From 2d2c9599253a1efc372391bac447ad07c6dcc818 Mon Sep 17 00:00:00 2001
From: Fedor Katurov <gotham48@gmail.com>
Date: Sat, 30 Dec 2023 13:26:30 +0700
Subject: [PATCH] added links trimmer

---
 src/service/template/index.ts             | 22 ++++++++++++++--------
 src/service/vk/handlers/PostNewHandler.ts | 11 +++++------
 src/utils/transformMDLinks.ts             | 10 ++++++++++
 3 files changed, 29 insertions(+), 14 deletions(-)
 create mode 100644 src/utils/transformMDLinks.ts

diff --git a/src/service/template/index.ts b/src/service/template/index.ts
index 5c84c78..c1e5e46 100644
--- a/src/service/template/index.ts
+++ b/src/service/template/index.ts
@@ -9,6 +9,7 @@ import path from "path";
 import hb from "handlebars";
 import strip from "strip-markdown";
 import { VFileCompatible } from "vfile";
+import transformMDLinks from "../../utils/transformMDLinks";
 
 const removeFrontmatter = () => (tree) => {
   tree.children = tree.children.filter((item) => item.type !== "yaml");
@@ -50,7 +51,8 @@ export class Template<
   }
 
   /**
-   * Themes the template with values
+   * Themes the template with values, removes markdown from template.
+   * NOTE: text, that we'll insert into template, won't be used here
    */
   public theme = (values: V, markdown?: boolean) => {
     const processor = unified()
@@ -81,13 +83,17 @@ export class Template<
     });
   }
 
-  public static cleanText(text: string) {
-    return unified()
-      .use(stringify)
-      .use(parser)
-      .use(strip)
-      .processSync(text)
-      .contents.toString();
+  /** Cleans text from markdown, but transforms links to MD if needed */
+  public static cleanText(text: string, markdown?: boolean) {
+    const processor = unified().use(stringify).use(parser).use(strip);
+
+    const output = processor.processSync(text).contents.toString();
+
+    if (markdown) {
+      return transformMDLinks(output);
+    }
+
+    return output;
   }
 }
 
diff --git a/src/service/vk/handlers/PostNewHandler.ts b/src/service/vk/handlers/PostNewHandler.ts
index 8bb9d39..4bef70f 100644
--- a/src/service/vk/handlers/PostNewHandler.ts
+++ b/src/service/vk/handlers/PostNewHandler.ts
@@ -363,17 +363,16 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
     type?: string,
     user?: UsersUserFull,
     markdown?: boolean
-  ): string => {
-    return this.template.theme(
+  ) =>
+    this.template.theme(
       {
         user,
         group: this.group,
         type,
-        text: Template.cleanText(text),
+        text: Template.cleanText(text, markdown),
       },
       markdown
     );
-  };
 
   /**
    * Calculates, how much should we cut off the text to match photo caption limitations
@@ -384,7 +383,7 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
     type?: string,
     user?: UsersUserFull,
     markdown?: boolean
-  ): string => {
+  ) => {
     const withText = this.themeText(text, type, user, markdown);
     const limit = this.template.fields.char_limit
       ? Math.min(this.template.fields.char_limit, maxChars)
@@ -410,7 +409,7 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
   /**
    * Returns fullname from user of update callback
    */
-  getNameFromContext = (from: User): string =>
+  getNameFromContext = (from: User) =>
     [from?.first_name, from?.last_name, from.username && `(@${from.username})`]
       .filter((el) => el)
       .join(" ")
diff --git a/src/utils/transformMDLinks.ts b/src/utils/transformMDLinks.ts
new file mode 100644
index 0000000..2b036bc
--- /dev/null
+++ b/src/utils/transformMDLinks.ts
@@ -0,0 +1,10 @@
+const urlRegex = /(https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|www\.[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9]+\.[^\s]{2,}|www\.[a-zA-Z0-9]+\.[^\s]{2,})/g;
+
+const trimTo = (val: string, maxLength: number) =>
+  val.length > maxLength ? val.substring(0, maxLength - 1).concat("…") : val;
+
+/** Formatting all links in markdown output, trimming them to reasonable length */
+export default (value: string) =>
+  value.replace(urlRegex, (val) => {
+    return `[${trimTo(val, 20)}](${val})`;
+  });