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39 lines
2.5 KiB
Markdown
39 lines
2.5 KiB
Markdown
# ccls
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[](https://telegram.me/cclsp)
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[](https://gitter.im/ccls-project/ccls)
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ccls, which originates from [cquery](https://github.com/cquery-project/cquery), is a C/C++/Objective-C language server.
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* code completion (with both signature help and snippets)
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* [definition](src/messages/text_document_definition.cc)/[references](src/messages/text_document_references.cc), and other cross references
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* [call (caller/callee) hierarchy](src/messages/ccls_call_hierarchy.cc), [inheritance (base/derived) hierarchy](src/messages/ccls_inheritance_hierarchy.cc), [member hierarchy](src/messages/ccls_member_hierarchy.cc)
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* [symbol rename](src/messages/text_document_rename.cc)
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* [document symbols](src/messages/text_document_document_symbol.cc) and approximate search of [workspace symbol](src/messages/workspace_symbol.cc)
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* [hover information](src/messages/text_document_hover.cc)
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* diagnostics
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* code actions (clang FixIts)
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* preprocessor skipped regions
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* semantic highlighting, including support for [rainbow semantic highlighting](https://medium.com/@evnbr/coding-in-color-3a6db2743a1e)
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It makes use of C++17 features, has less third-party dependencies and slimmed-down code base. Cross reference features are strenghened, (see [wiki/FAQ](../../wiki/FAQ). It currently uses libclang to index C++ code but will switch to Clang C++ API. Refactoring and formatting are non-goals as they can be provided by clang-format, clang-include-fixer and other Clang based tools.
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The comparison with cquery as noted on 2018-07-15:
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| | cquery | ccls |
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|------------ |--------------------------------|------------------------------|
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| third_party | more | fewer |
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| C++ | C++14 | C++17 |
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| clang API | libclang (C) | clang/llvm C++ |
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| Filesystem | AbsolutePath + custom routines | llvm/Support |
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| index | libclang | clangIndex, some enhancement |
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| pipeline | index merge+id remapping | simpler and more robust |
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cquery has system include path detection (through running the compiler driver) while ccls uses clangDriver.
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# >>> [Getting started](../../wiki/Getting-started) (CLICK HERE) <<<
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* [Build](../../wiki/Build)
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* [Emacs](../../wiki/Emacs)
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* [FAQ](../../wiki/FAQ)
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