[Bug] Chat Template File name too long

[jrruethe]

If I specify a chat template in the config file:

chat_template: "{% macro render_extra_keys(json_dict, handled_keys) ...

Then on this line, it treats that entire chat template as a file name. For long chat templates, this throws an OSError: [Errno 36] File name too long: '/media/user/backup/llm/mergekit/mergekit/_data/chat_templates/{% macro render_extra_keys(json_dict, handled_keys) ....

I expected it to drop down to this line. Either those two cases need to be reversed, OR allow me to specify my chat template as an external file, like "./my_template.jinja" or assume that "my_template.jinja" is in the same directory as the config file being run.

Here is the full trace:

Traceback (most recent call last):
  File "/media/user/backup/llm/models/Qwen_Qwen3-30B-A3B-Base/other/../../../mergekit/mergekit/scripts/run_yaml.py", line 39, in <module>
    main()
  File "/media/user/backup/llm/mergekit/.venv/lib/python3.12/site-packages/click/core.py", line 1442, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/media/user/backup/llm/mergekit/.venv/lib/python3.12/site-packages/click/core.py", line 1363, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/media/user/backup/llm/mergekit/.venv/lib/python3.12/site-packages/click/core.py", line 1226, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/media/user/backup/llm/mergekit/.venv/lib/python3.12/site-packages/click/core.py", line 794, in invoke
    return callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/media/user/backup/llm/mergekit/mergekit/options.py", line 160, in wrapper
    return f(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^
  File "/media/user/backup/llm/models/Qwen_Qwen3-30B-A3B-Base/other/../../../mergekit/mergekit/scripts/run_yaml.py", line 30, in main
    run_merge(
  File "/media/user/backup/llm/mergekit/mergekit/merge.py", line 119, in run_merge
    _set_chat_template(tokenizer, merge_config)
  File "/media/user/backup/llm/mergekit/mergekit/merge.py", line 193, in _set_chat_template
    ).is_file():
      ^^^^^^^^^
  File "/usr/lib/python3.12/pathlib.py", line 894, in is_file
    return S_ISREG(self.stat().st_mode)
                   ^^^^^^^^^^^
  File "/usr/lib/python3.12/pathlib.py", line 842, in stat
    return os.stat(self, follow_symlinks=follow_symlinks)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 36] File name too long: '/media/user/backup/llm/mergekit/mergekit/_data/chat_templates/{% macro render_extra_keys(json_dict, handled_keys) %}\n    {%- if json_dict is mapping %}\n        {%- for json_key in json_dict if json_key not in handled_keys %}\n            {%- if json_dict[json_key] is mapping or (json_dict[json_key] is sequence and json_dict[json_key] is not string) %}\n                {{- \'\\n<\' ~ json_key ~ \'>\' ~ (json_dict[json_key] | tojson | safe) ~ \'</\' ~ json_key ~ \'>\' }}\n            {%- else %}\n                {{-\'\\n<\' ~ json_key ~ \'>\' ~ (json_dict[json_key] | string) ~ \'</\' ~ json_key ~ \'>\' }}\n            {%- endif %}\n        {%- endfor %}\n    {%- endif %}\n{% endmacro %}\n\n{%- if messages[0]["role"] == "system" %}\n    {%- set system_message = messages[0]["content"] %}\n    {%- set loop_messages = messages[1:] %}\n{%- else %}\n    {%- set loop_messages = messages %}\n{%- endif %}\n\n{%- if not tools is defined %}\n    {%- set tools = [] %}\n{%- endif %}\n\n{%- if system_message is defined %}\n    {{- "<|im_start|>system\\n" + system_message }}\n{%- else %}\n    {%- if tools is iterable and tools | length > 0 %}\n        {{- "<|im_start|>system\\nYou are Blackrose, a helpful AI assistant that can interact with a computer to solve tasks." }}\n    {%- endif %}\n{%- endif %}\n{%- if tools is iterable and tools | length > 0 %}\n    {{- "\\n\\n# Tools\\n\\nYou have access to the following functions:\\n\\n" }}\n    {{- "<tools>" }}\n    {%- for tool in tools %}\n        {%- if tool.function is defined %}\n            {%- set tool = tool.function %}\n        {%- endif %}\n        {{- "\\n<function>\\n<name>" ~ tool.name ~ "</name>" }}\n        {%- if tool.description is defined %}\n            {{- \'\\n<description>\' ~ (tool.description | trim) ~ \'</description>\' }}\n        {%- endif %}\n        {{- \'\\n<parameters>\' }}\n        {%- if tool.parameters is defined and tool.parameters is mapping and tool.parameters.properties is defined and tool.parameters.properties is mapping %}\n            {%- for param_name, param_fields in tool.parameters.properties|items %}\n                {{- \'\\n<parameter>\' }}\n                {{- \'\\n<name>\' ~ param_name ~ \'</name>\' }}\n                {%- if param_fields.type is defined %}\n                    {{- \'\\n<type>\' ~ (param_fields.type | string) ~ \'</type>\' }}\n                {%- endif %}\n                {%- if param_fields.description is defined %}\n                    {{- \'\\n<description>\' ~ (param_fields.description | trim) ~ \'</description>\' }}\n                {%- endif %}\n                {%- set handled_keys = [\'name\', \'type\', \'description\'] %}\n                {{- render_extra_keys(param_fields, handled_keys) }}\n                {{- \'\\n</parameter>\' }}\n            {%- endfor %}\n        {%- endif %}\n        {% set handled_keys = [\'type\', \'properties\'] %}\n        {{- render_extra_keys(tool.parameters, handled_keys) }}\n        {{- \'\\n</parameters>\' }}\n        {%- set handled_keys = [\'type\', \'name\', \'description\', \'parameters\'] %}\n        {{- render_extra_keys(tool, handled_keys) }}\n        {{- \'\\n</function>\' }}\n    {%- endfor %}\n    {{- "\\n</tools>" }}\n    {{- \'\\n\\nIf you choose to call a function ONLY reply in the following format with NO suffix:\\n\\n<tool_call>\\n<function=example_function_name>\\n<parameter=example_parameter_1>\\nvalue_1\\n</parameter>\\n<parameter=example_parameter_2>\\nThis is the value for the second parameter\\nthat can span\\nmultiple lines\\n</parameter>\\n</function>\\n</tool_call>\\n\\n<IMPORTANT>\\nReminder:\\n- Function calls MUST follow the specified format: an inner <function=...></function> block must be nested within <tool_call></tool_call> XML tags\\n- Required parameters MUST be specified\\n- You may provide optional reasoning for your function call in natural language BEFORE the function call, but NOT after\\n- If there is no function call available, answer the question like normal with your current knowledge and do not tell the user about function calls\\n</IMPORTANT>\' }}\n{%- endif %}\n{%- if system_message is defined %}\n    {{- \'<|im_end|>\\n\' }}\n{%- else %}\n    {%- if tools is iterable and tools | length > 0 %}\n        {{- \'<|im_end|>\\n\' }}\n    {%- endif %}\n{%- endif %}\n{%- for message in loop_messages %}\n    {%- if message.role == "assistant" and message.tool_calls is defined and message.tool_calls is iterable and message.tool_calls | length > 0 %}\n        {{- \'<|im_start|>\' + message.role }}\n        {%- if message.content is defined and message.content is string and message.content | trim | length > 0 %}\n            {{- \'\\n\' + message.content | trim + \'\\n\' }}\n        {%- endif %}\n        {%- for tool_call in message.tool_calls %}\n            {%- if tool_call.function is defined %}\n                {%- set tool_call = tool_call.function %}\n            {%- endif %}\n            {{- \'\\n<tool_call>\\n<function=\' + tool_call.name + \'>\\n\' }}\n            {%- if tool_call.arguments is defined %}\n                {%- for args_name, args_value in tool_call.arguments|items %}\n                    {{- \'<parameter=\' + args_name + \'>\\n\' }}\n                    {%- set args_value = args_value | tojson | safe if args_value is mapping or (args_value is sequence and args_value is not string) else args_value | string %}\n                    {{- args_value }}\n                    {{- \'\\n</parameter>\\n\' }}\n                {%- endfor %}\n            {%- endif %}\n            {{- \'</function>\\n</tool_call>\' }}\n        {%- endfor %}\n        {{- \'<|im_end|>\\n\' }}\n    {%- elif message.role == "user" or message.role == "system" or message.role == "assistant" %}\n        {{- \'<|im_start|>\' + message.role + \'\\n\' + message.content + \'<|im_end|>\' + \'\\n\' }}\n    {%- elif message.role == "tool" %}\n        {%- if loop.previtem and loop.previtem.role != "tool" %}\n            {{- \'<|im_start|>user\\n\' }}\n        {%- endif %}\n        {{- \'<tool_response>\\n\' }}\n        {{- message.content }}\n        {{- \'\\n</tool_response>\\n\' }}\n        {%- if not loop.last and loop.nextitem.role != "tool" %}\n            {{- \'<|im_end|>\\n\' }}\n        {%- elif loop.last %}\n            {{- \'<|im_end|>\\n\' }}\n        {%- endif %}\n    {%- else %}\n        {{- \'<|im_start|>\' + message.role + \'\\n\' + message.content + \'<|im_end|>\\n\' }}\n    {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n    {{- \'<|im_start|>assistant\\n\' }}\n{%- endif %}\n.jinja'