tix-tracker 0.12.0

#[allow(clippy::wildcard_imports)]
use super::*;

impl App {
    /// Detect a concurrent write and decide what a finished round trip does
    /// (tix #1510).
    ///
    /// The comparison is on the file's **raw bytes**: anything that rewrote the
    /// file — an agent editing through MCP, another session, a watcher's repair —
    /// leaves different bytes, and at this point nothing has been written yet.
    /// Identical bytes mean the file is the one the editor was handed, so the edit
    /// is committed exactly as it was before #1510 existed.
    pub(in crate::app) fn settle_pending_edit(&mut self, pending: PendingEdit) {
        let disk_path = self.store.issues_dir.join(&pending.filename);
        let edited = match std::fs::read_to_string(&pending.temp) {
            Ok(text) => text,
            Err(e) => {
                self.status_msg = Some(format!("editor: {e}"));
                return;
            }
        };
        // A read failure counts as a change: the bytes cannot be shown to be the
        // ones the editor saw, and assuming "unchanged" would write over a file
        // this process cannot even read.
        let unchanged = std::fs::read(&disk_path)
            .map(|bytes| bytes == pending.snapshot)
            .unwrap_or(false);
        if !unchanged {
            // Nothing is written and the temp copy is deliberately kept: it *is*
            // the editor's version, and the prompt may still write it or reopen it.
            self.mode = Mode::EditConflict {
                filename: pending.filename,
                temp: pending.temp,
                disk_path,
            };
            self.status_msg =
                Some("the issue changed on disk while you were editing it".to_string());
            return;
        }
        let issue = match Issue::parse(&edited) {
            Ok(issue) => issue,
            Err(e) => {
                // The reported bug (tix #1506). The old flow returned the generic
                // `file not valid after edit` from `run_editor` and then deleted
                // the temp copy, destroying the user's work. Now the real
                // diagnostic is classified, nothing is written, the round trip
                // stays in flight, and the retained copy is kept for the repair
                // prompt to reopen.
                let filename = pending.filename.clone();
                let previous = self.previous_issue(&filename);
                let problems =
                    edit_problems::for_parse_error(&error_message(&e), &edited, previous.as_ref());
                let temp = pending.temp.clone();
                self.pending_edit = Some(pending);
                self.enter_repair(&filename, Some(temp), false, problems);
                return;
            }
        };
        let temp = pending.temp.clone();
        self.commit_edited_issue(&pending.filename, issue, "Edited", Some(temp));
    }

    /// Persist an issue an editor round trip produced and settle it (#1506/#1510).
    ///
    /// The one write both entry points and the conflict prompt's override share,
    /// so an override cannot land somewhere an ordinary save would not: it refuses
    /// a titleless issue (no slug, no stable filename), reassigns the segment when
    /// the edit changed the assignee (FR-031), updates the detail pane when it is
    /// showing this issue, rebuilds the board, and reports through
    /// [`App::report_or_repair`].
    ///
    /// `temp` is the retained edited copy when there is one. It is **not** removed
    /// here: `report_or_repair` keeps it if the written file still has problems,
    /// so the repair prompt has something to reopen, and removes it only once the
    /// edit is clean.
    pub(in crate::app) fn commit_edited_issue(
        &mut self,
        original_filename: &str,
        issue: Issue,
        message: &str,
        temp: Option<PathBuf>,
    ) {
        if issue.title.trim().is_empty() {
            let previous = self.previous_issue(original_filename);
            // A titleless issue has no slug and no stable filename. Nothing is
            // written; the prompt offers the pre-edit title back.
            let problems = vec![edit_problems::missing_title(previous.as_ref())];
            self.enter_repair(original_filename, temp, false, problems);
            return;
        }
        // Back up the version this write is about to replace, so even a clean
        // save leaves the previous content recoverable and names where.
        let backup = self.backup_previous_content(original_filename);
        match self.persist_issue(original_filename, issue) {
            Ok(location) => self.report_or_repair(&location, temp, message, backup),
            Err(e) => {
                self.status_msg = Some(format!("editor: {e}"));
            }
        }
    }

    /// Write `issue` over `original_filename`, reassigning the segment when the
    /// edit changed the assignee, and refresh what the shell shows.
    ///
    /// Returns the relative path actually written (the assignee segment may have
    /// changed, FR-031).
    pub(in crate::app) fn persist_issue(
        &mut self,
        original_filename: &str,
        mut issue: Issue,
    ) -> Result<String> {
        issue.bump_updated();
        // FR-031: when the editor assigned the issue, physically move it into the
        // new assignee segment before writing content. An unassigned edit keeps the
        // current file location.
        let mut location = match &issue.assignee {
            Some(a) => self
                .store
                .reassign(original_filename, Some(a))?
                .to_string_lossy()
                .to_string(),
            None => original_filename.to_string(),
        };
        location = self.store.update(&location, &issue)?;
        issue.filename = location.clone();
        if let Some(d) = &mut self.detail
            && (d.issue.filename == original_filename || d.issue.filename == location)
        {
            d.issue = issue;
            d.scroll_offset.set(0);
        }
        let _ = self.refresh_corpus();
        Ok(location)
    }

    /// Lint the written file and either report `message` or enter the repair
    /// prompt (#1506).
    ///
    /// The edit is already on disk here, so a finding is a *report*: the custom
    /// keys the edit added are preserved either way ([`App::report_or_repair`]
    /// never deletes the file). `backup` is the pre-write copy, named in the
    /// status so the previous version stays findable.
    pub(in crate::app) fn report_or_repair(
        &mut self,
        filename: &str,
        temp: Option<PathBuf>,
        message: &str,
        backup: Option<PathBuf>,
    ) {
        match self.classify_file_problems(filename) {
            Ok(problems) if !problems.is_empty() => {
                // The edit is on disk now, so the round trip is over: only the
                // *unwritten* path keeps `pending_edit` in flight.
                self.pending_edit = None;
                self.enter_repair(filename, temp, true, problems);
            }
            Ok(_) => {
                if let Some(temp) = &temp {
                    let _ = std::fs::remove_file(temp);
                }
                // The round trip is resolved: `reedit_repair` arrives here with
                // the repair prompt still up, so the board is set explicitly
                // rather than assumed.
                self.mode = Mode::Board;
                self.pending_edit = None;
                self.status_msg = Some(names_backup(message, backup.as_ref()));
            }
            Err(e) => {
                if let Some(temp) = &temp {
                    let _ = std::fs::remove_file(temp);
                }
                self.mode = Mode::Board;
                self.pending_edit = None;
                self.status_msg = Some(format!("editor: {e}"));
            }
        }
    }

    /// Every problem `tix lint` reports for `filename`, classified.
    pub(in crate::app) fn classify_file_problems(
        &self,
        filename: &str,
    ) -> Result<Vec<EditProblem>> {
        let findings =
            crate::commands::lint::collect_file(&self.store.config, &self.store, filename)?;
        if findings.is_empty() {
            return Ok(Vec::new());
        }
        let previous = self.previous_issue(filename);
        Ok(edit_problems::for_lint_findings(
            &findings,
            previous.as_ref(),
        ))
    }

    /// The issue as it is on disk, used for the pre-edit title and as the
    /// fallback previous version. `None` when it cannot be read or parsed.
    pub(in crate::app) fn previous_issue(&self, filename: &str) -> Option<Issue> {
        let path = self.store.issues_dir.join(filename);
        let contents = std::fs::read_to_string(path).ok()?;
        Issue::parse(&contents).ok()
    }

    /// Write a recoverable copy of `filename`'s current content into the
    /// centralized backup directory (#1581).
    ///
    /// Every write that replaces the on-disk issue from the editor, repair, or
    /// conflict path goes through this first, so a change tix made is always
    /// recoverable. The copy lands in [`crate::backup::dir`] beside the issues
    /// directory (never beside the issue), and the path is returned so the
    /// status line can name it.
    pub(in crate::app) fn backup_previous_content(&self, filename: &str) -> Option<PathBuf> {
        crate::backup::save(&self.store.issues_dir, filename)
    }

    /// Enter the repair prompt with `problems` (#1506).
    ///
    /// Does nothing when there is nothing to report — every caller guards on a
    /// non-empty list, but an empty prompt would be worse than no prompt.
    pub(in crate::app) fn enter_repair(
        &mut self,
        filename: &str,
        temp: Option<PathBuf>,
        written: bool,
        problems: Vec<EditProblem>,
    ) {
        let Some(first) = problems.first() else {
            return;
        };
        let key = problems.iter().find_map(|problem| match problem.fix() {
            Some(EditFix::DeclareCustomAttribute { key }) => Some(key.clone()),
            _ => None,
        });
        let message = first.summary();
        self.mode = Mode::EditRepair {
            filename: filename.to_string(),
            message: message.clone(),
            key,
            problems,
            temp,
            written,
            discard_armed: false,
        };
        self.status_msg = Some(message);
    }

    /// Override the newer on-disk version with the editor's version (#1510).
    ///
    /// The **only** conflict outcome that writes, and it writes the temp copy's
    /// content rather than the on-disk one: the prompt has already said which file
    /// changed and the user chose their own edit. A temp copy that cannot be read
    /// or parsed leaves the prompt in place instead of closing it, so the user
    /// still has the abandon and compare keys.
    pub(in crate::app) fn override_conflicting_edit(
        &mut self,
        filename: &str,
        temp: &std::path::Path,
    ) {
        let edited = match std::fs::read_to_string(temp) {
            Ok(edited) => edited,
            Err(e) => {
                self.status_msg = Some(format!("editor: {e}"));
                return;
            }
        };
        let issue = match Issue::parse(&edited) {
            Ok(issue) => issue,
            Err(e) => {
                // The temp copy cannot be parsed, so nothing can be written over
                // the newer file. The prompt stays up with both versions intact.
                self.status_msg = Some(format!("editor: {e}"));
                return;
            }
        };
        self.mode = Mode::Board;
        // The temp copy is handed to the commit, which keeps it if the written
        // file still has problems and removes it once the edit is clean.
        self.commit_edited_issue(
            filename,
            issue,
            "Overrode the version that changed on disk with your edit",
            Some(temp.to_path_buf()),
        );
    }

    /// Abandon the editor's version and keep the newer on-disk one (#1510).
    ///
    /// The safe default, and the reason `Esc` is bound to it: the temp copy is
    /// removed and nothing is written, so a write that arrived while the editor was
    /// open is never clobbered by a keypress the user did not mean as a decision.
    pub(in crate::app) fn abandon_conflicting_edit(&mut self, temp: &std::path::Path) {
        let _ = std::fs::remove_file(temp);
        self.mode = Mode::Board;
        self.status_msg =
            Some("kept the version that changed on disk; your edit was discarded".to_string());
    }

    /// Re-open the editor on the conflict prompt's temp copy so the user can
    /// compare the two versions (#1510), then land back on the prompt.
    ///
    /// The disk file's bytes are read **before** and **after** the second editor
    /// run, so a change made while the user compares is detected too — that is the
    /// "re-reading the disk state" the prompt promises. It needs the child and the
    /// child needs the terminal, which is why the keypress returns
    /// [`Action::CompareEdit`] instead of doing this where the key is handled.
    /// Nothing is written either way: the editor opens the temp copy, never the
    /// issue file.
    pub fn compare_conflicting_edit(&mut self) -> Result<()> {
        let (filename, temp, disk_path) = match &self.mode {
            Mode::EditConflict {
                filename,
                temp,
                disk_path,
            } => (filename.clone(), temp.clone(), disk_path.clone()),
            _ => return Ok(()),
        };
        let name = editor::resolve_editor(self.store.config.editor.as_deref())?;
        let before = std::fs::read(&disk_path).map_err(TixError::Io)?;
        editor::run_editor(&name, &temp, &self.store.config)?;
        let after = std::fs::read(&disk_path).map_err(TixError::Io)?;
        // Back to the same prompt: a second look is not a decision, and the three
        // choices have to still be there once the user has looked.
        self.mode = Mode::EditConflict {
            filename,
            temp,
            disk_path,
        };
        self.status_msg = Some(if after == before {
            "the issue changed on disk while you were editing it".to_string()
        } else {
            "the issue changed on disk again while you were comparing it".to_string()
        });
        Ok(())
    }

    /// The edit-conflict prompt's keys (tix #1510).
    ///
    /// The arms read the keys' **canonical** events, like every other modal: the
    /// prompt binds `o`/`y` to `confirm` (canonical `y`), `a`/`Esc` to `ignore`
    /// (canonical `Enter`), and `c`/`r` to `reedit` (canonical `r`), so what arrives
    /// here is `y`, `Enter` and `r` whatever chords the keymap names. `Esc`
    /// therefore abandons exactly as the prompt promises, and no key that is not one
    /// of the three does anything.
    pub(in crate::app) fn handle_edit_conflict_key(&mut self, key: KeyEvent) -> Result<Action> {
        let (filename, temp) = match &self.mode {
            Mode::EditConflict { filename, temp, .. } => (filename.clone(), temp.clone()),
            _ => return Ok(Action::None),
        };
        match key.code {
            KeyCode::Char('y') => {
                self.override_conflicting_edit(&filename, &temp);
                Ok(Action::None)
            }
            // The child needs the terminal, so the event loop runs this and not
            // the handler (see `compare_conflicting_edit`).
            KeyCode::Char('r') => Ok(Action::CompareEdit),
            KeyCode::Enter | KeyCode::Esc => {
                self.abandon_conflicting_edit(&temp);
                Ok(Action::None)
            }
            _ => Ok(Action::None),
        }
    }

    /// Declare `key` in `tix.toml`'s `[custom_attributes]` (#1506) — the one fix
    /// the repair prompt applies by writing config rather than the issue, and the
    /// reason the prompt is not just a nag.
    ///
    /// The entry is appended and `tix.toml` is written through
    /// [`Config::save`](crate::config::Config::save), the same atomic temp-file
    /// path the Config mode uses. An entry that is already declared — compared
    /// case-insensitively, the rule [`Config::custom_attributes`] itself applies —
    /// is not appended again: a second `a` on an open warning is an idempotent
    /// re-run, not a duplicate row.
    ///
    /// `key == None` is a finding that is not an undeclared key, so `a` has
    /// nothing to declare and says so rather than writing an entry that would
    /// silence nothing.
    pub(in crate::app) fn declare_custom_attribute(&mut self, key: Option<&str>) {
        let Some(key) = key.map(str::trim).filter(|k| !k.is_empty()) else {
            self.status_msg = Some(
                "nothing to declare: this finding is not an undeclared frontmatter key".into(),
            );
            return;
        };
        let declared = self.store.config.custom_attributes();
        let already_declared = declared.iter().any(|d| d == &key.to_ascii_lowercase());
        if !already_declared {
            self.store
                .config
                .custom_attributes
                .keys
                .push(key.to_string());
        }
        match self
            .store
            .config_path()
            .and_then(|path| self.store.config.save(&path))
        {
            Ok(()) => {
                self.status_msg = Some(format!(
                    "declared `{key}` in [custom_attributes] in tix.toml"
                ));
            }
            Err(e) => {
                // The warning closed either way, so the status line is the only
                // place this can be reported. Roll the in-memory entry back, so
                // it never claims a declaration that is not on disk.
                if !already_declared {
                    self.store.config.custom_attributes.keys.pop();
                }
                self.status_msg = Some(format!("declare `{key}`: {e}"));
            }
        }
    }

    /// The repair prompt's keys (tix #1506).
    ///
    /// The arms read the keys' **canonical** events, like every other modal:
    /// `handle_key` rewrites a bound key to its action's canonical event before
    /// this runs, so `a`/`y` arrive as `y` (`confirm`), `d` as `d`
    /// (`declare_key`), `r` as `r` (`reedit`), `i`/`Esc` as `Enter` (`ignore`),
    /// and `x` as `x` (`discard`).
    ///
    /// `reedit` hands back [`Action::ReeditRepair`] because the child needs the
    /// terminal; everything else is decided here. **No key discards silently**:
    /// `Esc` acknowledges and keeps the copy, and only a second `x` removes it.
    pub(in crate::app) fn handle_edit_repair_key(&mut self, key: KeyEvent) -> Result<Action> {
        match key.code {
            KeyCode::Char('y') => {
                self.apply_repair_fix();
                Ok(Action::None)
            }
            KeyCode::Char('d') => {
                self.declare_repair_key();
                Ok(Action::None)
            }
            KeyCode::Char('r') => Ok(Action::ReeditRepair),
            KeyCode::Char('x') => {
                self.arm_or_discard_repair();
                Ok(Action::None)
            }
            KeyCode::Enter | KeyCode::Esc => {
                self.acknowledge_repair();
                Ok(Action::None)
            }
            _ => Ok(Action::None),
        }
    }

    /// Apply the first fix the prompt proposes (#1506).
    ///
    /// An undeclared key's fix *is* the declaration, so `confirm` keeps #1506's
    /// behaviour there. The fix operates on the retained copy (or the issue file
    /// when the edit is already written) and the result is re-parsed: a fix that
    /// does not make the file valid leaves it untouched and re-reports, and one
    /// that does is written with the previous version backed up.
    pub(in crate::app) fn apply_repair_fix(&mut self) {
        let (filename, temp, problems) = match &self.mode {
            Mode::EditRepair {
                filename,
                temp,
                problems,
                ..
            } => (filename.clone(), temp.clone(), problems.clone()),
            _ => return,
        };
        let Some(problem) = problems.iter().find(|problem| problem.fix().is_some()) else {
            // #1506: `confirm` on a prompt whose problem is the undeclared key is
            // the declaration itself, whether or not the key was carried as a fix.
            if let Mode::EditRepair { key: Some(key), .. } = &self.mode {
                let key = key.clone();
                self.declare_custom_attribute(Some(&key));
                self.mode = Mode::Board;
                self.pending_edit = None;
                return;
            }
            // A finding that is not an undeclared key has nothing to declare, and
            // the wording is the one the old warning used. `confirm` closes the
            // prompt, exactly as the old warning did (the reported problem stays
            // on disk and in `tix lint`; there is nothing to decide here).
            self.status_msg = Some(
                "nothing to declare: this finding is not an undeclared frontmatter key".into(),
            );
            self.mode = Mode::Board;
            self.pending_edit = None;
            return;
        };
        let Some(fix) = problem.fix().cloned() else {
            return;
        };
        if let EditFix::DeclareCustomAttribute { key } = &fix {
            self.declare_custom_attribute(Some(key));
            self.mode = Mode::Board;
            self.pending_edit = None;
            return;
        }
        let source = match &temp {
            Some(temp) => temp.clone(),
            None => self.store.issues_dir.join(&filename),
        };
        let contents = match std::fs::read_to_string(&source) {
            Ok(contents) => contents,
            Err(e) => {
                self.status_msg = Some(format!("editor: {e}"));
                return;
            }
        };
        let Some(fixed) = fix.apply(&contents) else {
            self.status_msg = Some(format!(
                "could not apply `{}`; the file is untouched",
                fix.label()
            ));
            return;
        };
        let label = fix.label();
        match Issue::parse(&fixed) {
            Ok(issue) => {
                let backup = self.backup_previous_content(&filename);
                match self.persist_issue(&filename, issue) {
                    Ok(location) => {
                        if let Some(temp) = &temp {
                            let _ = std::fs::remove_file(temp);
                        }
                        self.pending_edit = None;
                        self.mode = Mode::Board;
                        self.status_msg = Some(names_backup(
                            &format!("applied `{label}` to {location}"),
                            backup.as_ref(),
                        ));
                    }
                    Err(e) => self.status_msg = Some(format!("editor: {e}")),
                }
            }
            Err(e) => {
                // The fix did not make the file valid. Nothing was written — the
                // repaired text only ever existed as a local string — so the
                // retained copy is untouched and the remaining problems are what
                // the prompt now lists.
                let previous = self.previous_issue(&filename);
                let problems =
                    edit_problems::for_parse_error(&error_message(&e), &fixed, previous.as_ref());
                if let Mode::EditRepair {
                    problems: current, ..
                } = &mut self.mode
                {
                    *current = problems;
                }
                self.status_msg = Some(format!(
                    "the fix did not make the file valid: {e}; the file is untouched"
                ));
            }
        }
    }

    /// Declare the prompt's undeclared key (#1506), or say there is none.
    ///
    /// Closes to the board either way, as the old warning did: the declaration is
    /// what silences the finding, and the custom key is already on disk.
    pub(in crate::app) fn declare_repair_key(&mut self) {
        let key = match &self.mode {
            Mode::EditRepair { key, .. } => key.clone(),
            _ => None,
        };
        self.declare_custom_attribute(key.as_deref());
        self.mode = Mode::Board;
        self.pending_edit = None;
    }

    /// Acknowledge the prompt and **keep** the retained copy (#1506).
    ///
    /// `Esc` lands here, which is why it can never destroy an edit: the worst a
    /// stray key does is leave the copy where the status line names it.
    pub(in crate::app) fn acknowledge_repair(&mut self) {
        let temp = match &self.mode {
            Mode::EditRepair { temp, .. } => temp.clone(),
            _ => None,
        };
        self.mode = Mode::Board;
        self.pending_edit = None;
        self.status_msg = Some(match &temp {
            Some(temp) => format!("kept your edited copy at {}", temp.display()),
            None => "kept your edit".to_string(),
        });
    }

    /// Arm a discard, or perform it on the second press (#1506).
    ///
    /// Two presses because "I saw it" and "throw it away" are two decisions, and
    /// this is the **only** action in the whole flow that removes the retained
    /// copy.
    pub(in crate::app) fn arm_or_discard_repair(&mut self) {
        if let Mode::EditRepair {
            discard_armed,
            temp,
            ..
        } = &mut self.mode
        {
            if !*discard_armed {
                *discard_armed = true;
                self.status_msg = Some(
                    "press the discard key again to remove the retained copy — this cannot be \
                     undone"
                        .to_string(),
                );
                return;
            }
            let temp = temp.clone();
            self.mode = Mode::Board;
            self.pending_edit = None;
            match temp {
                Some(temp) => {
                    let _ = std::fs::remove_file(&temp);
                    self.status_msg = Some(format!("discarded your edit ({})", temp.display()));
                }
                None => {
                    self.status_msg =
                        Some("nothing to discard: the edit is already on disk".to_string())
                }
            }
        }
    }

    /// Re-open the editor on the repair prompt's retained copy (#1506).
    ///
    /// Called from the event loop because the child needs the terminal, exactly
    /// as [`App::compare_conflicting_edit`] is. The edited copy is re-parsed when
    /// it comes back: a valid file is committed (with the previous version backed
    /// up), an invalid one re-enters the same prompt with fresh problems, and
    /// either way the copy survives.
    pub fn reedit_repair(&mut self) -> Result<()> {
        let (filename, temp) = match &self.mode {
            Mode::EditRepair { filename, temp, .. } => (filename.clone(), temp.clone()),
            _ => return Ok(()),
        };
        let name = editor::resolve_editor(self.store.config.editor.as_deref())?;
        // No retained copy means the edit is already on disk (the #1506
        // warn-after-write path): materialise one so the re-edit has a copy to
        // work on and the prompt keeps the guarantee that its copy only goes away
        // by discard.
        let temp = match temp {
            Some(temp) => temp,
            None => {
                let contents = std::fs::read_to_string(self.store.issues_dir.join(&filename))
                    .map_err(TixError::Io)?;
                let temp = std::env::temp_dir().join(format!(
                    "tix-edit-repair-{}-{}.md",
                    std::process::id(),
                    filename.replace('/', "-")
                ));
                std::fs::write(&temp, contents).map_err(TixError::Io)?;
                temp
            }
        };
        editor::run_editor(&name, &temp, &self.store.config)?;
        let edited = std::fs::read_to_string(&temp).map_err(TixError::Io)?;
        match Issue::parse(&edited) {
            Ok(issue) => {
                self.commit_edited_issue(&filename, issue, "Edited", Some(temp));
            }
            Err(e) => {
                let previous = self.previous_issue(&filename);
                let problems =
                    edit_problems::for_parse_error(&error_message(&e), &edited, previous.as_ref());
                let message = problems
                    .first()
                    .map(EditProblem::summary)
                    .unwrap_or_else(|| error_message(&e));
                if let Mode::EditRepair {
                    problems: current,
                    temp: kept,
                    written,
                    discard_armed,
                    ..
                } = &mut self.mode
                {
                    *current = problems;
                    *kept = Some(temp);
                    // The revised copy is not on disk, whatever the prompt said
                    // about the version that was.
                    *written = false;
                    *discard_armed = false;
                }
                self.status_msg = Some(message);
            }
        }
        Ok(())
    }
}