I have .zsh-theme files (from oh-my-zsh), but they are not syntax highlighted. I was able to get this done pretty easily with
autocmd BufEnter *.zsh-theme set filetype=sh
However, before I did that I tried adding a vim meta comment for a specific file
#vim: set filetype=sh
The addition of the # apparently makes vim detect the file as a conf file, but it seems that this command is ignored (i.e. it is not detected as a sh file in spite of the comment). Is there any reason this may be happening?
Get rid of the word set (and add a space after the comment symbol)
# vim: filetype=sh
This fits with the first form of modelines
There are two forms of modelines. The first form:
[text]{white}{vi:|vim:|ex:}[white]{options}
[text] any text or empty
{white} at least one blank character (<Space> or <Tab>)
{vi:|vim:|ex:} the string "vi:", "vim:" or "ex:"
[white] optional white space
{options} a list of option settings, separated with white space
or ':', where each part between ':' is the argument
for a ":set" command (can be empty)