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I am using vim 8+ with vim-go and gopls. I have been able to get many of the features that and IDE would offer working such as importing packages on save, etc.

One behaviour I have not been able to replicate however is this the following... enter image description here

The above is a screenshot taken from vscode showing a list of possible options available from the fmt package.

Would love to replicate this functionality, or something similar, in generic vim.

Please let me know how this can be achieved.

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I don't know if this is the "best" solution but this is something I managed to come up with making use of vim's omnicompletion.

function AutoCompleter()
  let previousChar = getline('.')[col('.') - 2]
  if previousChar == '.'
    return "\<c-x>\<c-o>"
  else
    return "\<tab>"
  endif

  return ''
endfunction

inoremap <tab> <c-r>=AutoCompleter()<cr>

This solution creates a function which returns the keystrokes for omnicompletion if the previous character is a .. Then I remap the tab key in insert mode to call this function.

This means that when I press tab in most cases it returns a tab, however, if I press tab after typing a . then I get the following...

enter image description here

In the above screenshot, this brings up the possible options from the fmt package. I can then use CRTL + N, O or P to navigate through the options.

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