Add arguments to restrict to Channel and between timestamps

- Add Optional CHANNEL_ID env

.env.example

@@ -0,0 +1,3 @@
+SLACK_USER_TOKEN = xoxp-
+# Uncomment Channel ID to use for all exports
+#CHANNEL_ID =

exporter.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import os
 import sys
 import requests
@@ -110,11 +111,13 @@ def channel_list(team_id=None, response_url=None):
     )
 
 
-def channel_history(channel_id, response_url=None):
+def channel_history(channel_id, response_url=None, oldest=None, latest=None):
     params = {
         # "token": os.environ["SLACK_USER_TOKEN"],
         "channel": channel_id,
         "limit": 200,
+        "oldest": oldest,
+        "latest": latest,
     }
 
     return paginated_get(
@@ -344,6 +347,15 @@ if __name__ == "__main__":
     parser.add_argument(
         "-c", action="store_true", help="Get history for all accessible conversations"
     )
+    parser.add_argument(
+        "--ch", help="Restrict to given Channel ID"
+    )
+    parser.add_argument(
+        "--fr", help="Unix timestamp for earliest message"
+    )
+    parser.add_argument(
+        "--to", help="Unix timestamp for latest message"
+    )
     parser.add_argument(
         "-r",
         action="store_true",
@@ -389,21 +401,10 @@ if __name__ == "__main__":
             data_replies = "%s\n%s\n\n%s" % (header_str, sep, data_replies)
         save(data_replies, "channel-replies_%s" % channel_id)
 
-    if a.lc:
+    def save_channel(ch_id, ch_list, users):
-        data = (
+        ts_fr = a.fr
-            channel_list()
+        ts_to = a.to
-            if a.json
+        ch_hist = channel_history(ch_id, oldest=ts_fr, latest=ts_to)
-            else parse_channel_list(channel_list(), user_list())
-        )
-        save(data, "channel_list")
-    if a.lu:
-        data = user_list() if a.json else parse_user_list(user_list())
-        save(data, "user_list")
-    if a.c:
-        ch_list = channel_list()
-        users = user_list()
-        for ch_id in [x["id"] for x in ch_list]:
-            ch_hist = channel_history(ch_id)
         if a.json:
             data_ch = ch_hist
         else:
@@ -419,6 +420,26 @@ if __name__ == "__main__":
         save(data_ch, "channel_%s" % ch_id)
         if a.r:
             save_replies(ch_hist, ch_id, users)
+
+    if a.lc:
+        data = (
+            channel_list()
+            if a.json
+            else parse_channel_list(channel_list(), user_list())
+        )
+        save(data, "channel_list")
+    if a.lu:
+        data = user_list() if a.json else parse_user_list(user_list())
+        save(data, "user_list")
+    if a.c:
+        ch_id = a.ch if a.ch else (os.environ["CHANNEL_ID"] if "CHANNEL_ID" in os.environ else None)
+        ch_list = channel_list()
+        users = user_list()
+        if ch_id:
+            save_channel(ch_id, ch_list, users)
+        else:
+            for ch_id in [x["id"] for x in ch_list]:
+                save_channel(ch_id, ch_list, users)
     # elif, since we want to avoid asking for channel_history twice
     elif a.r:
         for ch_id in [x["id"] for x in channel_list()]: