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What is the difference between pop-to-buffer-same-window and switch-to-buffer?

switch-to-buffer-other-window is basically an alias for pop-to-buffer, so I'm surprised that pop-to-buffer-same-window is not basically an alias for switch-to-buffer.

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    Please look at the doc-string for each function at issue and edit your question if you still have any questions regarding the differences between each function. M-x describe-function or C-h f. If you are really curious, then use M-x find-function to visit the source-code. In addition, please look at the doc-strings for the other functions mentioned in the question -- including the one that you believe is an alias. – lawlist Oct 11 '16 at 6:03
  • I've looked at the doc-string and source code, thanks. If I'd figured it out from that, I wouldn't have posted the question. And yes, I know switch-to-buffer-other-window not a real "alias" for pop-to-buffer, just a thin wrapper--that's why I said "basically". – Tianxiang Xiong Oct 11 '16 at 6:32
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    Please specify just what is unclear to you, after having read the doc, as specifically as possible. – Drew Oct 11 '16 at 15:07
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    switch-to-buffer opens a buffer in the current window. pop-to-buffer opens a buffer in a different window. switch-to-buffer-other-window is a thin wrapper around ("alias" for) pop-to-buffer. So why isn't pop-to-buffer-same-window similarly a thin wrapper around ("alias" for) switch-to-buffer? – Tianxiang Xiong Oct 12 '16 at 6:34
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The difference is that pop-to-buffer-same-window doesn't insist as much about using the same window.

Historically, switch-to-buffer has been used for 2 purposes:

  • change which buffer is shown in the selected window.
  • display the specified buffer.

In many cases you can do both at the same time, but in some cases you have to choose between the two (e.g. when the selected-window is a minibuffer window). switch-to-buffer cares more about the first, while pop-to-buffer-same-window cares more about the second.

Personally I recommend you stay away from switch-to-buffer in Elisp code (in 99% of the cases where I see switch-to-buffer in Elisp code, the code will misbehave when used with my config). Better use pop-to-buffer-same-window or use set-window-buffer depending on your specific needs.

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