## Summary
Add an optional `--group` argument to `export-users`.
When `--group` is not provided, the command keeps the original behavior and exports all Canvas users as:
`name,sis_id,login_id`
When `--group <group_set_prefix>` is provided, the command looks up the corresponding Canvas group set, exports only users in that group set, and appends the normalized group name as the fourth column:
`name,sis_id,login_id,group_name`
For example, if the group set is `p2team`, the exported group names will be formatted as `p2team01`, `p2team02`, `p2team10`, etc.
## Changes
- Add optional `--group` support to `export-users`
- Look up Canvas group sets by exact name first, then by prefix
- Export only members in the matched group set when `--group` is used
- Append the user's group name as the fourth CSV column
- Normalize Canvas group names like `p1team 1` and `p1team10` into `p1team01` and `p1team10`
- Sort exported rows by group number in ascending order
- Handle invalid input more gracefully:
- if no matching group set is found, exit cleanly with an error log
- if a Canvas group name does not follow the expected `group_set_name + number` pattern, exit cleanly with an error log
## Behavior
### Default
`joint-teapot export-users students.csv`
Output format:
`name,sis_id,login_id`
### With group export
`joint-teapot export-users p2.csv --group p2team`
Output format:
`name,sis_id,login_id,p2team01`
## Notes
This change keeps the original export behavior unchanged unless `--group` is explicitly provided.
Reviewed-on: #7
Reviewed-by: 张泊明518370910136 <bomingzh@sjtu.edu.cn>
Co-authored-by: egghead_yao <egghead_yao@sjtu.edu.cn>
Co-committed-by: egghead_yao <egghead_yao@sjtu.edu.cn>
