Markdown support for TextPreviews (#396)

* add markdown-to-jsx dependency

* replace TextPreview with Markdown

* basic table styling

* add light mode backgroundColor

frontend/package-lock.json

@@ -22,6 +22,7 @@
         "file-saver": "^2.0.5",
         "jose": "^4.14.4",
         "jwt-decode": "^3.1.2",
+        "markdown-to-jsx": "^7.4.1",
         "mime-types": "^2.1.35",
         "moment": "^2.29.4",
         "next": "^13.4.12",
@@ -6100,6 +6101,17 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/markdown-to-jsx": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/markdown-to-jsx/-/markdown-to-jsx-7.4.1.tgz",
+      "integrity": "sha512-GbrbkTnHp9u6+HqbPRFJbObi369AgJNXi/sGqq5HRsoZW063xR1XDCaConqq+whfEIAlzB1YPnOgsPc7B7bc/A==",
+      "engines": {
+        "node": ">= 10"
+      },
+      "peerDependencies": {
+        "react": ">= 0.14.0"
+      }
+    },
     "node_modules/merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
@@ -13250,6 +13262,12 @@
         }
       }
     },
+    "markdown-to-jsx": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/markdown-to-jsx/-/markdown-to-jsx-7.4.1.tgz",
+      "integrity": "sha512-GbrbkTnHp9u6+HqbPRFJbObi369AgJNXi/sGqq5HRsoZW063xR1XDCaConqq+whfEIAlzB1YPnOgsPc7B7bc/A==",
+      "requires": {}
+    },
     "merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",

frontend/package.json

@@ -23,6 +23,7 @@
     "file-saver": "^2.0.5",
     "jose": "^4.14.4",
     "jwt-decode": "^3.1.2",
+    "markdown-to-jsx": "^7.4.1",
     "mime-types": "^2.1.35",
     "moment": "^2.29.4",
     "next": "^13.4.12",

frontend/src/components/share/FilePreview.tsx

@@ -1,9 +1,10 @@
-import { Button, Center, Stack, Text, Title } from "@mantine/core";
+import { Button, Center, Stack, Text, Title, useMantineTheme } from "@mantine/core";
 import { modals } from "@mantine/modals";
 import Link from "next/link";
 import React, { Dispatch, SetStateAction, useEffect, useState } from "react";
 import { FormattedMessage } from "react-intl";
 import api from "../../services/api.service";
+import Markdown from "markdown-to-jsx";
 
 const FilePreviewContext = React.createContext<{
   shareId: string;
@@ -115,22 +116,40 @@ const ImagePreview = () => {
 
 const TextPreview = () => {
   const { shareId, fileId } = React.useContext(FilePreviewContext);
-  const [text, setText] = useState<string | null>(null);
+  const [ text, setText ] = useState<string>("");
+  const { colorScheme } = useMantineTheme();
 
   useEffect(() => {
     api
       .get(`/shares/${shareId}/files/${fileId}?download=false`)
-      .then((res) => setText(res.data));
+      .then((res) => setText(res.data ?? "Preview couldn't be fetched."));
-  }, [shareId, fileId]);
+  }, [ shareId, fileId ]);
+
+  const options = {
+    overrides: {
+      pre: {
+        props: {
+          style: {
+            backgroundColor: colorScheme == "dark"
+              ? "rgba(50, 50, 50, 0.5)"
+              : "rgba(220, 220, 220, 0.5)",
+            padding: "0.75em",
+            whiteSpace: "pre-wrap",
+          }
+        }
+      },
+      table: {
+        props: {
+          className: "md"
+        }
+      }
+    }
+  };
 
   return (
-    <Center style={{ minHeight: 200 }}>
+    <Markdown options={options}>
-      <Stack align="center" spacing={10} style={{ width: "100%" }}>
-        <Text sx={{ whiteSpace: "pre-wrap" }} size="sm">
       {text}
-        </Text>
+    </Markdown>
-      </Stack>
-    </Center>
   );
 };
 

frontend/src/styles/global.style.tsx

@@ -3,11 +3,20 @@ import { Global } from "@mantine/core";
 const GlobalStyle = () => {
   return (
     <Global
-      styles={() => ({
+      styles={(theme) => ({
         a: {
           color: "inherit",
           textDecoration: "none",
         },
+        "table.md, table.md th:nth-of-type(odd), table.md td:nth-of-type(odd)": {
+          background: theme.colorScheme == "dark"
+            ? "rgba(50, 50, 50, 0.5)"
+            : "rgba(220, 220, 220, 0.5)",
+        },
+        "table.md td": {
+          paddingLeft: "0.5em",
+          paddingRight: "0.5em",
+        },
       })}
     />
   );