Add command to ban user of latest message

scripts/telegram.coffee

@@ -25,6 +25,17 @@ module.exports = (robot) ->
   # format a name as telegram-cli likes it
   norm = (x) -> x.replace /\ /g, '_'
 
+  # return a list of every match for a regex
+  match_all = (regex, str) ->
+    matches = []
+    str.replace regex, ->
+      arr = [].slice.call arguments, 0
+      extras = arr.splice -2
+      arr.index = extras[0]
+      arr.input = extras[1]
+      matches.push arr
+    matches
+
   # directly run a command in telegram-cli and return its output
   # (a list of strings)
   run_command = (command, callback) ->
@@ -107,6 +118,17 @@ module.exports = (robot) ->
           return callback reply[1..]
         callback()
 
+  # get the messages history for a chat group
+  get_history = (chat, size, callback) ->
+    regex = /\[(.+)\] (.+) [>«»]+ ((?:(?!\n(\[|\d))[\s\S])+)/g
+    parse_line = (x) ->
+      date: x[1]
+      peer: x[2].replace(chat, '').trim()
+      text: x[3].trim().replace '\n', ' '
+    run_command "history #{norm chat} #{size}", (lines) ->
+      callback ((match_all regex, lines.join '\n').map parse_line)
+
+
   robot.respond /chi sei/, (res) ->
     robot_info (user) ->
       username = if user.username? then " noto anche come #{user.username}" else ''
@@ -133,7 +155,7 @@ module.exports = (robot) ->
       else
         res.send "fatto!"
 
-  robot.respond /banna (.+)/, (res) ->
+  robot.respond /banna(lo| (.+))/, (res) ->
     ok   = [', ora non sarai più un problema', ' terminato',
             ' non farti più vedere', ', questa è la tua fine'
     unk  = ['non so chi sia', 'chi?', 'mai sentito', 'sicuro? non lo trovo']
@@ -141,36 +163,57 @@ module.exports = (robot) ->
     nope = ['eh, mi piacerebbe molto ma non posso', 'i have no powers here',
             'nope, non l\'invitato io', 'non sono admin qui, sorry']
 
+    resolve_name = (name, chat, history) ->
+      if name?
+        # find the closest match
+        dists = [].concat.apply [], (
+          for user in chat.members
+            for word in [user].concat user.split ' '
+              [(lev.get name, word), user] )
+        [dist, name] = dists.reduce (x, y) ->
+          if x[0] < y[0] then x else y
+        
+        return if dist < 4  then name else null
+      else
+        # use the latest message peer
+        return history[0].peer
+
+    delete_user = (user, chat) ->
+      run_command "chat_del_user #{chat.id} #{user.id}", (reply) ->
+        err = (reply[0].split ' ')[-1..][0]
+        robot.logger.info "delete user #{user.name} from chat #{chat.name}"
+
+        if err is 'SUCCESS'
+          robot.logger.info 'user deleted'
+          res.send user.name + res.random ok
+        else if err is 'CHAT_ADMIN_REQUIRED'
+          res.send res.random nope
+          robot.logger.warning 'cannot delete user: not authorized'
+        else
+          robot.logger.error 'error:\n' + reply.join '\n'
+          res.send 'oh no: c\'è stato un errore, non so'
+
     if res.message.room.match /^user/
       return res.send 'non è un gruppo questo'
+
     chat_info res.message.room, (chat) ->
-      dists = [].concat.apply [], (
-        for user in chat.members
-          for word in [user].concat user.split ' '
-            [(lev.get res.match[1], word), user])
-      [dist, name] = dists.reduce (x, y) -> if x[0] < y[0] then x else y
+      get_history chat.name, 2, (history) ->
+        robot_info (self) ->
+          name = resolve_name(res.match[2], chat, history)
 
-      if dist < 4
-        user_info name, (user) ->
-          run_command "chat_del_user #{chat.id} #{user.id}", (reply) ->
-            err = (reply[0].split ' ')[-1..][0]
-            robot.logger.info "delete user #{user.name} from chat #{chat.name}"
+          if not name?
+            return res.send res.random unk 
+          if name in [res.message.user.name, self.name]
+            return res.send 'ma sei scemo o cosa?'
 
-            if err is 'SUCCESS'
-              robot.logger.info 'user deleted'
-              res.send user.name + res.random ok
-            else if err is 'CHAT_ADMIN_REQUIRED'
-              res.send res.random nope
-              robot.logger.warning 'cannot delete user: not authorized'
-            else
-              robot.logger.error 'error:\n' + reply.join '\n'
-              res.send 'oh no: c\'è stato un errore, non so'
-      else
-        res.send res.random unk
+          user_info name, (user) ->
+            delete_user user, chat
 
   robot.respond /(mi )?invit(i|ami) (in|nel gruppo) ([^?]+)\??/, (res) ->
-    denied = ['BZBZ ADMIN-NOT-DETECTED', 'BZBZ IS-NOT-AUTHORIZED', 'BZBZ ACCESS-DENIED']
-    nope   = ['ahahah NO', 'mai sentito questo', 'invita anche me magari', 'che?']
+    denied = ['BZBZ ADMIN-NOT-DETECTED', 'BZBZ IS-NOT-AUTHORIZED',
+              'BZBZ ACCESS-DENIED']
+    nope   = ['ahahah NO', 'mai sentito questo', 'invita anche me magari',
+              'che?']
     ok     = ['provvedo subito', 'ok', 'certo', 'va bene']
     done   = ['fatto', 'ecco qui', 'ecco fatto']