nvim: after/ftplugin/C: Do not run gst-indent after buffer save

This seems to interfere with git signs tracking among other things.
While at it move the remaining configuration to Lua.

nvim/.config/nvim/after/ftplugin/c.lua

@@ -2,3 +2,8 @@ local lsp_utils     = require('lsp-utils')
 local clangd_config = lsp_utils.clangd_config()
 
 vim.lsp.start(clangd_config)
+
+vim.bo.makeprg = 'meson compile -C build'
+
+vim.keymap.set('n', 'gh', ":ClangdSwitchSourceHeader<CR>", { noremap=true, buffer=0 })
+vim.keymap.set('n', 'gq', ":!gst-indent %<CR>"           , { noremap=true, buffer=0 })

nvim/.config/nvim/after/ftplugin/c.vim

@@ -1,12 +0,0 @@
-setlocal makeprg=ninja\ -C\ build
-
-nmap <buffer> <silent> gh :ClangdSwitchSourceHeader<CR>
-
-" If we are working with any of the gstreamer projects in C, run gst-ident
-" before saving. Assume gst-ident from gstreamer/tools/gst-indent has been
-" made available in path.
-"
-" The '!' after autocmd is required without which, the command gets triggered
-" multiple times. Basically, we clear the autocmd.
-autocmd! BufWritePost */gst-*/*.c call c#format_with_gst_indent()
-autocmd! BufWritePost */gstreamer-*/*.c call c#format_with_gst_indent()

nvim/.config/nvim/autoload/c.vim

@@ -1,5 +0,0 @@
-function! c#format_with_gst_indent() abort
-  let file = expand('%:p')
-  silent execute "!gst-indent " . file
-  silent execute "e" . file
-endfunction