    }
+}