fix(plugins/lines): handle no history data

.github/workflows/examples.yml

@@ -289,7 +289,6 @@ jobs:
             @use.patterns
             */*
             +lowlighter/metrics
-            +lowlighter/brain
           output_action: none
           delay: 120
           user: lowlighter

source/plugins/lines/examples.yml

@@ -20,4 +20,3 @@
       @use.patterns
       */*
       +lowlighter/metrics
-      +lowlighter/brain

source/plugins/lines/index.mjs

@@ -71,54 +71,60 @@ export default async function({login, data, imports, rest, q, account}, {enabled
 
     //Diff graphs
     if (sections.includes("history")) {
-      //Generate SVG
-      const height = 315, width = 480
-      const margin = 5, offset = 34
-      const {d3} = imports
       const weeks = result.weeks.filter(({date}) => !_history_limit ? true : new Date(date) > new Date(new Date().getFullYear() - _history_limit, 0, 0))
-      const d3n = new imports.D3node()
-      const svg = d3n.createSVG(width, height)
+      if (weeks.length) {
+        //Generate SVG
+        const height = 315, width = 480
+        const margin = 5, offset = 34
+        const {d3} = imports
+        const d3n = new imports.D3node()
+        const svg = d3n.createSVG(width, height)
 
-      //Time range
-      const start = new Date(weeks.at(0).date)
-      const end = new Date(weeks.at(-1).date)
-      const x = d3.scaleTime()
-        .domain([start, end])
-        .range([margin + offset, width - (offset + margin)])
-      svg.append("g")
-        .attr("transform", `translate(0,${height - (offset + margin)})`)
-        .call(d3.axisBottom(x))
-        .selectAll("text")
-        .attr("transform", "translate(-5,5) rotate(-45)")
-        .style("text-anchor", "end")
-        .style("font-size", 20)
+        //Time range
+        const start = new Date(weeks.at(0).date)
+        const end = new Date(weeks.at(-1).date)
+        const x = d3.scaleTime()
+          .domain([start, end])
+          .range([margin + offset, width - (offset + margin)])
+        svg.append("g")
+          .attr("transform", `translate(0,${height - (offset + margin)})`)
+          .call(d3.axisBottom(x))
+          .selectAll("text")
+          .attr("transform", "translate(-5,5) rotate(-45)")
+          .style("text-anchor", "end")
+          .style("font-size", 20)
 
-      //Diff range
-      const points = weeks.flatMap(({added, deleted, changed}) => [added + changed, deleted + changed])
-      const extremum = Math.max(...points)
-      const y = d3.scaleLinear()
-        .domain([extremum, -extremum])
-        .range([margin, height - (offset + margin)])
-      svg.append("g")
-        .attr("transform", `translate(${margin + offset},0)`)
-        .call(d3.axisLeft(y).ticks(7).tickFormat(d3.format(".2s")))
-        .selectAll("text")
-        .style("font-size", 20)
+        //Diff range
+        const points = weeks.flatMap(({added, deleted, changed}) => [added + changed, deleted + changed])
+        const extremum = Math.max(...points)
+        const y = d3.scaleLinear()
+          .domain([extremum, -extremum])
+          .range([margin, height - (offset + margin)])
+        svg.append("g")
+          .attr("transform", `translate(${margin + offset},0)`)
+          .call(d3.axisLeft(y).ticks(7).tickFormat(d3.format(".2s")))
+          .selectAll("text")
+          .style("font-size", 20)
 
-      //Generate history
-      for (const {type, sign, fill} of [{type: "added", sign: +1, fill: "rgb(63, 185, 80)"}, {type: "deleted", sign: -1, fill: "rgb(218, 54, 51)"}]) {
-        svg.append("path")
-          .datum(weeks.map(({date, ...diff}) => [new Date(date), sign * (diff[type] + diff.changed)]))
-          .attr(
-            "d",
-            d3.area()
-              .x(d => x(d[0]))
-              .y0(d => y(d[1]))
-              .y1(() => y(0)),
-          )
-          .attr("fill", fill)
+        //Generate history
+        for (const {type, sign, fill} of [{type: "added", sign: +1, fill: "rgb(63, 185, 80)"}, {type: "deleted", sign: -1, fill: "rgb(218, 54, 51)"}]) {
+          svg.append("path")
+            .datum(weeks.map(({date, ...diff}) => [new Date(date), sign * (diff[type] + diff.changed)]))
+            .attr(
+              "d",
+              d3.area()
+                .x(d => x(d[0]))
+                .y0(d => y(d[1]))
+                .y1(() => y(0)),
+            )
+            .attr("fill", fill)
+        }
+        result.history = d3n.svgString()
+      }
+      else {
+        console.debug(`metrics/compute/${login}/plugins > lines > no history data`)
+        result.history = null
       }
-      result.history = d3n.svgString()
     }
 
     //Results

tests/cases/lines.plugin.yml

@@ -18,6 +18,5 @@
       @use.patterns
       */*
       +lowlighter/metrics
-      +lowlighter/brain
     use_mocked_data: 'yes'
     verify: 'yes'