Module render 

Render layer for the git TUI overlay.

• plan_overlay / RenderPlan — pure layout math (chunks per pane)
• pair_split_view — pair removed + added lines per hunk so the side-by-side renderer can align left/right columns with shared context
• render_sidebar_rows — pure sidebar row builder (text only — no ratatui styles) so the layout can be tested without a terminal
• minimap_buckets_rows — per-row added/removed ratio for the right-edge minimap strip
• render_overlay_lines — ratatui draw fn, consumed by render_frame

The layout math is deliberately separated from the draw step so the bulk of the test surface stays in pure helpers.

Structs

MinimapBucket

One bucket of the minimap: ratio of added vs removed lines on a given screen row (0.0 = pure removal, 1.0 = pure addition).

RenderPlan

Layout plan returned by plan_overlay. One chunk per pane.

SidebarRow

One row of the sidebar (file list).

SplitRow

One paired row of a split view: left = removed-side text, right = added-side text. Either side may be empty (when a hunk has all additions or all deletions).

Functions

footer_hints

Footer hint line. Returned as a String (not Line) so the test can assert content without bringing in ratatui’s Style.

hunk_scroll_offset

Scroll offset (rows) that brings the selected hunk’s header into the diff pane: min(header offset, overflow). With the header at the pane top when it fits, and pinned to the last pane-height window when the hunk sits near the end of the diff. Pane taller than the whole diff → 0 (no scroll).

minimap_buckets_rows

Bucket a flat list of (line-kind) rows into rows slots so the minimap draws one cell per visible row.

pair_split_view

Pair context / removed / added lines for one hunk into left/right rows suitable for side-by-side rendering.

plan_overlay

Decide how wide each pane should be given the viewport.

render_overlay_lines

Draw the overlay into frame. The caller is expected to have already clipped the frame to a sane area (the brief: overlay REPLACES the scrollback+composer region entirely — render_frame in main_loop.rs handles the area split).

render_sidebar_rows

Build the sidebar rows. staged marks paths with [S] (whatever the user has staged via toggle_stage); unmerged entries always get [U]. Order follows the input entries (which is git status porcelain order).