When a language server gets attached to a buffer you gain access to some keybindings and commands. All of these are bound to built-in functions, so you can get more details using the :help command.
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K: Displays hover information about the symbol under the cursor in a floating window. See :help vim.lsp.buf.hover(). -
gd: Jumps to the definition of the symbol under the cursor. See :help vim.lsp.buf.definition(). -
gD: Jumps to the declaration of the symbol under the cursor. Some servers don't implement this feature. See :help vim.lsp.buf.declaration(). -
gi: Lists all the implementations for the symbol under the cursor in the quickfix window. See :help vim.lsp.buf.implementation(). -
go: Jumps to the definition of the type of the symbol under the cursor. See :help vim.lsp.buf.type_definition(). -
gr: Lists all the references to the symbol under the cursor in the quickfix window. See :help vim.lsp.buf.references(). -
<Ctrl-k>: Displays signature information about the symbol under the cursor in a floating window. See :help vim.lsp.buf.signature_help(). If a mapping already exists for this key this function is not bound. -
<F2>: Renames all references to the symbol under the cursor. See :help vim.lsp.buf.rename(). -
<F4>: Selects a code action available at the current cursor position. See :help vim.lsp.buf.code_action(). -
gl: Show diagnostics in a floating window. See :help vim.diagnostic.open_float(). -
[d: Move to the previous diagnostic in the current buffer. See :help vim.diagnostic.goto_prev(). -
]d: Move to the next diagnostic. See :help vim.diagnostic.goto_next().
<leader> +
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ff: find_files -
fg: live_grep -
fb: buffers -
fh: help_tags