Add full tools support to the chat template

This PR is still in progress! It should work, but it needs testing to verify it exactly matches the outputs of `mistral-common`.

tokenizer_config.json

@@ -6173,7 +6173,7 @@
     }
   },
   "bos_token": "<s>",
-  "chat_template": "{%- 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{{- bos_token }}\n{%- for message in loop_messages %}\n    {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}\n        {{- raise_exception('After the optional system message, conversation roles must alternate user/assistant/user/assistant/...') }}\n    {%- endif %}\n    {%- if message['role'] == 'user' %}\n        {%- if loop.last and system_message is defined %}\n            {{- '[INST] ' + system_message + '\\n\\n' + message['content'] + '[/INST]' }}\n        {%- else %}\n            {{- '[INST] ' + message['content'] + '[/INST]' }}\n        {%- endif %}\n    {%- elif message['role'] == 'assistant' %}\n        {{- ' ' + message['content'] + eos_token}}\n    {%- else %}\n        {{- raise_exception('Only user and assistant roles are supported, with the exception of an initial optional system message!') }}\n    {%- endif %}\n{%- endfor %}\n",
+  "chat_template": "{%- 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{%- if not tools is defined %}\n    {%- set tools = none %}\n{%- endif %}\n{%- set user_messages = loop_messages | selectattr('role', 'equalto', 'user') | list %}\n\n{%- for message in loop_messages | rejectattr(\"role\", \"equalto\", \"tool\") | rejectattr(\"role\", \"equalto\", \"tool_results\") | selectattr(\"tool_calls\", \"undefined\") %}\n    {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}\n        {{- raise_exception('After the optional system message, conversation roles must alternate user/assistant/user/assistant/...') }}\n    {%- endif %}\n{%- endfor %}\n\n{{- bos_token }}\n{%- for message in loop_messages %}\n    {%- if message['role'] == 'user' %}\n        {%- if tools is not none and (message == user_messages[-1]) %}\n            {{- '[AVAILABLE_TOOLS] [' }}\n            {%- for tool in tools %}\n\t\t{%- set tool = tool.function %}\n\t\t{{- \"{'type': 'function', 'function': {\" }}\n\t\t{%- for key, val in tool.items() if key != \"return\" %}\n\t\t    {%- if val is string %}\n\t\t\t{{- \"'\" + key + \"': '\" + val + \"'\" }}\n\t\t    {%- else %}\n\t\t\t{{- \"'\" + key + \"': \" + val|string }}\n\t\t    {%- endif %}\n\t\t    {%- if not loop.last %}\n\t\t\t{{- \", \" }}\n\t\t    {%- endif %}\n\t\t{%- endfor %}\n\t\t{{- \"}}\" }}\n                {%- if not loop.last %}\n                    {{- \", \" }}\n                {%- else %}\n                    {{- \"]\" }}\n                {%- endif %}\n            {%- endfor %}\n            {{- '[/AVAILABLE_TOOLS]' }}\n            {%- endif %}\n        {%- if loop.last and system_message is defined %}\n            {{- '[INST] ' + system_message + '\\n\\n' + message['content'] + '[/INST]' }}\n        {%- else %}\n            {{- '[INST] ' + message['content'] + '[/INST]' }}\n        {%- endif %}\n    {%- elif message['role'] == 'tool_calls' or message.tool_calls is defined %}\n        {%- if message.tool_calls is defined %}\n            {%- set tool_calls = message.tool_calls %}\n        {%- else %}\n            {%- set tool_calls = message.content %}\n        {%- endif %}\n        {{- '[TOOL_CALLS]' + tool_calls|string + eos_token }}\n    {%- elif message['role'] == 'assistant' %}\n        {{- ' ' + message['content'] + eos_token}}\n    {%- elif message['role'] == 'tool_results' or message['role'] == 'tool' %}\n    \t{%- if message.content is defined and message.content.content is defined %}\n    \t    {%- set content = message.content.content %}\n    \t{%- else %}\n    \t    {%- set content = message.content %}\n    \t{%- endif %}\n        {{- '[TOOL_RESULTS]{\"content\": ' + content|string + '}[/TOOL_RESULTS]' }}\n    {%- else %}\n        {{- raise_exception('Only user and assistant roles are supported, with the exception of an initial optional system message!') }}\n    {%- endif %}\n{%- endfor %}\n",
   "clean_up_tokenization_spaces": false,
   "eos_token": "</s>",
   "legacy": false,