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I work on a range of JavaScript projects. In most of these projects, the indentation of JavaScript files is 2 spaces, so I've set my default indentation width to that. However it becomes 1 or 4 in some other projects.
Is there a way to ask Vim to change the indentation style based on the style already used in the current file?
Install this plugin: tpope/vim-sleuth
ciaranm/detectindent might be what you're looking for. It's unmaintained (last updated in 2015, there was also a fork that was last updated in 2016: roryokane/detectindent) and I haven't used it, but looks like it does what you want:
A Vim plugin, for automatically detecting indent settings. This plugin adds a :DetectIndent command, which tries to intelligently set the 'shiftwidth', 'expandtab' and 'tabstop' options based upon the existing settings in use in the active file.
:au BufEnter *.js :set shiftwidth=2. This works for all projects,*.*is just a pattern. You can use filename or path as well. Or, you can use similar auto command like what I gave, for each file. You can instruct the auto command to take the tabwidth of current file and put it for path of this file. Its pretty easy.