🖋️ Adjust base64 file errors

Author: S0AndS0

autoload/proompter/base64.vim

@@ -2,6 +2,10 @@
 " proompter.vim - Provide integration with local Ollama LLM API
 " Maintainer: S0AndS0 <https://github.com/S0AndS0>
 " URL: https://github.com/vim-utilities/proompter
+"
+" Note: pipes instead of process substitution is necessary to make GitHub
+" Actions play nice with tests, however, for those using the Linux Subsystem
+" on Windows or Cygwin there may be a performance hit :-(
 
 ""
 "
@@ -29,6 +33,11 @@ function! proompter#base64#EncodeFile(path) abort
   if !len(a:path)
     throw 'No path value'
   endif
+
+  if !filereadable(a:path)
+    throw 'Cannot read file -> ' . a:path.
+  endif
+
   let l:path = shellescape(a:path)
   return system('base64 --wrap=0 ' . l:path)
 endfunction
@@ -39,6 +48,11 @@ function! proompter#base64#DecodeToFile(string, path, flags = '') abort
   if !len(a:path)
     throw 'No path value'
   endif
+
+  if !filereadable(a:path)
+    throw 'Cannot read file -> ' . a:path.
+  endif
+
   let l:path = shellescape(a:path)
   let l:string = shellescape(a:string)
   return system('printf "%s" ' . l:string . ' | base64 --decode > ' . l:path)

autoload/proompter/callback/prompt.vim

@@ -30,16 +30,21 @@ endfunction
 " See: {docs} :help readfile()
 function! proompter#callback#prompt#EncodeImagesFromFilePaths(paths, _configurations = g:proompter, _state = g:proompter_state) abort
   let l:encoded_images = []
+  let l:skipped_paths = []
 
   for l:path in a:paths
     if !filereadable(l:path)
-      echow 'Cannot read image ->' l:path
+      call add(l:skipped_paths, l:path)
       continue
     endif
 
     call add(l:encoded_images, proompter#base64#EncodeFile(l:path))
   endfor
 
+  if len(l:skipped_paths)
+    echoe 'l:skipped_paths ->' l:skipped_paths
+  endif
+
   return l:encoded_images
 endfunction