Handle multiline results on the UI

lib/project/results-model.js

@@ -5,16 +5,57 @@ const escapeHelper = require('../escape-helper')
 class Result {
   static create (result) {
     if (result && result.matches && result.matches.length) {
-      const matches = result.matches.map(m =>
-        ({
-          matchText: m.matchText,
-          lineText: m.lineText,
-          lineTextOffset: m.lineTextOffset,
-          range: Range.fromObject(m.range),
-          leadingContextLines: m.leadingContextLines,
-          trailingContextLines: m.trailingContextLines
-        })
-      )
+      const matches = []
+
+      for (const m of result.matches) {
+        const range = Range.fromObject(m.range)
+        const matchSplit = m.matchText.split('\n')
+        const linesSplit = m.lineText.split('\n')
+
+        // If the result spans across multiple lines, process each of
+        // them separately by creating separate `matches` objects for
+        // each line on the match.
+        for (let row = range.start.row; row <= range.end.row; row++) {
+          const lineText = linesSplit[row - range.start.row]
+          const matchText = matchSplit[row - range.start.row]
+
+          // When receiving multiline results from opened buffers, only
+          // the first result line is provided on the `lineText` property.
+          // This makes it impossible to properly render the part of the result
+          // that's part of other lines.
+          // In order to prevent an error we just need to ignore these parts.
+          if (lineText === undefined || matchText === undefined) {
+            continue
+          }
+
+          // Adapt the range column number based on which line we're at:
+          // - the first line of a multiline result will always start at the range start
+          //   and will end at the end of the line.
+          // - middle lines will start at 0 and end at the end of the line
+          // - last line will start at 0 and end at the range end.
+          const startColumn = row === range.start.row ? range.start.column : 0
+          const endColumn = row === range.end.row ? range.end.column : lineText.length - 1
+
+          matches.push({
+            matchText,
+            lineText,
+            lineTextOffset: m.lineTextOffset,
+            range: {
+              start: {
+                row,
+                column: startColumn
+              },
+              end: {
+                row,
+                column: endColumn
+              }
+            },
+            leadingContextLines: m.leadingContextLines,
+            trailingContextLines: m.trailingContextLines
+          })
+        }
+      }
+
       return new Result({filePath: result.filePath, matches})
     } else {
       return null