1 files changed, 57 insertions, 0 deletions
diff --git a/app/assets/javascripts/vue_shared/components/line_numbers.vue b/app/assets/javascripts/vue_shared/components/line_numbers.vue
new file mode 100644
index 00000000000..7e17cca3dcc
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/line_numbers.vue
@@ -0,0 +1,57 @@
+<script>
+import { GlIcon, GlLink } from '@gitlab/ui';
+
+export default {
+  components: {
+    GlIcon,
+    GlLink,
+  },
+  props: {
+    lines: {
+      type: Number,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      currentlyHighlightedLine: null,
+    };
+  },
+  mounted() {
+    this.scrollToLine();
+  },
+  methods: {
+    scrollToLine(hash = window.location.hash) {
+      const lineToHighlight = hash && this.$el.querySelector(hash);
+
+      if (!lineToHighlight) {
+        return;
+      }
+
+      if (this.currentlyHighlightedLine) {
+        this.currentlyHighlightedLine.classList.remove('hll');
+      }
+
+      lineToHighlight.classList.add('hll');
+      this.currentlyHighlightedLine = lineToHighlight;
+      lineToHighlight.scrollIntoView({ behavior: 'smooth', block: 'center' });
+    },
+  },
+};
+</script>
+<template>
+  <div class="line-numbers">
+    <gl-link
+      v-for="line in lines"
+      :id="`L${line}`"
+      :key="line"
+      class="diff-line-num"
+      :href="`#L${line}`"
+      :data-line-number="line"
+      @click="scrollToLine(`#L${line}`)"
+    >
+      <gl-icon :size="12" name="link" />
+      {{ line }}
+    </gl-link>
+  </div>
+</template>