ariel-rs 0.2.0

A faithful Rust port of Mermaid JS — headless SVG diagram rendering without a browser
Documentation 
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//! SVG template functions for the git graph renderer.
//!
//! Each function takes typed parameters and returns a `String`.
//! No rendering logic lives here — only string formatting.
#![allow(dead_code)]

// ---------------------------------------------------------------------------
// Utilities
// ---------------------------------------------------------------------------

pub use crate::diagrams::util::esc;

// ---------------------------------------------------------------------------
// CSS
// ---------------------------------------------------------------------------

pub fn build_style(id: &str, ff: &str) -> String {
    format!(
        concat!(
            "#{id}{{font-family:{ff};font-size:16px;fill:#333;}}",
            "#{id} p{{margin:0;}}",
            "#{id} .commit-id,#{id} .commit-msg,#{id} .branch-label{{fill:lightgrey;color:lightgrey;font-family:{ff};}}",
            "#{id} .branch{{stroke-width:1;stroke:#333333;stroke-dasharray:2;}}",
            "#{id} .commit-label{{font-size:10px;fill:#000021;}}",
            "#{id} .commit-label-bkg{{font-size:10px;fill:#ffffde;opacity:0.5;}}",
            "#{id} .tag-label{{font-size:10px;fill:#131300;}}",
            "#{id} .tag-label-bkg{{fill:#ECECFF;stroke:hsl(240, 60%, 86.2745098039%);}}",
            "#{id} .tag-hole{{fill:#333;}}",
            "#{id} .commit-merge{{stroke:#ECECFF;fill:#ECECFF;}}",
            "#{id} .commit-reverse{{stroke:#ECECFF;fill:#ECECFF;stroke-width:3;}}",
            "#{id} .commit-highlight-inner{{stroke:#ECECFF;fill:#ECECFF;}}",
            "#{id} .arrow{{stroke-width:8;stroke-linecap:round;fill:none;}}",
            "#{id} .gitTitleText{{text-anchor:middle;font-size:18px;fill:#333;}}",
            "#{id} :root{{--mermaid-font-family:{ff};}}"
        ),
        id = id, ff = ff
    )
}

// ---------------------------------------------------------------------------
// Top-level SVG structure
// ---------------------------------------------------------------------------

/// Render the outer SVG wrapper for a git graph.
pub fn svg_root(id: &str, w: f64, h: f64) -> String {
    format!(
        concat!(
            r#"<svg id="{id}" xmlns="http://www.w3.org/2000/svg""#,
            r#" width="100%" height="{h:.1}" viewBox="0 0 {w:.1} {h:.1}""#,
            r#" style="max-width: {w:.1}px;""#,
            r#" role="graphics-document document" aria-roledescription="git-graph">"#
        ),
        id = id,
        w = w,
        h = h,
    )
}

// ---------------------------------------------------------------------------
// Arrow marker
// ---------------------------------------------------------------------------

/// Render the `<defs>` block with arrowhead marker for git graph edges.
pub fn arrowhead_defs(id: &str) -> String {
    format!(
        "<defs><marker id=\"{id}-arrowhead\" markerWidth=\"10\" markerHeight=\"7\" refX=\"10\" refY=\"3.5\" orient=\"auto\"><polygon points=\"0 0, 10 3.5, 0 7\" fill=\"#333\"/></marker></defs>",
        id = id,
    )
}

// ---------------------------------------------------------------------------
// Branch rendering (LR mode)
// ---------------------------------------------------------------------------

/// Render a branch spine line for LR (horizontal) mode.
pub fn branch_spine_lr(y: f64, max_pos: f64) -> String {
    format!(
        "<line x1=\"0\" y1=\"{y:.1}\" x2=\"{mx:.1}\" y2=\"{y:.1}\" stroke=\"#333333\" stroke-width=\"1\" stroke-dasharray=\"2\"/>",
        y = y, mx = max_pos,
    )
}

/// Render a branch label background rectangle for LR mode.
pub fn branch_label_rect_lr(bx: f64, by: f64, bw: f64, fill: &str) -> String {
    format!(
        concat!(
            r#"<rect x="{bx:.1}" y="{by:.1}" width="{bw:.1}" height="20""#,
            r#" rx="4" ry="4" fill="{f}"/>"#
        ),
        bx = bx,
        by = by,
        bw = bw,
        f = fill,
    )
}

/// Render a branch label text for LR mode.
pub fn branch_label_text_lr(tx: f64, ty: f64, tc: &str, ff: &str, name: &str) -> String {
    format!(
        "<text x=\"{tx:.1}\" y=\"{ty:.1}\" font-size=\"16\" fill=\"{tc}\" font-family=\"{ff}\" text-anchor=\"start\">{name}</text>",
        tx = tx, ty = ty, tc = tc, ff = ff, name = name,
    )
}

// ---------------------------------------------------------------------------
// Branch rendering (TB mode)
// ---------------------------------------------------------------------------

/// Render a branch spine line for TB (vertical) mode.
pub fn branch_spine_tb(x: f64, default_pos: f64, max_pos: f64, stroke: &str) -> String {
    format!(
        concat!(
            r#"<line x1="{x:.1}" y1="{dp:.1}" x2="{x:.1}" y2="{mx:.1}""#,
            r#" stroke="{s}" stroke-width="2" stroke-dasharray="4 2"/>"#
        ),
        x = x,
        dp = default_pos,
        mx = max_pos,
        s = stroke,
    )
}

/// Render a branch label background rectangle for TB mode.
pub fn branch_label_rect_tb(bx: f64, bw: f64, fill: &str, stroke: &str) -> String {
    format!(
        concat!(
            r#"<rect x="{bx:.1}" y="0" width="{bw:.1}" height="20""#,
            r#" rx="4" fill="{f}" stroke="{s}" stroke-width="1"/>"#
        ),
        bx = bx,
        bw = bw,
        f = fill,
        s = stroke,
    )
}

/// Render a branch label text for TB mode.
pub fn branch_label_text_tb(tx: f64, ff: &str, name: &str) -> String {
    format!(
        "<text x=\"{tx:.1}\" y=\"14\" font-size=\"14\" fill=\"#333\" font-family=\"{ff}\" text-anchor=\"start\">{name}</text>",
        tx = tx, ff = ff, name = name,
    )
}

// ---------------------------------------------------------------------------
// Branch rendering (BT mode)
// ---------------------------------------------------------------------------

/// Render a branch spine line for BT (bottom-to-top) mode.
pub fn branch_spine_bt(x: f64, default_pos: f64, max_pos: f64, stroke: &str) -> String {
    format!(
        concat!(
            r#"<line x1="{x:.1}" y1="{dp:.1}" x2="{x:.1}" y2="{mx:.1}""#,
            r#" stroke="{s}" stroke-width="2" stroke-dasharray="4 2"/>"#
        ),
        x = x,
        dp = default_pos,
        mx = max_pos,
        s = stroke,
    )
}

/// Render a branch label background rectangle for BT mode.
pub fn branch_label_rect_bt(bx: f64, my: f64, bw: f64, fill: &str, stroke: &str) -> String {
    format!(
        concat!(
            r#"<rect x="{bx:.1}" y="{my:.1}" width="{bw:.1}" height="20""#,
            r#" rx="4" fill="{f}" stroke="{s}" stroke-width="1"/>"#
        ),
        bx = bx,
        my = my,
        bw = bw,
        f = fill,
        s = stroke,
    )
}

/// Render a branch label text for BT mode.
pub fn branch_label_text_bt(tx: f64, ty: f64, ff: &str, name: &str) -> String {
    format!(
        "<text x=\"{tx:.1}\" y=\"{ty:.1}\" font-size=\"14\" fill=\"#333\" font-family=\"{ff}\" text-anchor=\"start\">{name}</text>",
        tx = tx, ty = ty, ff = ff, name = name,
    )
}

// ---------------------------------------------------------------------------
// Arrow path
// ---------------------------------------------------------------------------

/// Render an arrow connecting two commits.
pub fn commit_arrow(d: &str, ci: usize, stroke: &str, branch_idx: usize) -> String {
    format!(
        "<path d=\"{d}\" class=\"arrow arrow{ci}\" fill=\"none\" stroke=\"{s}\" stroke-width=\"8\" stroke-linecap=\"round\"/>",
        d = d, s = stroke, ci = branch_idx % ci, // note: ci arg is THEME_COLOR_LIMIT
    )
}

// ---------------------------------------------------------------------------
// Commit bullets
// ---------------------------------------------------------------------------

/// Render a highlight commit outer rectangle.
pub fn commit_highlight_outer(x: f64, y: f64, fill: &str, stroke: &str) -> String {
    format!(
        r#"<rect x="{:.1}" y="{:.1}" width="20" height="20" rx="2" fill="{}" stroke="{}" stroke-width="2"/>"#,
        x, y, fill, stroke,
    )
}

/// Render a highlight commit inner rectangle.
pub fn commit_highlight_inner(x: f64, y: f64, fill: &str, stroke: &str) -> String {
    format!(
        r#"<rect x="{:.1}" y="{:.1}" width="12" height="12" rx="1" fill="{}" stroke="{}" stroke-width="1"/>"#,
        x, y, fill, stroke,
    )
}

/// Render a normal/merge/reverse commit circle.
pub fn commit_circle(cx: f64, cy: f64, r: f64, fill: &str, stroke: &str, id: &str) -> String {
    format!(
        r#"<circle cx="{:.1}" cy="{:.1}" r="{:.1}" fill="{}" stroke="{}" stroke-width="2" class="commit commit-{}"/>"#,
        cx, cy, r, fill, stroke, id,
    )
}

/// Render the merge inner circle (white overlay).
pub fn commit_merge_inner(cx: f64, cy: f64, id: &str) -> String {
    format!(
        "<circle cx=\"{:.1}\" cy=\"{:.1}\" r=\"6\" class=\"commit-merge commit{}\" stroke=\"#ECECFF\" fill=\"#ECECFF\"/>",
        cx, cy, id,
    )
}

/// Render the reverse commit X-cross path.
pub fn commit_reverse_cross(cx: f64, cy: f64, c: f64) -> String {
    format!(
        "<path d=\"M {:.1},{:.1}L{:.1},{:.1}M{:.1},{:.1}L{:.1},{:.1}\" stroke=\"#fff\" stroke-width=\"2\"/>",
        cx - c, cy - c, cx + c, cy + c,
        cx - c, cy + c, cx + c, cy - c,
    )
}

/// Render a cherry-pick commit base circle.
pub fn commit_cherry_circle(cx: f64, cy: f64, r: f64, fill: &str, stroke: &str) -> String {
    format!(
        r#"<circle cx="{:.1}" cy="{:.1}" r="{:.1}" fill="{}" stroke="{}" stroke-width="2"/>"#,
        cx, cy, r, fill, stroke,
    )
}

/// Render a cherry-pick eye circle (white inner dot).
pub fn commit_cherry_eye(cx: f64, cy: f64) -> String {
    format!(
        "<circle cx=\"{:.1}\" cy=\"{:.1}\" r=\"2.75\" fill=\"#fff\"/>",
        cx, cy,
    )
}

/// Render a cherry-pick stem line.
pub fn commit_cherry_stem(x1: f64, y1: f64, x2: f64, y2: f64) -> String {
    format!(
        "<line x1=\"{:.1}\" y1=\"{:.1}\" x2=\"{:.1}\" y2=\"{:.1}\" stroke=\"#fff\" stroke-width=\"1.5\"/>",
        x1, y1, x2, y2,
    )
}

// ---------------------------------------------------------------------------
// Commit labels
// ---------------------------------------------------------------------------

/// Render the commit label group wrapper (LR mode, rotated).
pub fn commit_label_group_lr(tx: f64, ty: f64, rx: f64, ry: f64) -> String {
    format!(
        "<g transform=\"translate({tx:.3},{ty:.3}) rotate(-45,{rx:.3},{ry:.3})\">",
        tx = tx,
        ty = ty,
        rx = rx,
        ry = ry,
    )
}

/// Render a commit label background rectangle.
pub fn commit_label_bkg(rect_x: f64, rect_y: f64, rect_w: f64) -> String {
    format!(
        "<rect class=\"commit-label-bkg\" x=\"{:.3}\" y=\"{:.3}\" width=\"{:.3}\" height=\"15\"/>",
        rect_x, rect_y, rect_w,
    )
}

/// Render the commit label text.
pub fn commit_label_text(text_x: f64, text_y: f64, label: &str) -> String {
    format!(
        "<text x=\"{:.3}\" y=\"{:.3}\" class=\"commit-label\">{}</text>",
        text_x, text_y, label,
    )
}

/// Render a commit label background rectangle (TB/BT mode).
pub fn commit_label_bkg_tb(lx: f64, ly: f64, lw: f64, lh: f64) -> String {
    format!(
        "<rect class=\"commit-label-bkg\" x=\"{:.1}\" y=\"{:.1}\" width=\"{:.1}\" height=\"{:.1}\"/>",
        lx, ly, lw, lh,
    )
}

/// Render a commit label text (TB/BT mode).
pub fn commit_label_text_tb(lx: f64, ly: f64, ff: &str, label: &str) -> String {
    format!(
        "<text x=\"{:.1}\" y=\"{:.1}\" font-size=\"10\" fill=\"#000021\" font-family=\"{ff}\" class=\"commit-label\">{}</text>",
        lx, ly, label, ff = ff,
    )
}

// ---------------------------------------------------------------------------
// Tag badges (LR mode)
// ---------------------------------------------------------------------------

/// Render a tag badge polygon (price-tag shape) for LR mode.
#[allow(clippy::too_many_arguments)]
pub fn tag_badge_polygon(x0: f64, yb: f64, yt: f64, bl: f64, br: f64, bt: f64, bb: f64) -> String {
    format!(
        "<polygon class=\"tag-label-bkg\" points=\"{x0:.3},{yb:.3} {x0:.3},{yt:.3} {bl:.3},{bt:.3} {br:.3},{bt:.3} {br:.3},{bb:.3} {bl:.3},{bb:.3}\" fill=\"#ECECFF\" stroke=\"hsl(240, 60%, 86.2745098039%)\" stroke-width=\"1\"/>",
        x0=x0, yb=yb, yt=yt, bl=bl, br=br, bt=bt, bb=bb,
    )
}

/// Render the hole circle on a tag badge.
pub fn tag_hole_circle(cy: f64, cx: f64) -> String {
    format!(
        "<circle cy=\"{:.3}\" cx=\"{:.3}\" r=\"1.5\" class=\"tag-hole\" fill=\"#333\"/>",
        cy, cx,
    )
}

/// Render the tag text label.
pub fn tag_text_lr(y: f64, x: f64, ff: &str, text: &str) -> String {
    format!(
        "<text y=\"{:.3}\" class=\"tag-label\" x=\"{:.3}\" font-size=\"10\" fill=\"#131300\" font-family=\"{ff}\">{}</text>",
        y, x, text, ff = ff,
    )
}

// ---------------------------------------------------------------------------
// Tag badges (TB/BT mode)
// ---------------------------------------------------------------------------

/// Render a tag badge rectangle for TB/BT mode.
pub fn tag_badge_rect_tb(tx: f64, ty: f64, tw: f64) -> String {
    format!(
        "<rect x=\"{:.1}\" y=\"{:.1}\" width=\"{:.1}\" height=\"14\" rx=\"2\" fill=\"#ffffe0\" stroke=\"#cc9900\" stroke-width=\"1\"/>",
        tx - 2.0, ty - 7.0, tw + 4.0,
    )
}

/// Render a tag text label for TB/BT mode.
pub fn tag_text_tb(tx: f64, ty: f64, ff: &str, text: &str) -> String {
    format!(
        "<text x=\"{:.1}\" y=\"{:.1}\" font-size=\"10\" fill=\"#333\" font-family=\"{ff}\">{}</text>",
        tx, ty, text, ff = ff,
    )
}