ADR-0016 + Iter 5/6 follow-up: pretty table rendering
Replaces the placeholder pipe-and-dash output with Unicode box-drawing tables for both data results and table-structure listings, per ADR-0016. * New `src/output_render.rs` module with `render_data_table` and `render_structure`. Hand-rolled to match the project's existing CSV/YAML pattern; ~300 lines. * Header-only outer-frame border style: outer ┌─┐│└─┘ box + ├─┤ header underline, no per-row separators. NULL renders as `(null)`; cell newlines/tabs/control chars become `↵`/`→`/`·` as display-only substitutions. * Type-aware column alignment: numeric types right-aligned, everything else left. `DataResult` gains a `column_types: Vec<Option<Type>>` field, populated from the existing metadata lookup at the two query sites in db.rs (no new query paths). * Structure view shows Name | Type | Constraints columns; References / Referenced-by sections retain plain-text format, leaving room for the future relationship-rendering ADR. * 18 new unit tests in output_render.rs (plus 4 insta snapshots for the canonical layouts). Existing assertions in app.rs and walking_skeleton.rs updated to match the new format. Total: 426 passing, 0 failing, 0 skipped (up from 408). Clippy clean.
This commit is contained in:
claude@clouddev1
@@ -0,0 +1,595 @@
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//! Pretty-table rendering for the output panel
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//! (ADR-0016).
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//!
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//! Two public entry points: [`render_data_table`] for query
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//! / show-data / auto-show outputs, and [`render_structure`]
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//! for table-structure listings produced after DDL or
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//! `show table`.
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//!
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//! Both return a `Vec<String>` — one display row per element
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//! — to match the existing `OutputLine`-per-line discipline
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//! in `app.rs`. Border chars are Unicode box-drawing
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//! (UTF-8); no ASCII fallback (ADR-0016 OOS-5).
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//!
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//! Layout: outer frame + header underline only. No per-row
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//! horizontal rules, which keeps typical row counts (5–50)
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//! readable without visual noise.
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//!
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//! NULL renders as the literal `(null)`; cell newlines, tabs
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//! and control characters render as `↵`, `→`, `·`
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//! respectively (display-only — underlying data is
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//! untouched).
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use crate::db::{ColumnDescription, DataResult, TableDescription};
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use crate::dsl::Type;
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const NULL_DISPLAY: &str = "(null)";
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/// Render a query / data result as a Vec of display rows.
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///
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/// Empty result sets yield the header + a `(no rows)` line
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/// inside the frame — matches the existing UX hint that "the
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/// query ran but there was nothing to show."
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#[must_use]
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pub fn render_data_table(data: &DataResult) -> Vec<String> {
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let header_cells: Vec<String> = data.columns.clone();
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let alignments: Vec<Alignment> = data
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.column_types
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.iter()
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.map(|t| alignment_for(*t))
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.collect();
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let body: Vec<Vec<String>> = if data.rows.is_empty() {
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// For empty tables, still render the header band so
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// the user sees the column shape, then a single
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// `(no rows)` row spanning all columns. We achieve
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// the spanning effect with a left-aligned cell in
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// the first column and empty cells elsewhere.
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let mut row = vec![String::new(); header_cells.len().max(1)];
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if let Some(first) = row.first_mut() {
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*first = "(no rows)".to_string();
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}
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vec![row]
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} else {
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data.rows
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.iter()
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.map(|r| {
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r.iter()
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.map(|c| {
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c.as_ref()
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.map_or_else(|| NULL_DISPLAY.to_string(), |s| sanitize_cell(s))
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})
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.collect()
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})
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.collect()
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};
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render_table(&header_cells, &body, &alignments)
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}
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/// Render a table-structure listing.
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///
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/// Produces a header line (`<TableName>`), the schema table
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/// itself, and — for a structure that has FK relationships
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/// — `References:` / `Referenced by:` blocks below as plain
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/// indented text (relationship visualization is its own
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/// future ADR per §5 OOS-1).
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#[must_use]
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pub fn render_structure(desc: &TableDescription) -> Vec<String> {
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let mut out: Vec<String> = Vec::new();
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out.push(desc.name.clone());
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let header_cells = vec![
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"Name".to_string(),
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"Type".to_string(),
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"Constraints".to_string(),
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];
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let body: Vec<Vec<String>> = desc
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.columns
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.iter()
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.map(|c| {
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vec![
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c.name.clone(),
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type_display(c),
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constraints_display(c),
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]
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})
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.collect();
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// Type column gets the same numeric/text rule as data
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// columns by virtue of consistency, but every entry is
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// a keyword string ("text", "serial", …) so left-align
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// is correct in every case. Constraints are similarly
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// textual.
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let alignments = vec![Alignment::Left, Alignment::Left, Alignment::Left];
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out.extend(render_table(&header_cells, &body, &alignments));
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if !desc.outbound_relationships.is_empty() {
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out.push("References:".to_string());
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for r in &desc.outbound_relationships {
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out.push(format!(
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" {} → {}.{} ({}, on delete {}, on update {})",
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r.local_column,
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r.other_table,
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r.other_column,
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r.name,
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r.on_delete,
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r.on_update,
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));
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}
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}
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if !desc.inbound_relationships.is_empty() {
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out.push("Referenced by:".to_string());
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for r in &desc.inbound_relationships {
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out.push(format!(
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" {}.{} → {} ({}, on delete {}, on update {})",
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r.other_table,
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r.other_column,
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r.local_column,
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r.name,
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r.on_delete,
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r.on_update,
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));
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}
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}
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out
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum Alignment {
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Left,
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Right,
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}
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/// Map a user-facing type to its column alignment per
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/// ADR-0016 §2. `None` (foreign-attached, no metadata)
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/// falls back to Left.
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const fn alignment_for(ty: Option<Type>) -> Alignment {
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match ty {
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Some(Type::Int | Type::Real | Type::Decimal | Type::Serial) => Alignment::Right,
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Some(Type::Text)
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| Some(Type::Bool)
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| Some(Type::Date)
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| Some(Type::DateTime)
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| Some(Type::Blob)
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| Some(Type::ShortId)
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| None => Alignment::Left,
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}
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}
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fn type_display(c: &ColumnDescription) -> String {
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c.user_type
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.map_or_else(|| c.sqlite_type.to_lowercase(), |t| t.keyword().to_string())
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}
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fn constraints_display(c: &ColumnDescription) -> String {
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let mut parts: Vec<&str> = Vec::new();
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if c.primary_key {
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parts.push("PK");
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}
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if c.notnull {
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parts.push("NOT NULL");
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}
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parts.join(", ")
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}
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/// Replace newlines / tabs / other control characters with
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/// visible display markers per ADR-0016 §3. Display-only;
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/// underlying data is untouched.
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fn sanitize_cell(s: &str) -> String {
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let mut out = String::with_capacity(s.len());
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for ch in s.chars() {
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match ch {
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'\n' => out.push('↵'),
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'\t' => out.push('→'),
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c if (c as u32) < 0x20 => out.push('·'),
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other => out.push(other),
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}
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}
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out
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}
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/// Width in Unicode codepoints. Matches existing
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/// width-counting throughout the codebase; deferring true
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/// Unicode-Width handling to a later pass.
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fn cell_width(s: &str) -> usize {
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s.chars().count()
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}
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/// Render a single bordered table given header cells, body
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/// rows, and per-column alignment. Outer frame +
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/// header-underline only.
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fn render_table(
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headers: &[String],
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body: &[Vec<String>],
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alignments: &[Alignment],
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) -> Vec<String> {
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debug_assert_eq!(headers.len(), alignments.len());
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// Compute column widths: max(header, all body cells).
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// Empty headers + empty body produces an empty table,
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// which we still want to render as a single horizontal
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// line — easier to reason about than a missing one.
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let column_count = headers.len();
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let mut widths: Vec<usize> = headers.iter().map(|s| cell_width(s)).collect();
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for row in body {
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for (i, cell) in row.iter().enumerate() {
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if i < widths.len() {
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let w = cell_width(cell);
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if w > widths[i] {
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widths[i] = w;
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}
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}
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}
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}
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let mut out: Vec<String> = Vec::with_capacity(body.len() + 3);
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out.push(border_row(&widths, BorderRow::Top));
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out.push(content_row(headers, &widths, alignments));
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out.push(border_row(&widths, BorderRow::HeaderUnderline));
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if column_count == 0 {
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// Nothing more to render; the bottom border closes
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// an empty box. Unusual but well-defined.
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} else {
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for row in body {
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out.push(content_row(row, &widths, alignments));
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}
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}
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out.push(border_row(&widths, BorderRow::Bottom));
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out
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}
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#[derive(Debug, Clone, Copy)]
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enum BorderRow {
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Top,
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HeaderUnderline,
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Bottom,
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}
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fn border_row(widths: &[usize], kind: BorderRow) -> String {
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let (left, mid, right) = match kind {
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BorderRow::Top => ('┌', '┬', '┐'),
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BorderRow::HeaderUnderline => ('├', '┼', '┤'),
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BorderRow::Bottom => ('└', '┴', '┘'),
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};
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let mut s = String::new();
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s.push(left);
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if widths.is_empty() {
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s.push(right);
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return s;
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}
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for (i, w) in widths.iter().enumerate() {
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if i > 0 {
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s.push(mid);
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}
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// One space of padding on each side of the cell, so
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// a width-w cell occupies w + 2 box columns.
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for _ in 0..(w + 2) {
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s.push('─');
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}
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}
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s.push(right);
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s
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}
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fn content_row(cells: &[String], widths: &[usize], alignments: &[Alignment]) -> String {
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let mut s = String::new();
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s.push('│');
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for (i, w) in widths.iter().enumerate() {
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let cell = cells.get(i).cloned().unwrap_or_default();
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let align = alignments.get(i).copied().unwrap_or(Alignment::Left);
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s.push(' ');
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let pad_total = w.saturating_sub(cell_width(&cell));
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match align {
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Alignment::Left => {
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s.push_str(&cell);
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for _ in 0..pad_total {
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s.push(' ');
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}
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}
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Alignment::Right => {
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for _ in 0..pad_total {
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s.push(' ');
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}
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s.push_str(&cell);
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}
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}
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s.push(' ');
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s.push('│');
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}
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s
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::db::{ColumnDescription, RelationshipEnd};
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use crate::dsl::ReferentialAction;
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use insta::assert_snapshot;
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fn col(name: &str, ty: Type, pk: bool, notnull: bool) -> ColumnDescription {
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ColumnDescription {
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name: name.to_string(),
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user_type: Some(ty),
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sqlite_type: match ty {
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Type::Int | Type::Serial | Type::Bool => "INTEGER".to_string(),
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Type::Real => "REAL".to_string(),
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Type::Blob => "BLOB".to_string(),
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_ => "TEXT".to_string(),
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},
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notnull,
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primary_key: pk,
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}
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}
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// --- Width / alignment helpers ----------------------
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#[test]
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fn alignment_for_numeric_types_is_right() {
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for ty in [Type::Int, Type::Real, Type::Decimal, Type::Serial] {
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assert_eq!(alignment_for(Some(ty)), Alignment::Right, "{ty:?}");
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}
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}
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#[test]
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fn alignment_for_other_types_is_left() {
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for ty in [
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Type::Text,
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Type::Bool,
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Type::Date,
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Type::DateTime,
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Type::Blob,
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Type::ShortId,
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] {
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assert_eq!(alignment_for(Some(ty)), Alignment::Left, "{ty:?}");
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}
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}
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#[test]
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fn alignment_for_unknown_type_is_left() {
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assert_eq!(alignment_for(None), Alignment::Left);
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}
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// --- sanitize_cell ----------------------------------
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#[test]
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fn sanitize_replaces_newline_with_return_arrow() {
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assert_eq!(sanitize_cell("a\nb"), "a↵b");
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}
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#[test]
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fn sanitize_replaces_tab_with_arrow() {
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assert_eq!(sanitize_cell("a\tb"), "a→b");
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}
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#[test]
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fn sanitize_replaces_other_control_chars_with_dot() {
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// \x07 is BEL; should become a middle dot.
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assert_eq!(sanitize_cell("a\x07b"), "a·b");
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}
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#[test]
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fn sanitize_passes_through_normal_text() {
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assert_eq!(sanitize_cell("Alice & Bob"), "Alice & Bob");
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}
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// --- cell_width -------------------------------------
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#[test]
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fn cell_width_counts_codepoints_not_bytes() {
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// 'é' is 2 bytes in UTF-8 but counts as 1 codepoint.
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assert_eq!(cell_width("héllo"), 5);
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assert_eq!("héllo".len(), 6);
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}
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// --- render_data_table snapshots --------------------
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#[test]
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fn render_data_table_basic_shape() {
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let data = DataResult {
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table_name: "Customers".to_string(),
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columns: vec!["id".to_string(), "Name".to_string(), "Email".to_string()],
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column_types: vec![
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Some(Type::Serial),
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Some(Type::Text),
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Some(Type::Text),
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],
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rows: vec![
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vec![
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Some("1".to_string()),
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Some("Alice".to_string()),
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Some("a@example.io".to_string()),
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],
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vec![
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Some("2".to_string()),
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Some("Bob".to_string()),
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Some("b@example.io".to_string()),
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],
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],
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};
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assert_snapshot!(render_data_table(&data).join("\n"));
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}
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#[test]
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fn render_data_table_empty_rows_shows_no_rows_marker() {
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let data = DataResult {
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table_name: "Customers".to_string(),
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columns: vec!["id".to_string(), "Name".to_string()],
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column_types: vec![Some(Type::Serial), Some(Type::Text)],
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rows: Vec::new(),
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};
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let out = render_data_table(&data).join("\n");
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assert!(out.contains("(no rows)"), "got:\n{out}");
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assert_snapshot!(out);
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}
|
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|
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#[test]
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fn render_data_table_nulls_render_as_null_marker() {
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let data = DataResult {
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table_name: "T".to_string(),
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columns: vec!["a".to_string(), "b".to_string()],
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column_types: vec![Some(Type::Int), Some(Type::Text)],
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rows: vec![
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vec![Some("1".to_string()), None],
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vec![None, Some("hi".to_string())],
|
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],
|
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};
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let out = render_data_table(&data).join("\n");
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assert!(out.contains("(null)"), "got:\n{out}");
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}
|
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#[test]
|
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fn render_data_table_right_aligns_numerics() {
|
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// A numeric column with mixed-width values should
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// right-align so the digits' ones place stacks.
|
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// Single-char header keeps column width = max body
|
||||
// width = 3 (i.e. "999"), making the assertions
|
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// explicit.
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let data = DataResult {
|
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table_name: "T".to_string(),
|
||||
columns: vec!["n".to_string()],
|
||||
column_types: vec![Some(Type::Int)],
|
||||
rows: vec![
|
||||
vec![Some("1".to_string())],
|
||||
vec![Some("42".to_string())],
|
||||
vec![Some("999".to_string())],
|
||||
],
|
||||
};
|
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let out = render_data_table(&data).join("\n");
|
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// The narrowest value ("1") must have leading
|
||||
// padding so its rightmost digit lines up with "9"
|
||||
// and "2" in the wider rows.
|
||||
assert!(
|
||||
out.contains("│ 1 │"),
|
||||
"expected right-aligned `1`:\n{out}",
|
||||
);
|
||||
assert!(
|
||||
out.contains("│ 42 │"),
|
||||
"expected right-aligned `42`:\n{out}",
|
||||
);
|
||||
assert!(
|
||||
out.contains("│ 999 │"),
|
||||
"expected right-aligned `999`:\n{out}",
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn render_data_table_left_aligns_text() {
|
||||
let data = DataResult {
|
||||
table_name: "T".to_string(),
|
||||
columns: vec!["Name".to_string()],
|
||||
column_types: vec![Some(Type::Text)],
|
||||
rows: vec![
|
||||
vec![Some("Alice".to_string())],
|
||||
vec![Some("Bo".to_string())],
|
||||
],
|
||||
};
|
||||
let out = render_data_table(&data).join("\n");
|
||||
assert!(
|
||||
out.contains("│ Alice │"),
|
||||
"expected left-aligned `Alice`:\n{out}",
|
||||
);
|
||||
assert!(
|
||||
out.contains("│ Bo │"),
|
||||
"expected left-aligned `Bo` with trailing pad:\n{out}",
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn render_data_table_handles_newline_in_cell() {
|
||||
let data = DataResult {
|
||||
table_name: "T".to_string(),
|
||||
columns: vec!["note".to_string()],
|
||||
column_types: vec![Some(Type::Text)],
|
||||
rows: vec![vec![Some("Hello\nWorld".to_string())]],
|
||||
};
|
||||
let out = render_data_table(&data).join("\n");
|
||||
assert!(out.contains("Hello↵World"), "got:\n{out}");
|
||||
}
|
||||
|
||||
// --- render_structure snapshots ---------------------
|
||||
|
||||
#[test]
|
||||
fn render_structure_basic() {
|
||||
let desc = TableDescription {
|
||||
name: "Customers".to_string(),
|
||||
columns: vec![
|
||||
col("id", Type::Serial, true, false),
|
||||
col("Name", Type::Text, false, true),
|
||||
col("Email", Type::Text, false, false),
|
||||
],
|
||||
outbound_relationships: Vec::new(),
|
||||
inbound_relationships: Vec::new(),
|
||||
};
|
||||
assert_snapshot!(render_structure(&desc).join("\n"));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn render_structure_with_relationships() {
|
||||
let desc = TableDescription {
|
||||
name: "Customers".to_string(),
|
||||
columns: vec![col("id", Type::Serial, true, false)],
|
||||
outbound_relationships: Vec::new(),
|
||||
inbound_relationships: vec![RelationshipEnd {
|
||||
name: "cust_orders".to_string(),
|
||||
other_table: "Orders".to_string(),
|
||||
other_column: "cust_id".to_string(),
|
||||
local_column: "id".to_string(),
|
||||
on_delete: ReferentialAction::Cascade,
|
||||
on_update: ReferentialAction::NoAction,
|
||||
}],
|
||||
};
|
||||
let out = render_structure(&desc).join("\n");
|
||||
assert!(
|
||||
out.contains("Referenced by:"),
|
||||
"expected inbound relationship section:\n{out}",
|
||||
);
|
||||
assert!(
|
||||
out.contains("Orders.cust_id → id"),
|
||||
"expected inbound relationship line:\n{out}",
|
||||
);
|
||||
assert_snapshot!(out);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn render_structure_pk_and_notnull_render_in_constraints() {
|
||||
let desc = TableDescription {
|
||||
name: "T".to_string(),
|
||||
columns: vec![
|
||||
col("id", Type::Serial, true, false),
|
||||
col("name", Type::Text, false, true),
|
||||
col("nick", Type::Text, false, false),
|
||||
],
|
||||
outbound_relationships: Vec::new(),
|
||||
inbound_relationships: Vec::new(),
|
||||
};
|
||||
let out = render_structure(&desc).join("\n");
|
||||
// PK appears for id, NOT NULL for name, blank for nick.
|
||||
assert!(out.contains("│ id │ serial │ PK"), "got:\n{out}");
|
||||
assert!(out.contains("│ name │ text │ NOT NULL"), "got:\n{out}");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn render_structure_falls_back_to_sqlite_type_when_user_type_missing() {
|
||||
let mut desc = TableDescription {
|
||||
name: "T".to_string(),
|
||||
columns: vec![ColumnDescription {
|
||||
name: "x".to_string(),
|
||||
user_type: None,
|
||||
sqlite_type: "INTEGER".to_string(),
|
||||
notnull: false,
|
||||
primary_key: false,
|
||||
}],
|
||||
outbound_relationships: Vec::new(),
|
||||
inbound_relationships: Vec::new(),
|
||||
};
|
||||
let out = render_structure(&desc).join("\n");
|
||||
// The lowercase form of the SQLite type should appear.
|
||||
assert!(out.contains("integer"), "got:\n{out}");
|
||||
// And the name column should still align correctly with no user_type.
|
||||
desc.columns[0].user_type = Some(Type::Int);
|
||||
let with_type = render_structure(&desc).join("\n");
|
||||
assert!(with_type.contains("int"), "got:\n{with_type}");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user