Vim Locale File Highlighter is a software that highlights locale input files in ISO TR 14652 format.
If you're looking for a tool to highlight only valid keys with various LC sections or flag bad < UNNNN > unicode as an error, then look no further than the Locale file highlighter for Vim.
To install this handy tool, simply copy the file to your .vim/syntax directory in a locale file type. After installation, set syntax=fdcc to get started.
Filetype detection can be somewhat challenging since locale files lack any specific suffix. However, you can insert the following code after the Diff section in your scripts.vim file to do initial pattern matching and then search within the file to determine if it's a locale file. Make sure to remove any escaped quotes when transferring the code over.
Finally, if you're looking for a powerful and reliable tool to work with your Glibc files, the Locale file highlighter for Vim is definitely worth checking out.
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