cargo-tally 1.0.22

Cargo subcommand for drawing graphs of the number of dependencies on a crate over time
Documentation 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <script src="https://d3js.org/d3.v7.min.js"></script>
  <style>
    body {
      font: 14px sans-serif;
    }
    .axis path, .axis line {
      shape-rendering: crispEdges;
    }
    .line {
      fill: none;
      stroke-width: 1.5px;
    }
    svg {
      overflow: visible;
    }
  </style>
</head>
<body>
  <script>
    var data = CARGO_TALLY_DATA;

    var margin = { top: 20, right: 100, bottom: 30, left: 50 };
    var width = 950 - margin.left - margin.right;
    var height = 500 - margin.top - margin.bottom;

    var x = d3.scaleTime().range([0, width]);
    var y = d3.scaleLinear().range([height, 0]);
    var color = d3.scaleOrdinal(d3.schemeCategory10);
    var xAxis = d3.axisBottom(x);
    var yAxis = d3.axisLeft(y);

    var line = d3.line()
      .x(function(d) {
        return x(d.time);
      })
      .y(function(d) {
        return y(d.edges);
      });

    color.domain(data.map(function(dataset) {
      return dataset.name;
    }));

    data.forEach(function(dataset) {
      dataset.values.forEach(function(d) {
        d.time = new Date(d.time);
      });
    });
    
    var minDate = d3.min(data, function(dataset) {
      return dataset.values[0].time;
    });
    var maxDate = d3.max(data, function(dataset) {
      return dataset.values[dataset.values.length - 1].time;
    });
    var maxValue = d3.max(data, function(c) {
      return d3.max(c.values, function(v) {
        return v.edges;
      });
    });
    x.domain([(21 * minDate - maxDate) / 20, maxDate]);
    y.domain([0, 1.025 * maxValue]);

#if CARGO_TALLY_RELATIVE
    // NOTE The ticks should be read only after setting the domain values on `y`
    var stepSize = y.ticks()[1] - y.ticks()[0]
    var yFormatter = d3.format(`.${Math.max(0, d3.precisionFixed(stepSize) - 2)}%`);
    var tooltipFormatter = d3.format(`.${Math.max(1, d3.precisionFixed(stepSize / 10) - 2)}%`);
#else
    var yFormatter = d3.format(",");
    var tooltipFormatter = d3.format(",");
#endif
    yAxis.tickFormat(yFormatter);

    var svg = d3.select("body")
      .append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      .append("g")
      .attr("transform", `translate(${margin.left} ${margin.top})`);

    var filter = svg.append("defs")
      .append("filter")
      .attr("x", "0")
      .attr("y", "0")
      .attr("width", "1")
      .attr("height", "1")
      .attr("id", "solid");
    filter.append("feFlood")
      .attr("flood-color", "white");
    filter.append("feComposite")
      .attr("in", "SourceGraphic");

    var legend = svg.selectAll()
      .data(data)
      .enter()
      .append("g");

    legend.append("rect")
      .attr("x", 50)
      .attr("y", function(d, i) {
        return i * 20;
      })
      .attr("width", 10)
      .attr("height", 10)
      .style("fill", function(d) {
        return color(d.name);
      });

    legend.append("text")
      .attr("x", 64)
      .attr("y", function(d, i) {
        return (i * 20) + 9;
      })
      .text(function(d) {
        return d.name;
      });

    svg.append("g")
      .attr("class", "x axis")
      .attr("transform", `translate(0 ${height})`)
      .call(xAxis);

    svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);

    svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text(CARGO_TALLY_TITLE);

    var curve = svg.selectAll()
      .data(data)
      .enter()
      .append("g");

    curve.append("path")
      .attr("class", "line")
      .attr("d", function(d) {
        return line(d.values);
      })
      .style("stroke", function(d) {
        return color(d.name);
      })
      .style("stroke-linejoin", "round");

    curve.append("text")
      .attr("transform", function(d) {
        var last = d.values[d.values.length - 1];
        return `translate(${x(last.time)} ${y(last.edges)})`;
      })
      .attr("x", 3)
      .attr("dy", ".35em")
      .text(function(d) {
        return d.name;
      });

    var mouseG = svg.append("g")
      .style("opacity", "0");

    mouseG.append("path") // this is the black vertical line to follow mouse
      .style("stroke", "black")
      .style("stroke-width", "1px")
      .attr("d", `M0 ${height + xAxis.tickSize()} 0 0`);

    var mouseDate = mouseG.append("text")
      .attr("y", height + 9)
      .attr("dy", "0.71em")
      .attr("text-anchor", "middle")
      .attr("filter", "url(#solid)");

    var mousePerLine = mouseG.selectAll()
      .data(data)
      .enter()
      .append("g")
      .attr("class", "mouse-per-line");

    mousePerLine.append("circle")
      .attr("r", 7)
      .style("stroke", function(d) {
        return color(d.name);
      })
      .style("fill", "none")
      .style("stroke-width", "1px");

    mousePerLine.append("text")
      .attr("x", -6)
      .attr("y", -4)
      .style("text-anchor", "end");

    svg.append("rect") // append a rect to catch mouse movements on canvas
      .attr("width", width) // can't catch mouse events on a g element
      .attr("height", height + xAxis.tickSize() + 16)
      .attr("fill", "none")
      .attr("pointer-events", "all")
      .on("mouseout", function() { // on mouse out hide line, circles and text
        mouseG.style("opacity", "0");
      })
      .on("mouseover", function() { // on mouse in show line, circles and text
        mouseG.style("opacity", "1");
      })
      .on("mousemove", function(event) { // mouse moving over canvas
        var mouse = d3.pointer(event);
        mouseG.attr("transform", `translate(${mouse[0]} 0)`);
        mousePerLine.attr("transform", function(d, i) {
          var xDate = x.invert(mouse[0]);
          var bisect = d3.bisector(function(d) { return d.time; }).right;
          var idx = bisect(d.values, xDate);
          var below = d.values[idx - (idx > 0)];
          var above = d.values[idx - (idx == d.values.length)];
          var interp = below.time == above.time ? 0 : (xDate - below.time) / (above.time - below.time);
          var val = d3.interpolateNumber(below.edges, above.edges)(interp);

          d3.select(this)
            .style("opacity", below.edges ? "1" : "0")
            .select("text")
            .text(tooltipFormatter(below.edges));

          mouseDate.text(d3.timeFormat("%b %-d")(xDate));

          return `translate(0 ${y(val)})`;
        });
      });
  </script>
</body>
</html>