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Language Server Protocol

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Language Server Protocol

What

The Language Server Protocol (LSP) defines the protocol used between an editor or IDE and a language server that provides language features like auto complete, go to definition, find all references etc.

The idea behind the Language Server Protocol (LSP) is to standardize the protocol for how such servers and development tools communicate. This way, a single Language Server can be re-used in multiple development tools, which in turn can support multiple languages with minimal effort.

How

Microsoft currently maintains a parallel list of language server implementations in the core LSP repository.

Application

use ccls

Installation

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brew install ccls rapidjson
brew info ccls

Confiuguration

ccls for vim, use vim-plug vim plugin manager.

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function! BuildTABNine(info)
  " info is a dictionary with 3 fields
  " - name:   name of the plugin
  " - status: 'installed', 'updated', or 'unchanged'
  " - force:  set on PlugInstall! or PlugUpdate!
  if a:info.status == 'installed' || a:info.force
    !./install.py
  endif
endfunction
Plug 'zxqfl/tabnine-vim', { 'do': function('BuildTABNine') }

use command :PlugInstall Install tabnine-vim

modify TabNine.toml

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command = "ccls"
args = ["--init={\"cacheDirectory\":\"${project_root}/.ccls\"}"]
synchronous_triggers = ["."]
synchronous_timeout_ms = 200
num_server_instances = 2
always_prefer = false

Bear

Install Bear

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git clone https://github.com/rizsotto/Bear.git
mkdir build32 build64
# 32
cd build32
cmake -DCMAKE_C_COMPILER_ARG1="-m32" ../Bear
make install

# 64
cd build64
cmake -DCMAKE_C_COMPILER_ARG1="-m64" ../Bear
make install

make sure libear.so in LD_LIBRARY_PATH

ERROR: ld.so: object ‘/lib/x86_64-linux-gnu/libear.so’ from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.

libear.so copy 32-bit library to /usr/lib/i386-linux-gnu/ or /usr/lib32 then copy 64-bit library to /usr/lib/x86_64-linux-gnu/.[^6]
Execute bear this way and get Compilation Database json:

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bear -l libear.so make_cmd

Reference