dv-review 0.95.18

A terminal diff viewer for reviewing GitHub PRs: Helix keys, rust-analyzer, inline review comments, and Claude Code reviews
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//! Key handling: normal mode, pending (multi-key) commands, pickers, labels, and the help search.
use super::*;

pub(super) const HELP: &str = "
MOVE
  h j k l, arrows      move (counts: 5j)
  w b e  W B E         word motions (select)
  gh gl gs             line start / end / first non-blank
  f t F T <c>          find char
  gw                   jump labels
  mm                   matching bracket
  gg ge                top / end (in the comments pane: its first / last)
  Ctrl-d Ctrl-u        half page down / up
  Ctrl-e Ctrl-y        scroll 5 lines
  zz zt zb             cursor line to center / top / bottom
  Ctrl-o               jump back

DIFF
  ]g [g                next / prev hunk (change)
  ]f [f, Space f       next / prev file, file picker
  Space C              commit picker: one commit's diff, or all of them
  Space N              Claude drafts a new PR from what's selected (or the line): your editor
                       first, on what it should do; dv list's drafts tab has it
  ]c [c                next / prev comment thread
  ]u [u                next / prev unresolved one (wraps around)
  ]a [a                next / prev Claude comment (wraps around)
  ]p [p                next / prev comment of your pending review (wraps around)
  /  n N  *            search, next / prev match, search selection

SELECT & COPY
  x                    select line (repeat to extend)
  v  ;  Esc            select mode / collapse / exit select mode
  y  (or Space y)      copy text
  Y                    copy as patch
  Space c              copy: a link's URL, file:line, or a comment's / the PR's link

VIEW
  + =  -               hunk context +10 / -10 lines
  Z                    whole file
  Tab                  fold file / PR info / thread
  gn  gp               comments pane: next / previous tab (comments, Claude's, the PR's)
  Shift-Tab            fold / unfold all files
  Ctrl-w v             toggle split (side-by-side) view
  Ctrl-w n             relative line numbers on / off (kept for next time)
  Ctrl-w r             long code lines wrap / scroll sideways (kept for next time)
  Ctrl-w e             the contents on the left (description, messages, files), on / off
                       and the PR's commits under it: Enter shows one, v … Enter a range,
                       m its whole message, a asks Claude about it (or for a change),
                       f folds what isn't committed into it;
                       Ctrl-w j / Ctrl-w k (or Tab there) go to the commits / the files
  Ctrl-w h  Ctrl-w l   pane left / right: files, old / new side, comments (or Ctrl-h Ctrl-l)
  Ctrl-w c             show / hide the comments pane (╎ ● mark their lines)
  Ctrl-w f             comments pane: a column beside the code / floating over it
  Ctrl-w ,  Ctrl-w .   the pane you're in narrower / wider (Ctrl-w = usual width)
  Ctrl-w q             hide the pane you're in (files' list or comments)
  Ctrl-w o             maximize the pane you're in, till you leave it (again: as it was)
  Enter                code: open in hx; text: its link, file:line, or where the name
                       under it is defined (Ctrl-o comes back)

RUST-ANALYZER
  gd gr gy gi          definition / references / type / impl (on a name in a comment too)
  Space k              hover; on an issue/PR link: preview it

ON SELECTED LINES
  c                    comment, in your pending review (C: post it now)
  s                    suggest a change, in your pending review
  a                    a comment for Claude: an answer, a suggestion, or the change you want
                       (it acts right away; not on GitHub); on a
                       replacement's description or closing note: ask Claude to redraft it

ON A REVIEW THREAD
  r                    reply, in your pending review (C: post it now)
  Space r              resolve / unresolve
  Space =              react (👍 🎉 …), or take your reaction back (PR comments too)
  Space l              the PR's labels, assignees, reviewers: add or remove (request reviews)
  Space e  Space d     edit / delete your comment (delete asks first)

ON CLAUDE'S COMMENT
  r                    reply to Claude, saying what you want (it acts right away, in the
                       background)
  c                    copy it into your pending review (C: post it now)
  Space r  Space d     resolve (Claude skips it) / dismiss

ON PR TEXT
  c                    quote it in your review summary (S starts from it)
  C                    quote it in a new conversation comment

ON CLAUDE'S REVIEW (its summary)
  c                    add it to your review summary (S starts from it)
  C                    post it now, as your PR comment

REVIEW
  S                    submit (comment / approve / request changes), close the PR, or discard
  Space g              git: show only what isn't committed (Claude's changes), commit, amend
                       it into the commits it belongs in, push, update the checkout, rebase
                       onto the base (Claude resolves conflicts)
  Space p  Space t     pick from your pending comments (Ctrl-d deletes) / all threads
  Space v              mark the file viewed (folds it, moves on)
  Space a              ask Claude Code to review, answer your replies, or make the changes
                       (or check on its run now, or stop one that's stuck)
  Space A              pick from Claude's comments ([waiting]: its turn, [answered]: yours)
  ]n [n  Space n       next / prev [new] thread (ones you haven't seen) / pick from them

GENERAL
  ?                    this help (/ to search it)
  R                    refresh (git diff + GitHub)
  Space m              messages so far, in full (the status bar cuts long ones)
  Space s              a shell in the checkout's directory (zellij: a floating pane)
  Space o              the PR's whole activity, or its latest (beside the description)
  mouse                wheel scrolls (Shift or sideways: the code under it), click moves (or
                       folds, on an arrow), drag selects
  q, Ctrl-c            quit
";

impl App {
    pub(super) fn label_key(&mut self, k: KeyEvent) {
        // (Not a label's letter, a Ctrl or Alt key's included: they go.)
        let KeyCode::Char(c) = k.code else {
            self.labels.clear();
            return;
        };
        if k.modifiers.intersects(KeyModifiers::CONTROL | KeyModifiers::ALT) {
            self.labels.clear();
            return;
        }
        match self.label_first {
            None if self.labels.iter().any(|l| l.2[0] == c) => self.label_first = Some(c),
            Some(f) => {
                if let Some(&(s, e, _)) = self.labels.iter().find(|l| l.2 == [f, c]) {
                    self.sel(s, e);
                }
                self.labels.clear();
            }
            None => self.labels.clear(),
        }
    }

    /// Rebuild the help overlay for its current search.
    pub(super) fn refresh_help(&mut self) {
        let Some((q, typing)) = self.help.clone() else { return };
        // (Help takes two columns when they fit, else one of at most 97.)
        let cw = super::render::popup_text_w(self.width);
        let title = match (typing, q.is_empty()) {
            (true, _) => format!(" keys /{q}▏ Enter keep · Esc clear "),
            (false, false) => format!(" keys /{q} · / edit · j/k scroll · other keys close "),
            (false, true) => " keys · / search · j/k scroll · other keys close ".into(),
        };
        self.popup = Some((title, self.help_lines(cw, &q), 0));
    }

    pub(super) fn key(&mut self, k: KeyEvent) {
        self.msg.clear();
        self.pin_half();
        // What's typed into (help's search, a picker, the prompt): Ctrl-c closes it as Esc does,
        // and a Ctrl or Alt key's char isn't typed (`typed`).
        let typed = typed(&k);
        let k = match k.code {
            KeyCode::Char('c') if !typed && (self.help.is_some() || self.picker.is_some() || self.prompt.is_some()) => KeyEvent::new(KeyCode::Esc, KeyModifiers::NONE),
            _ => k,
        };
        if let Some((q, typing)) = &mut self.help {
            let handled = match (*typing, k.code) {
                (true, KeyCode::Char(c)) if typed => {
                    q.push(c);
                    true
                }
                (true, KeyCode::Backspace) => {
                    q.pop();
                    true
                }
                (true, KeyCode::Enter) => {
                    *typing = false;
                    true
                }
                (true, KeyCode::Esc) => {
                    q.clear();
                    *typing = false;
                    true
                }
                (true, _) => true,
                (false, KeyCode::Char('/')) => {
                    *typing = true;
                    true
                }
                _ => false, // j/k scroll, anything else closes: the popup keys below
            };
            if handled {
                return self.refresh_help();
            }
        }
        if let Some((_, _, scroll)) = &mut self.popup {
            match k.code {
                KeyCode::Char('j') | KeyCode::Down => *scroll += 1,
                KeyCode::Char('k') | KeyCode::Up => *scroll = scroll.saturating_sub(1),
                _ => (self.popup, self.help) = (None, None),
            }
            return;
        }
        if !self.labels.is_empty() {
            return self.label_key(k);
        }
        if self.picker.is_some() {
            return self.picker_key(k);
        }
        if let Some(q) = &mut self.prompt {
            match k.code {
                KeyCode::Esc => self.prompt = None,
                KeyCode::Enter => {
                    // (Nothing typed: the last search again, as Helix's.)
                    let q = self.prompt.take().unwrap_or_default();
                    if !q.is_empty() {
                        self.search = q;
                    }
                    self.find(true);
                }
                KeyCode::Backspace if q.is_empty() => self.prompt = None,
                KeyCode::Backspace => _ = q.pop(),
                KeyCode::Char(c) if typed => q.push(c),
                _ => {}
            }
            return;
        }
        if self.files_focus && self.pending.is_none() && self.files_key(k) {
            return;
        }
        let ch = |c| KeyEvent::new(KeyCode::Char(c), KeyModifiers::NONE);
        // A key that isn't a char (Enter, Tab, an arrow): a prefix waiting goes, as Helix's
        // (but Ctrl-w's: its window keys take arrows); a count too, but before an arrow (a move).
        let arrow = matches!(k.code, KeyCode::Left | KeyCode::Down | KeyCode::Up | KeyCode::Right);
        if !matches!(k.code, KeyCode::Char(_)) {
            if !(arrow && self.pending == Some(CTRL_W)) {
                self.pending = None;
            }
            if !arrow {
                self.count = 0;
            }
        }
        let c = match k.code {
            KeyCode::Char(c) => c,
            KeyCode::Esc => {
                (self.pending, self.count, self.select) = (None, 0, false);
                return;
            }
            KeyCode::Enter if self.rows[self.head.row].info == Some(MORE_CONVERSATION) => return self.toggle_conversation(),
            // On code: the file in your editor, there. Anywhere else (a comment, the PR's text,
            // a link): what's under the cursor (`open_link`: a link, a file:line, a name).
            KeyCode::Enter => {
                let row = &self.rows[self.head.row];
                let code = row.file < self.files.len() && row.thread.is_none();
                match code && self.link_at_cursor().is_none() {
                    true => self.action = self.open_target().map(Action::Open),
                    false => self.open_link(),
                }
                return;
            }
            // Many terminals send Ctrl-h as Backspace.
            KeyCode::Backspace => return self.side(false),
            // On a comment hidden on GitHub: it shown (or hidden again).
            KeyCode::Tab if self.toggle_hidden() => return,
            KeyCode::Tab if self.toggle_talk() => return,
            KeyCode::Tab if self.on_folded_file_comment() => return self.toggle_collapse(),
            KeyCode::Tab if self.rows[self.head.row].thread.is_some() => return self.toggle_thread(),
            KeyCode::Tab => return self.toggle_collapse(),
            KeyCode::BackTab => return self.toggle_collapse_all(),
            KeyCode::Left => return self.key(ch('h')),
            KeyCode::Down => return self.key(ch('j')),
            KeyCode::Up => return self.key(ch('k')),
            KeyCode::Right => return self.key(ch('l')),
            _ => return,
        };
        // What a prefix and a count come to: settled here, for every key (a Ctrl key's too).
        let pending = self.pending.take();
        if k.modifiers.intersects(KeyModifiers::CONTROL | KeyModifiers::ALT) {
            self.count = 0;
        }
        if k.modifiers.contains(KeyModifiers::CONTROL) {
            // Ctrl-w, then Ctrl-l (Helix's window keys take either): as Ctrl-w l. Another
            // prefix: called off.
            if pending == Some(CTRL_W) {
                return self.pending_key(CTRL_W, c);
            }
            let half = (self.height / 2).max(1) as isize;
            match c {
                'd' => {
                    self.top = (self.top + half as usize).min(self.drows.len() - 1);
                    self.vmove(half);
                }
                'u' => {
                    self.top = self.top.saturating_sub(half as usize);
                    self.vmove(-half);
                }
                'e' => self.scroll(5),
                'w' => self.pending = Some(CTRL_W),
                'h' => self.side(false),
                'l' => self.side(true),
                'y' => self.scroll(-5),
                'o' => {
                    if let Some((r, col)) = self.jumps.pop().and_then(|(k, col)| Some((self.find_key(k)?, col))) {
                        self.select = false;
                        self.goto(r, col);
                    }
                }
                'c' => self.quit = true,
                _ => {}
            }
            return;
        }
        if k.modifiers.contains(KeyModifiers::ALT) {
            return; // no Alt bindings (n / N repeat the search, as in Helix)
        }
        if let Some(p) = pending {
            return self.pending_key(p, c);
        }
        if let Some(d) = c.to_digit(10).filter(|&d| d > 0 || self.count > 0) {
            self.count = (self.count * 10 + d as usize).min(10_000); // (a motion repeated: not forever)
            return;
        }
        // A prefix: the count's for what follows it (`2]f`).
        if matches!(c, 'g' | ']' | '[' | ' ' | 'f' | 't' | 'F' | 'T' | 'z' | 'm') {
            return self.pending = Some(c);
        }
        let n = std::mem::take(&mut self.count).max(1);
        match c {
            'h' => self.goto(self.head.row, self.head.col.saturating_sub(n)),
            'l' => self.goto(self.head.row, self.head.col + n),
            'j' => self.vmove(n as isize),
            'k' => self.vmove(-(n as isize)),
            'w' | 'b' | 'e' | 'W' | 'B' | 'E' => (0..n).for_each(|_| self.word(c)),
            'x' => (0..n).for_each(|_| self.line_select()),
            'v' => self.select = !self.select,
            ';' => self.anchor = self.head,
            'y' => self.yank(false),
            'Y' => self.yank(true),
            '/' => self.prompt = Some(String::new()),
            'n' => (0..n).for_each(|_| self.find(true)),
            'N' => (0..n).for_each(|_| self.find(false)),
            '*' => {
                // (Its first line's text, as drawn: a search matches within a line.)
                let (s, e) = self.ordered();
                let to = if e.row == s.row { e.col + 1 } else { usize::MAX };
                self.search = self.chars(s.row).into_iter().skip(s.col).take(to.saturating_sub(s.col)).collect();
                self.msg = format!("search: {}", self.search);
            }
            '+' | '=' => self.expand(10),
            '-' => self.expand(-10),
            'Z' => self.toggle_whole(),
            '?' => {
                self.help = Some((String::new(), false));
                self.refresh_help();
            }
            'c' => self.comment_or_reply(true),
            'a' => self.start_ask_claude(),
            's' => self.start_suggest(),
            'C' => self.comment_or_reply(false),
            'r' => self.start_reply(true),
            'S' => self.review_menu(),
            'R' => self.start(Job::Refresh),
            'q' => self.quit = true,
            _ => {}
        }
    }

    /// What can follow prefix key `p`, for the which-key popup (as Helix shows): (title, keys).
    /// Kept next to `pending_key`, which they mirror.
    pub(super) fn which(p: char) -> Option<(&'static str, &'static [(&'static str, &'static str)])> {
        Some(match p {
            ' ' => ("space", &[
                ("f", "file picker"),
                ("C", "commit picker (one commit, or all)"),
                ("N", "Claude drafts a new PR from the selection"),
                ("t", "review threads (Tab: unresolved, pending, …)"),
                ("p", "… your pending comments"),
                ("A", "… Claude's comments"),
                ("n", "… new comments (not seen yet)"),
                ("a", "ask Claude: review / answer / make changes"),
                ("k", "hover / preview link"),
                ("v", "mark file viewed"),
                ("g", "git: uncommitted only / commit / push / update"),
                ("m", "messages, in full"),
                ("s", "a shell in the checkout's directory"),
                ("o", "the PR's whole activity / its latest"),
                ("r", "resolve thread"),
                ("=", "react to the comment (👍 🎉 …)"),
                ("l", "the PR's labels, assignees, reviewers"),
                ("e", "edit your comment"),
                ("d", "delete / dismiss comment"),
                ("y", "copy"),
                ("c", "copy ref (file:line / comment link)"),
            ]),
            'g' => ("goto", &[
                ("g", "top"),
                ("e", "end"),
                ("h", "line start"),
                ("l", "line end"),
                ("s", "first non-blank"),
                ("w", "jump labels"),
                ("d", "definition"),
                ("r", "references"),
                ("y", "type definition"),
                ("i", "implementations"),
                ("n", "pane: next tab (comments / PR)"),
                ("p", "pane: previous tab"),
            ]),
            'z' => ("view", &[("z", "cursor line to center"), ("t", "… to top"), ("b", "… to bottom")]),
            ']' => ("next", &[("g", "change (hunk)"), ("f", "file"), ("c", "comment thread"), ("u", "unresolved comment"), ("a", "Claude's comment"), ("p", "pending comment"), ("n", "new comment")]),
            '[' => ("previous", &[("g", "change (hunk)"), ("f", "file"), ("c", "comment thread"), ("u", "unresolved comment"), ("a", "Claude's comment"), ("p", "pending comment"), ("n", "new comment")]),
            CTRL_W => ("window", &[
                ("v", "toggle split view"),
                ("n", "relative line numbers on / off"),
                ("r", "wrap long lines / scroll sideways"),
                ("e", "the files' list on / off"),
                ("c", "show / hide the comments pane"),
                ("f", "comments pane: a column / floating over the code"),
                (",", "narrower pane (the one you're in, else comments)"),
                (".", "wider pane"),
                ("=", "the pane at its usual width"),
                ("q", "hide the pane you're in (files / comments)"),
                ("o", "maximize the pane you're in (till you leave it)"),
                ("j", "the commits (in the files' list)"),
                ("k", "the files (in the files' list)"),
                ("h", "the pane to the left"),
                ("l", "the pane to the right"),
            ]),
            'm' => ("match", &[("m", "matching bracket")]),
            _ => return None,
        })
    }

    pub(super) fn pending_key(&mut self, p: char, c: char) {
        // A count before the prefix: `]` / `[` go that many times; spent either way.
        let n = std::mem::take(&mut self.count).max(1);
        if matches!(p, ']' | '[') && n > 1 {
            // (One motion, one jump: Ctrl-o back to where it began.)
            let j = self.jumps.len();
            (0..n).for_each(|_| self.pending_key(p, c));
            return self.jumps.truncate(j + 1);
        }
        let file = |app: &App, r: usize| app.rows[r].line.kind == Kind::File;
        let so = super::render::scrolloff(self.height);
        // The window's other keys act on it as you set it, not as maximized (`Ctrl-w o`, `h` /
        // `l`: `side`): as it was first.
        if p == CTRL_W && !matches!(c, 'o' | 'h' | 'l' | 'e') && self.zoom.take().is_some() {
            self.relayout();
        }
        match (p, c) {
            // In the pane, its own top / end (the first and last comment, or the PR's text).
            // (Jumps, Ctrl-o comes back; a selection goes on, as Helix's.)
            ('g', 'g') => {
                let r = self.rows_here().first().copied().unwrap_or(self.head.row);
                self.push_jump(r, 0);
                self.goto(r, 0);
            }
            ('g', 'e') => {
                let r = self.rows_here().last().copied().unwrap_or(self.head.row);
                self.push_jump(r, 0);
                self.goto(r, 0);
            }
            ('g', 'h') => self.goto(self.head.row, 0),
            ('g', 'l') => self.goto(self.head.row, usize::MAX),
            ('m', 'm') => self.match_bracket(),
            ('g', 's') => {
                let col = self.chars(self.head.row).iter().position(|c| !c.is_whitespace()).unwrap_or(0);
                self.goto(self.head.row, col);
            }
            ('g', 'd') => self.lsp_request("textDocument/definition", Req::Goto),
            ('g', 'y') => self.lsp_request("textDocument/typeDefinition", Req::Goto),
            ('g', 'i') => self.lsp_request("textDocument/implementation", Req::Goto),
            ('g', 'r') => self.lsp_request("textDocument/references", Req::Goto),
            ('g', 'w') => self.show_labels(),
            (' ', 'k') => match self.link_at_cursor().filter(|u| gh::issue_ref(u).is_some()).map(str::to_owned) {
                Some(url) => {
                    self.start(Job::Preview(url));
                }
                None => self.lsp_request("textDocument/hover", Req::Hover),
            },
            (']', 'g') => self.next_kind(true, change_start),
            ('[', 'g') => self.next_kind(false, change_start),
            (']', 'c') => self.next_of('c', true),
            ('[', 'c') => self.next_of('c', false),
            (']', 'a') => self.next_of('a', true),
            ('[', 'a') => self.next_of('a', false),
            (']', 'n') => self.next_of('n', true),
            ('[', 'n') => self.next_of('n', false),
            (']', 'u') => self.next_of('u', true),
            ('[', 'u') => self.next_of('u', false),
            (']', 'p') => self.next_of('p', true),
            ('[', 'p') => self.next_of('p', false),
            ('z', 'z') => self.top = self.hd().saturating_sub(self.height / 2),
            ('z', 't') => self.top = self.hd().saturating_sub(so),
            ('z', 'b') => self.top = (self.hd() + so + 1).saturating_sub(self.height),
            (CTRL_W, 'v') => self.toggle_split(),
            (CTRL_W, 'c') => {
                let show = !self.margin_active;
                self.margin_pref = Some(show);
                self.save_pane("shown", show.into());
                // (PR text stays on screen, after the description.)
                if !show && self.margin_side() && !self.rows[self.head.row].attached {
                    // Off the comment, onto what it's beside (it'd show it again).
                    self.goto(self.line_beside(), 0);
                }
                self.msg = match show {
                    true => "comments shown (Ctrl-w c hides them)",
                    false => "comments hidden: their lines are marked at the code's right edge (Ctrl-w c shows them)",
                }
                .into();
            }
            ('g', 'n') | ('g', 'p') => self.cycle_bar(c == 'n'),
            (CTRL_W, 'e') => self.toggle_files(),
            (CTRL_W, 'r') => self.toggle_wrap(),
            (CTRL_W, 'n') => {
                let on = !self.settings.relative;
                self.settings.relative = on;
                self.save_pane("relative", on.into());
                self.msg = match on {
                    true => "relative line numbers (Ctrl-w n: off)",
                    false => "no relative line numbers (Ctrl-w n: on)",
                }
                .into();
            }
            (CTRL_W, 'f') => {
                let float = !self.margin_float;
                self.margin_float_pref = Some(float);
                self.save_pane("float", float.into());
                self.margin_pref = Some(true);
                self.msg = match float {
                    true => "comments pane floating over the code (Ctrl-w f: a column beside it)",
                    false => "comments pane as a column beside the code (Ctrl-w f: floating over it)",
                }
                .into();
            }
            (CTRL_W, ',') | (CTRL_W, '.') if self.files_focus => self.resize_files(if c == '.' { 4 } else { -4 }),
            (CTRL_W, '=') if self.files_focus => self.resize_files(0),
            (CTRL_W, 'q') if self.files_focus => self.toggle_files(),
            (CTRL_W, 'q') if self.margin_side() => self.pending_key(CTRL_W, 'c'),
            (CTRL_W, 'q') => self.msg = "the code stays; Ctrl-w q hides the files' list or comments pane you're in".into(),
            (CTRL_W, 'o') if self.files_focus => self.msg = "Ctrl-w o maximizes the code or the comments pane".into(),
            (CTRL_W, 'o') => {
                self.zoom = match self.zoom {
                    Some(_) => None,
                    None => Some(self.margin_side()),
                };
                self.msg = match self.zoom {
                    Some(_) => "maximized till you leave it (Ctrl-w o: as it was)",
                    None => "as it was",
                }
                .into();
            }
            (CTRL_W, ',') | (CTRL_W, '.') => {
                let w = self.margin_w as isize + if c == '.' { MARGIN_STEP } else { -MARGIN_STEP };
                let w = w.max(MARGIN_NARROW as isize) as usize;
                self.margin_w_pref = Some(w);
                self.margin_pref = Some(true);
                self.save_pane("width", w.into());
            }
            (CTRL_W, '=') => {
                self.margin_w_pref = None;
                self.save_pane("width", Value::Null);
            }
            (CTRL_W, 'j') => self.focus_list(true),
            (CTRL_W, 'k') => self.focus_list(false),
            (CTRL_W, 'h') => self.side(false),
            (CTRL_W, 'l') => self.side(true),
            (']', 'f') => self.next_kind(true, file),
            ('[', 'f') => self.next_kind(false, file),
            (' ', 'f') => {
                // What the files' list has (its sections, its files by path; not its folders).
                use super::files::Spot;
                let items = self
                    .file_entries()
                    .into_iter()
                    .filter_map(|e| match e.spot {
                        Spot::Folder => None,
                        Spot::File(i) => Some(Item::new(self.files[i].path.clone(), Target::Spot(e.spot))),
                        Spot::Section(_) => Some(Item::new(e.text, Target::Spot(e.spot))),
                    })
                    .collect();
                self.picker = Some(Picker::new(" files ", items));
            }
            (' ', 'C') => self.commit_picker(),
            (' ', 'N') => self.draft_from_selection(),
            (' ', 'y') => self.yank(false),
            (' ', 'c') => self.copy_ref(),
            (' ', 'r') => self.toggle_resolved(),
            (' ', '=' | '+') => self.start_react(),
            (' ', 'l') => match self.subject() {
                Some(_) => self.start(Job::Labels),
                None => self.msg = "no PR here".into(),
            },
            (' ', 'e') => self.start_edit(),
            (' ', 'd') => self.start_delete(),
            (' ', 't') => self.threads_picker(THREADS_ALL),
            (' ', 'p') => self.threads_picker(THREADS_PENDING),
            (' ', 'a') => self.claude_menu(),
            (' ', 'A') => self.threads_picker(THREADS_CLAUDE),
            (' ', 'n') => self.threads_picker(THREADS_NEW),
            (' ', 'v') => self.toggle_viewed(),
            (' ', 'g') => self.git_menu(),
            (' ', 'm') => self.messages(),
            (' ', 's') => self.action = Some(Action::Shell),
            (' ', 'o') => self.toggle_conversation(),
            ('f' | 't' | 'F' | 'T', c) => self.find_char(p, c),
            _ => {}
        }
    }

    /// Picker items with each word of the query in them (case-insensitive, in any order: not
    /// its letters scattered, which matched nearly anything); those with it whole first.
    pub(super) fn matches(&self) -> Vec<usize> {
        let Some(p) = &self.picker else { return vec![] };
        let q = p.query.to_lowercase();
        let text = |it: &Item| std::iter::once(&it.label).chain(&it.detail).map(|s| s.to_lowercase()).collect::<Vec<_>>().join(" ");
        let mut m: Vec<(bool, usize)> = (0..p.items.len())
            .filter_map(|i| {
                let text = text(&p.items[i]);
                q.split_whitespace().all(|w| text.contains(w)).then(|| (!text.contains(q.trim()), i))
            })
            .collect();
        m.sort();
        m.into_iter().map(|(_, i)| i).collect()
    }

    pub(super) fn picker_key(&mut self, k: KeyEvent) {
        let m = self.matches();
        let ctrl = k.modifiers.contains(KeyModifiers::CONTROL);
        let Some(p) = &mut self.picker else { return };
        // The threads picker: Tab / Shift-Tab to the next / previous filter.
        if let Some(tab) = THREAD_TABS.iter().position(|&t| t == p.title)
            && matches!(k.code, KeyCode::Tab | KeyCode::BackTab)
        {
            let n = THREAD_TABS.len();
            return self.threads_picker(if k.code == KeyCode::Tab { (tab + 1) % n } else { (tab + n - 1) % n });
        }
        // In the pending comments picker, Ctrl-d deletes the selected one (after a confirmation).
        if ctrl && k.code == KeyCode::Char('d') && p.title == THREAD_TABS[THREADS_PENDING] {
            if let Some(Target::Comment(ti, ci)) = m.get(p.sel).map(|&i| &p.items[i].target)
                && let Some(c) = self.threads.get(*ti).and_then(|t| t.comments.get(*ci)).cloned()
            {
                self.confirm_delete(c);
            }
            return;
        }
        match k.code {
            KeyCode::Esc => (self.picker, self.wanting) = (None, None),
            KeyCode::Enter => {
                let mut p = self.picker.take().unwrap();
                if let Some(&i) = m.get(p.sel) {
                    match p.items.swap_remove(i).target {
                        t if t.touches_checkout() && self.claude_busy() => self.msg = App::busy_says("change the checkout"),
                        Target::Do(a) => self.action = Some(a),
                        // (The labels picker comes back after, as it was, on the one picked:
                        // one after another.)
                        Target::Run(Job::SetField(field, name, on)) => {
                            self.fields_at = Some((p.query.clone(), field, name.clone()));
                            self.start(Job::SetField(field, name, on));
                        }
                        Target::Run(job) => self.start(job),
                        Target::Spot(s) => self.goto_spot(s),
                        Target::Loc(l) => self.jump_loc(&l),
                        Target::Discard => {
                            let n = self.pending_count();
                            let items = vec![
                                Item::new("No, keep it", Target::Nothing),
                                Item::new(format!("Yes, discard {n} pending comment(s)"), self.review.clone().map_or(Target::Nothing, |r| Target::Run(Job::Discard(r)))),
                            ];
                            self.picker = Some(Picker::new(" discard pending review? ", items));
                        }
                        Target::Comment(ti, ci) => self.goto_comment(ti, ci),
                        Target::Claude(ask) => self.pick_claude(ask),
                        Target::Want(w) => self.want(w),
                        Target::Land(ask, l) => self.land(ask, l),
                        Target::ClaudeNotes => self.edit_claude_notes(),
                        Target::ClaudeQuestion => {
                            self.bar_to(Bar::Claude); // where it's answered
                            self.action = Some(Action::AskConversation { url: ON_SUMMARY.into(), prefill: String::new(), want: "" });
                        }
                        Target::ReplaceRemote(name, close) => match crate::replace::set_remote(&name) {
                            Ok(()) => self.action = Some(Action::Publish(close)),
                            Err(e) => self.msg = format!("{e:#}"),
                        },
                        Target::ClaudeFresh => self.fresh_claude_session(),
                        Target::OpenReplacement(id) => self.hand_off = Some(HandOff::Replacement(id)),
                        Target::ClaudePane => self.show_claude_pane(),
                        Target::ClaudeOpen => self.open_claude_pane(),
                        Target::ClaudeCheck => self.check_claude(),
                        Target::ClaudeStop => self.stop_claude(),
                        Target::AmendMenu => self.amend_menu(),
                        Target::RebaseClaude => {
                            if let Err(e) = self.rebase_claude() {
                                self.msg = format!("{e:#}");
                            } else {
                                self.msg = "Claude is resolving the rebase's conflicts".into();
                            }
                        }
                        Target::RebaseAbort => self.abort_rebase(),
                        Target::Amend => self.amend_now(),
                        Target::AmendAsk => self.amend_ask(false),
                        Target::AmendAll => self.amend_ask(true),
                        Target::GitView => self.toggle_uncommitted(),
                        Target::CommitRow(r) => {
                            (self.commit_cur, self.commit_anchor) = (r, None);
                            self.pick_commits();
                        }
                        // (Refused here if it would be, not after the review's ended.)
                        Target::GitMerge => match self.pr.as_ref().map(|p| (p.number, crate::merge::waits(p.number))) {
                            Some((_, Some(why))) => self.msg = why,
                            Some((n, None)) => (self.merge, self.quit) = (Some(n), true),
                            None => {}
                        },
                        Target::GitTakeTheirs(sure) => self.take_theirs(sure),
                        Target::GitDrop(path, sure) => self.msg = self.drop_uncommitted(path, sure).unwrap_or_else(|e| format!("not dropped: {e:#}")),
                        Target::GitReady => self.mark_ready(),
                        Target::GitApproveRuns => self.approve_runs(),
                        Target::ClaudeDismissOutdated(sure) => self.dismiss_outdated(sure),
                        Target::DescApprove(sure) => self.approve_description(sure),
                        Target::DescDiscard => self.discard(&["description", "title"], "Claude's proposed description"),
                        Target::CloseDiscard => self.discard(&["closing"], "Claude's closing comment"),
                        Target::Nothing | Target::Note(_) | Target::Warn => {}
                    }
                }
            }
            KeyCode::Up => p.sel = p.sel.saturating_sub(1),
            KeyCode::Char('p') if ctrl => p.sel = p.sel.saturating_sub(1),
            KeyCode::Down | KeyCode::Tab => p.sel = (p.sel + 1).min(m.len().saturating_sub(1)),
            KeyCode::Char('n') if ctrl => p.sel = (p.sel + 1).min(m.len().saturating_sub(1)),
            KeyCode::Backspace => {
                p.query.pop();
                p.sel = 0;
            }
            KeyCode::Char(c) if typed(&k) => {
                p.query.push(c);
                p.sel = 0;
            }
            _ => {}
        }
    }
}

/// A key whose char is typed into a text input: none with Ctrl or Alt.
fn typed(k: &KeyEvent) -> bool {
    !k.modifiers.intersects(KeyModifiers::CONTROL | KeyModifiers::ALT)
}