Clear User Channel History Command (#88)

* Add: Clear user channel message history command

* Update: Checks if messages are empty and has clearer replies

* Fix: Issue where duplication happens on channel-toggle true in threads

* Update: version increment

* Fix: Missing test case for commands.test.ts

* Readability fix

---------

Co-authored-by: Jonathan Smoley <67881240+JT2M0L3Y@users.noreply.github.com>

src/utils/handlers/chatHistoryHandler.ts

@@ -58,6 +58,61 @@ export async function getThread(filename: string, callback: (config: Thread | un
     }
 }
 
+/**
+ * Method to check if a thread history file exists
+ * 
+ * @param channel parent thread of the requested thread (can be GuildText)
+ * @returns true if channel does not exist, false otherwise
+ */
+async function checkChannelInfoExists(channel: TextChannel, user: string) {
+    // thread exist handler
+    const isThread: boolean = await new Promise((resolve) => {
+        getThread(`${channel.id}-${user}.json`, (channelInfo) => {
+            if (channelInfo?.messages)
+                resolve(true)
+            else
+                resolve(false)
+        })
+    })
+    return isThread
+}
+
+/**
+ * Method to clear channel history for requesting user
+ * 
+ * @param filename guild id string
+ * @param channel the TextChannel in the Guild
+ * @param user username of user
+ * @returns nothing
+ */
+export async function clearChannelInfo(filename: string, channel: TextChannel, user: string): Promise<boolean> {
+    const channelInfoExists: boolean = await checkChannelInfoExists(channel, user)
+
+    // If thread does not exist, file can't be found
+    if (!channelInfoExists) return false
+
+    // Attempt to clear user channel history
+    const fullFileName = `data/${filename}-${user}.json`
+    const cleanedHistory: boolean = await new Promise((resolve) => {
+        fs.readFile(fullFileName, 'utf8', (error, data) => {
+            if (error)
+                console.log(`[Error: openChannelInfo] Incorrect file format`)
+            else {
+                const object = JSON.parse(data)
+                if (object['messages'].length === 0) // already empty, let user know
+                    resolve(false)
+                else {
+                    object['messages'] = [] // cleared history
+                    fs.writeFileSync(fullFileName, JSON.stringify(object, null, 2))
+                    resolve(true)
+                }
+            }
+        })
+    })
+    console.log(cleanedHistory)
+    return cleanedHistory
+}
+
 /**
  * Method to open the channel history
  * 
@@ -67,7 +122,6 @@ export async function getThread(filename: string, callback: (config: Thread | un
  * @param messages their messages
  */
 export async function openChannelInfo(filename: string, channel: TextChannel, user: string, messages: UserMessage[] = []): Promise<void> {
-    // thread exist handler
     const isThread: boolean = await new Promise((resolve) => {
         getThread(`${channel.id}.json`, (threadInfo) => {
             if (threadInfo?.messages)
@@ -77,7 +131,7 @@ export async function openChannelInfo(filename: string, channel: TextChannel, us
         })
     })
 
-    // This is an existing thread, don't create another json
+    // this is a thread channel, do not duplicate files
     if (isThread) return
 
     const fullFileName = `data/${filename}-${user}.json`