com.blockether.vis.ext.channel-tui.primitives — com.blockether/vis-channel-tui 0.1.1

Low-level drawing primitives wrapping Lanterna TextGraphics. All rendering code should use these instead of raw Java interop.

Width-math contract

String width here means display columns the terminal will paint, NOT Java .length() and NOT (count s). Those count UTF-16 code units; a single emoji like 📁 is two code units but two columns, a CJK glyph like 日 is one code unit but two columns, a flag sequence 🇵🇱 is four code units, one grapheme, two columns. Mix the two and your alignment drifts.

Use display-width and truncate-cols for any string that could contain non-ASCII. Plain count/subs are still allowed for ASCII internals (box-drawing strings we authored, single-glyph keystroke labels, etc.) where the answer is identical and the call is a hot path.

align clj

(align s width mode)

Align s to width display columns by mode: :left pad on the right (default for any unknown mode) :right pad on the left :center pad both sides :justify full-justify the words (flush both margins).

BLINK clj

BOLD clj

BORDERED clj

BOX_BL clj

BOX_BR clj

BOX_H clj

BOX_T_L clj

BOX_T_R clj

BOX_TL clj

BOX_TR clj

BOX_V clj

center-text clj

(center-text s w)

Center string within w terminal columns, padding both sides. Truncates (column-aware) if too wide.

clear-styles! clj

(clear-styles! g)

Remove all active text styles.

col-prefix-end clj

(col-prefix-end s max-cols)

Return the char-index i such that (subs s 0 i) is the longest prefix of s whose display-width is <= max-cols AND that does NOT split a grapheme cluster.

Use this when you need both the prefix and the position of the un-consumed remainder (e.g. in word-wrapping). For just the prefix, truncate-cols is friendlier.

Returns 0 for nil/empty or non-positive max-cols.

CROSSED-OUT clj

cursor-pos clj

(cursor-pos col row)

Create a TerminalPosition for cursor placement.

disable! clj

(disable! g & modifiers)

Disable one or more text styles.

display-width clj

(display-width s)

Number of terminal columns s will occupy when painted by lanterna.

Built on TextCharacter/fromString, the same routine AbstractTextGraphics.putString uses internally after PR #625, so what we measure matches what the renderer actually paints - grapheme clusters honoured (BreakIterator-based), CJK + emoji counted as two columns, ASCII as one.

Inline span sentinels (INLINE_*_ON/OFF, range ...) count as zero columns: they're invisible style toggles, never painted, never advance the cursor.

Stray ASCII control bytes (0x00-0x1F) get sanitized to / before reaching Lanterna - see sanitize-control-chars for the why. Without that, a single rogue in a paint string used to take down the entire render thread.

Returns 0 for nil/empty input.

dot-cell! clj

(dot-cell! g col row fg)

Overlay a bottom-flush ▁ mark in fg colour onto the SINGLE cell at (col,row), keeping its existing background, but ONLY when that cell is currently a blank space OR an existing ▁ mark. ▁ (LOWER ONE EIGHTH BLOCK) sits flush on the cell's bottom edge — the SAME row as an underline-cell! border — so the running tab's marching marks line up with the ready tab's underline instead of floating one line high like a baseline . did (which read as flicker). Only blank padding cells are touched, so the number, | separator, label, and close ✕ (non-blank) are never clobbered — but a prior ▁ may be RE-COLOURED, which lets a running tab paint a dim base line then overlay a bright marching band on top. No-op off-screen or over any non-blank glyph.

draw-box! clj

(draw-box! g left top w h)

Draw a single-line bordered box at (left, top) of size wxh. Draws corners, edges. Does NOT fill interior.

draw-centered! clj

(draw-centered! g left row width text)

Draw text centered at row within [left, left+width).

draw-selection-marker! clj

(draw-selection-marker! g col row selected?)

(draw-selection-marker! g col row selected? marker-fg)

Paint the selection marker at (col, row) when selected? is truthy. Unselected rows get nothing — the surrounding row fill is expected to already cover those cells.

The glyph is rendered BOLD. Provide marker-fg to give it its own color (e.g. dialog-hint-key); when omitted, whatever fg is currently set on g is used.

See the Selection marker block above for the project-wide rationale. Callers that need the prefix as a STRING (to inline into a row label) should use selection-prefix instead.

draw-separator! clj

(draw-separator! g left right row)

Draw a horizontal separator with T-junctions at left/right edges.

draw-space-around! clj

(draw-space-around! g left row width items)

Draw items spread across row within [left, left+width) with space-around.

draw-space-between! clj

(draw-space-between! g left row width items)

Draw items spread across row within [left, left+width) with space-between.

draw-tabs! clj

(draw-tabs! g
            tabs
            {:keys [left row width active-id gap fg bg active-fg active-bg
                    inactive-fg inactive-bg bordered?]})

Draw a tab strip and return its geometry.

Required opts: :left, :row, :width, :active-id, :fg, :bg, :active-fg, :active-bg, :inactive-fg, :inactive-bg. Optional: :gap, :bordered?.

This primitive knows layout and drawing only. Callers own domain actions and click-region registration.

enable! clj

(enable! g & modifiers)

Enable one or more text styles. modifiers are SGR constants (BOLD, ITALIC, etc.).

fill-rect! clj

(fill-rect! g col row w h)

(fill-rect! g col row w h ch)

Fill a rectangle at (col, row) of size wxh with the given char (default space).

fold-cols clj

(fold-cols s max-cols)

Character-fold s into a vector of segments, each at most max-cols display columns wide, never splitting a grapheme cluster.

This is a terminal-style SOFT WRAP, the soft-wrap primitive shared by the agent code rail and the tool-result code blocks: unlike word-wrap it never drops or reflows whitespace — the bytes are preserved exactly and a break is inserted only at the column boundary. So a pathologically wide single line (a one-line git_commit message arg, a wide clj_eval value map) folds at the bubble edge instead of overflowing or being clipped, while indentation and in-row column alignment survive.

The fold itself is lanterna's TerminalTextUtils/foldColumns — the same grapheme/EAW-aware text-flow family the screen paints with (displayWidth / wordWrap / justify). A line already within budget comes back [s] unchanged, so normal multi-line source is untouched and only the over-wide rows fold. nil/empty returns [""].

Input carrying an ESC (0x1b) is returned unfolded — foldColumns is plain-text-only (the grapheme splitter throws on ESC); callers that need ANSI-aware width clip such rows separately.

GLYPH_DIR clj

GLYPH_RESOURCES clj

horiz-line clj

(horiz-line n)

Return a string of n horizontal box-drawing chars.

inline-sentinel? clj

(inline-sentinel? g)

True when g (a single grapheme String) is one of the eight inline span sentinels above. Cheap range check, no map lookup.

INLINE_BOLD_OFF clj

INLINE_BOLD_ON clj

INLINE_CODE_OFF clj

INLINE_CODE_ON clj

INLINE_ITALIC_OFF clj

INLINE_ITALIC_ON clj

INLINE_LINK_OFF clj

INLINE_LINK_ON clj

INLINE_STRIKE_OFF clj

INLINE_STRIKE_ON clj

ITALIC clj

justify clj

(justify s width)

(justify s width justify-last?)

Word-wrap s to width columns, then FULL-JUSTIFY every line, leaving each paragraph's final line left-aligned (the standard typographic convention). Pass justify-last? true to stretch the final line too. Returns a vec of lines.

justify-line clj

(justify-line line width)

Full-justify the words on line to EXACTLY width display columns by distributing inter-word spaces (flush to both margins). A blank or single-word line is left-aligned (right-padded) instead — nothing to stretch.

MARK_ACTION clj

MARK_VALUE clj

MARKER_ANSWER_HDR clj

MARKER_ANSWER_PAD clj

MARKER_ANSWER_SEP clj

MARKER_ANSWER_TXT clj

MARKER_CODE clj

MARKER_CODE_ERR clj

MARKER_CODE_ERR_PAD clj

MARKER_CODE_OK clj

MARKER_CODE_OK_PAD clj

MARKER_CODE_PAD clj

MARKER_DURATION clj

MARKER_ERR_RESULT clj

MARKER_HINT clj

MARKER_ITERATION_HDR clj

MARKER_ITERATION_PAD clj

MARKER_MD_BOLD clj

MARKER_MD_BULLET clj

MARKER_MD_CODE clj

MARKER_MD_H1 clj

MARKER_MD_H2 clj

MARKER_MD_H3 clj

MARKER_MD_HR clj

MARKER_MD_QUOTE clj

MARKER_MD_SUMMARY clj

MARKER_MD_TABLE_HEAD clj

MARKER_MD_TABLE_ROW clj

MARKER_MD_TABLE_SEP clj

MARKER_OP_ROW clj

MARKER_QUEUE_BORDER clj

MARKER_QUEUE_HDR clj

MARKER_QUEUE_ITEM clj

MARKER_RECAP clj

MARKER_RESULT clj

MARKER_SEP clj

MARKER_TH_MD_BOLD clj

MARKER_TH_MD_BULLET clj

MARKER_TH_MD_CODE clj

MARKER_TH_MD_H1 clj

MARKER_TH_MD_H2 clj

MARKER_TH_MD_H3 clj

MARKER_TH_MD_HR clj

MARKER_TH_MD_QUOTE clj

MARKER_TH_MD_SUMMARY clj

MARKER_TH_MD_TABLE_HEAD clj

MARKER_TH_MD_TABLE_ROW clj

MARKER_TH_MD_TABLE_SEP clj

MARKER_THINKING clj

pad-left clj

(pad-left s w)

Pad string to w terminal columns, left-filling with spaces. Truncates (column-aware) if too wide.

pad-right clj

(pad-right s w)

Pad string to w terminal columns, right-filling with spaces. Truncates (column-aware) if too wide.

paint-styled-line! clj

(paint-styled-line! g x y line base-fg base-bg code-fg code-bg)

Paint a single line at (x, y) honouring inline span sentinels.

The line may contain interleaved text and INLINE_*_ON/OFF sentinels (range \uE110...\uE117). Sentinels themselves are NEVER painted; they toggle the SGR style (BOLD/ITALIC/CROSSED-OUT) or the fg/bg colors (CODE) for the spans that follow.

base-fg / base-bg are the colors used for non-code spans. Code spans force code-fg / code-bg until INLINE_CODE_OFF.

Robustness contract:

• Walks by GRAPHEME CLUSTER (lanterna's TextCharacter/fromString), so column tracking is exact for emoji + CJK.
• INHERITS any SGR modifiers already enabled on g at entry (e.g. a wrapping (p/styled g [p/ITALIC] ...) for blockquotes). Inline toggles STACK on top of the inherited set: > **bold** inside a quote renders as bold-italic, not bold-without-italic. The pre-fix version called clearModifiers at entry and silently dropped the wrapping italic - user-visible bug on every blockquote that contained inline emphasis.
• Unmatched / dangling sentinels (e.g. an OFF without a prior ON, or a line that ends mid-bold) are tolerated: at exit we restore exactly the inherited modifier set, so SGR state never leaks past the call.
• When NO sentinel appears in the line this collapses to a single put-str! call - the same as the old non-styled path - so the hot path is not penalised for the common case.

This is the entry point that lets the markdown renderer support bold / italic / ~~strike~~ / code mid-line without replacing the marker-prefix-per-line architecture above.

put-str! clj

(put-str! g col row text)

Draw a string at (col, row). Control characters are sanitized.

REVERSE clj

selection-prefix clj

(selection-prefix selected?)

Return the leading marker string for a list/menu row.

Use this for rows where the marker can be inlined into the body text (simple list items, checkbox rows, slash-command rows). For rows where the marker must live OUTSIDE a fixed-column body (file/session pickers, provider/model cards) call draw-selection-marker! from the caller's row loop instead.

SELECTION_BLANK clj

SELECTION_GLYPH clj

Two-col selection marker. Selected rows show •+space, unselected rows show two spaces, so the body content stays column-aligned.

The glyph MUST be display-width 1 so glyph+space == 2 cols and exactly fills the reserved gutter. • (U+2022) is East-Asian ambiguous width; the lanterna fork (>= 3.1.5-vis.7) scores EAW=A as NARROW by default, so • is 2 cols. (A regression in vis.6 briefly made it wide — the 'marker eats a character' bug.)

SELECTION_WIDTH clj

set-bg! clj

(set-bg! g color)

set-char! clj

(set-char! g col row ch)

Draw a single character at (col, row).

set-colors! clj

(set-colors! g fg bg)

Set both foreground and background color in one call.

set-fg! clj

(set-fg! g color)

space-around clj

(space-around items w)

Distribute items across w terminal columns with equal space around each item. Like CSS justify-content: space-around.

space-between clj

(space-between items w)

Distribute items across w terminal columns with equal gaps. First item flush-left, last item flush-right, rest evenly spaced. Like CSS justify-content: space-between.

status-mark! clj

(status-mark! g col row glyph fg bg)

Paint a 1-col status glyph in colour fg on bg at (col,row) and return the next col (col + STATUS_WIDTH) so the caller can place the label right after. The reusable mark behind settings rows + resource rows.

STATUS_OFF clj

STATUS_ON clj

STATUS_WIDTH clj

styled clj macro

(styled g styles & body)

Draw with styles temporarily enabled. Restores previous styles after body. Usage: (styled g [BOLD ITALIC] (put-str! g 0 0 "hello"))

tab-at clj

(tab-at layout col)

Return the tab geometry under col, or nil. Expects tab-layout output.

tab-display-label clj

(tab-display-label {:keys [id label dirty? state]})

Compact label for a tab map.

Supported tab keys:

• :label / :id - visible base label.
• :dirty? - appends a dirty marker.
• :state - appends a compact state badge for running / verified / accepted / error tabs.

This is terminal-column aware when later passed through tab-layout, so callers may use emoji or CJK labels without hand-padding.

tab-layout clj

(tab-layout tabs left width active-id)

(tab-layout tabs left width active-id {:keys [gap]})

Return tab geometry for a horizontal tab strip.

tabs is a seq of maps. Returned maps include :left, :width, :active?, and :text truncated to fit :width. Width math uses terminal columns, not Java chars. When the strip is too narrow, later tabs may get zero width; draw helpers skip those safely.

truncate-cols clj

(truncate-cols s max-cols)

Return the longest prefix of s that fits in at most max-cols terminal columns, never splitting a grapheme cluster.

Edge cases honoured:

• nil or max-cols <= 0 returns "".
• If a double-width grapheme would straddle the cut, it is dropped (NOT half-included), and one space is appended in its place so the returned string's display-width is exactly max-cols. This keeps pad-right / pad-left idempotent under repeated truncation.

UNDERLINE clj

underline-cell! clj

(underline-cell! g col row)

(underline-cell! g col row fg)

Add the UNDERLINE modifier to the SINGLE already-painted cell at (col,row), preserving its glyph + background. Reads the cell back via getCharacter and re-sets it with the modifier folded in, so callers can paint a PER-COLUMN border (a steady / marching underline) that the global enable!/UNDERLINE attribute — which would underline every cell touched after it — can't express. No-op when the cell is empty/off-screen.

3-arity keeps the cell's own foreground (the underline inherits it). 4-arity RECOLOURS the foreground to fg first, so the underline — which a terminal draws in the cell's foreground colour — renders in fg. Recolour is uniform across blank padding AND glyph cells, giving ONE consistent underline shape/weight everywhere (no block-glyph vs SGR-line mismatch).

v-center-offset clj

(v-center-offset content-h container-h)

Compute vertical offset to center content-h rows within container-h rows.

with-style clj

(with-style g styles body-fn)

Execute body-fn (fn [g] ...) with the given styles enabled, then restore. Returns the result of body-fn.

word-wrap clj

(word-wrap s width)

Greedy word-wrap s into a vec of lines, each fitting width DISPLAY columns. Breaks on whitespace; a token wider than width is hard-split at grapheme boundaries (never mid-cluster); embedded newlines are honoured. Blank input or width <= 0 yields [""].