This page discusses completing the name of the file in the buffer.  Emacs already has file completion available in the MiniBuffer.

As the documentation in the library of HippieExpand mentions, use the following code by EvaluatingExpressions or by adding it to your InitFile.

  (fset 'my-complete-file-name
        (make-hippie-expand-function '(try-complete-file-name-partially
                                       try-complete-file-name)))

  (global-set-key "\M-/" 'my-complete-file-name)

[new]
When comint.el is loaded, `comint-dynamic-complete-filename' can be used for in-buffer completion. This is only really useful when bound to a key, as it -- being a completion function -- should be called multiple times in a row. For instance, I have

  (global-set-key "\M-\\" 'comint-dynamic-complete-filename)

in my ##~/.emacs## to bind Meta-slash to this function. --NielsGiesen

[new]
Bind the function `comint-dynamic-complete' to a key (say Sh-TAB) and get filename completion in any buffer.  Sometimes its concept of where the filename begins is wrong, but it's ''very'' useful.

See also InsertFileName.

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CategoryCompletion
CategoryFiles