examples : simplify vim plugin (#2327)

Uses builtin json_encode and json_decode functions to simplify escaping
Removes the need for temp files

Author: AustinMroz

examples/llm.vim

@@ -2,57 +2,22 @@ function! Llm()
 
   let url = "http://127.0.0.1:8080/completion"
 
-  " Save the current cursor position
-  let save_cursor = getpos('.')
-
-  silent! %s/\n/\\n/g
-  silent! %s/\t/\\t/g
-  silent! %s/\\n$//
-
   " Get the content of the current buffer
   let buffer_content = join(getline(1, '$'), "\n")
 
-  " Replace true newlines with "\n"
-  let buffer_content = substitute(buffer_content, '\n', '\\n', 'g')
-
-  " Trim leading/trailing whitespace
-  let buffer_content = substitute(buffer_content, '^\s\+', '', '')
-  let buffer_content = substitute(buffer_content, '\s\+$', '', '')
-
   " Create the JSON payload
-  " can't escape backslash, \n gets replaced as \\n
-  let json_payload = '{"prompt":"' . escape(buffer_content, '"/') . '","temp":0.72,"top_k":100,"top_p":0.73,"repeat_penalty":1.100000023841858,"n_predict":10,"stream":false}'
-
-  let prompt_tmpfile = tempname()
-  let response_tmpfile = tempname()
-  call writefile([json_payload], prompt_tmpfile)
+  let json_payload = {"temp":0.72,"top_k":100,"top_p":0.73,"repeat_penalty":1.100000023841858,"n_predict":10,"stream": v:false}
+  let json_payload.prompt = buffer_content
 
   " Define the curl command
-  let curl_command = 'curl -k -s -X POST -H "Content-Type: application/json" -o ' . shellescape(response_tmpfile) . ' -d @' . shellescape(prompt_tmpfile) . ' ' . url
-  silent execute '!'.curl_command
-
-  let response = join(readfile(response_tmpfile), '')
-  let start_marker = '{"content":"'
-  let end_marker = '","generation_settings'
-  let content_start = stridx(response, start_marker) + len(start_marker)
-  let content_end = stridx(response, end_marker, content_start)
+  let curl_command = 'curl -k -s -X POST -H "Content-Type: application/json" -d @- ' . url
+  let response = system(curl_command, json_encode(json_payload))
 
   " Extract the content field from the response
-  let content = strpart(response, content_start, content_end - content_start)
+  let content = json_decode(response).content
 
   " Insert the content at the cursor position
   call setline(line('.'), getline('.') . content)
-
-  " Replace newline "\n" strings with actual newlines in the content
-  silent! %s/\\n/\r/g
-  " and tabs
-  silent! %s/\\t/\t/g
-  " and quote marks for C sources
-  silent! %s/\\"/\"/g
-
-  " Remove the temporary file
-  call delete(prompt_tmpfile)
-  call delete(response_tmpfile)
 endfunction
 
 command! Llm call Llm()