ccls/src/config.h

// Copyright 2017-2018 ccls Authors
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "serializer.h"

#include <string>

/*
The language client plugin needs to send initialization options in the
`initialize` request to the ccls language server.

If necessary, the command line option --init can be used to override
initialization options specified by the client. For example, in shell syntax:

  '--init={"index": {"comments": 2, "whitelist": ["."]}}'
*/
struct Config {
  // Root directory of the project. **Not available for configuration**
  std::string projectRoot;
  // If specified, this option overrides compile_commands.json and this
  // external command will be executed with an option |projectRoot|.
  // The initialization options will be provided as stdin.
  // The stdout of the command should be the JSON compilation database.
  std::string compilationDatabaseCommand;
  // Directory containing compile_commands.json.
  std::string compilationDatabaseDirectory;
  // Cache directory for indexed files, either absolute or relative to the
  // project root.
  // If empty, cache will be stored in memory.
  std::string cacheDirectory = ".ccls-cache";
  // Cache serialization format.
  //
  // "json" generates `cacheDirectory/.../xxx.json` files which can be pretty
  // printed with jq.
  //
  // "binary" uses a compact binary serialization format.
  // It is not schema-aware and you need to re-index whenever an internal struct
  // member has changed.
  SerializeFormat cacheFormat = SerializeFormat::Binary;

  struct Clang {
    // Arguments that should be excluded, e.g. ["-fopenmp", "-Wall"]
    //
    // e.g. If your project is built by GCC and has an option thag clang does not understand.
    std::vector<std::string> excludeArgs;

    // Additional arguments to pass to clang.
    std::vector<std::string> extraArgs;

    // Translate absolute paths in compile_commands.json entries, .ccls options
    // and cache files. This allows to reuse cache files built otherwhere if the
    // source paths are different.
    //
    // This is a list of colon-separated strings, e.g. ["/container:/host"]
    //
    // An entry of "clang -I /container/include /container/a.cc" will be
    // translated to "clang -I /host/include /host/a.cc". This is simple string
    // replacement, so "clang /prefix/container/a.cc" will become "clang
    // /prefix/host/a.cc".
    std::vector<std::string> pathMappings;

    // Value to use for clang -resource-dir if not specified.
    //
    // This option defaults to clang -print-resource-dir and should not be
    // specified unless you are using an esoteric configuration.
    std::string resourceDir;
  } clang;

  struct ClientCapability {
    // TextDocumentClientCapabilities.documentSymbol.hierarchicalDocumentSymbolSupport
    bool hierarchicalDocumentSymbolSupport = false;
    // TextDocumentClientCapabilities.completion.completionItem.snippetSupport
    bool snippetSupport = false;
  } client;

  struct CodeLens {
    // Enables code lens on parameter and function variables.
    bool localVariables = true;
  } codeLens;

  struct Completion {
    // 0: case-insensitive
    // 1: case-folded, i.e. insensitive if no input character is uppercase.
    // 2: case-sensitive
    int caseSensitivity = 2;

    // Some completion UI, such as Emacs' completion-at-point and company-lsp,
    // display completion item label and detail side by side.
    // This does not look right, when you see things like:
    //     "foo" "int foo()"
    //     "bar" "void bar(int i = 0)"
    // When this option is enabled, the completion item label is very detailed,
    // it shows the full signature of the candidate.
    // The detail just contains the completion item parent context.
    bool detailedLabel = true;

    // On large projects, completion can take a long time. By default if ccls
    // receives multiple completion requests while completion is still running
    // it will only service the newest request. If this is set to false then all
    // completion requests will be serviced.
    bool dropOldRequests = true;

    // Functions with default arguments, generate one more item per default
    // argument. That is, you get something like:
    //     "int foo()" "Foo"
    //     "void bar()" "Foo"
    //     "void bar(int i = 0)" "Foo"
    // Be wary, this is quickly quite verbose,
    // items can end up truncated by the UIs.
    bool duplicateOptional = true;

    // If true, filter and sort completion response. ccls filters and sorts
    // completions to try to be nicer to clients that can't handle big numbers
    // of completion candidates. This behaviour can be disabled by specifying
    // false for the option. This option is the most useful for LSP clients
    // that implement their own filtering and sorting logic.
    bool filterAndSort = true;

    // Regex patterns to match include completion candidates against. They
    // receive the absolute file path.
    //
    // For example, to hide all files in a /CACHE/ folder, use ".*/CACHE/.*"
    std::vector<std::string> includeBlacklist;

    // Maximum path length to show in completion results. Paths longer than this
    // will be elided with ".." put at the front. Set to 0 or a negative number
    // to disable eliding.
    int includeMaxPathSize = 30;

    // Whitelist that file paths will be tested against. If a file path does not
    // end in one of these values, it will not be considered for
    // auto-completion. An example value is { ".h", ".hpp" }
    //
    // This is significantly faster than using a regex.
    std::vector<std::string> includeSuffixWhitelist = {".h", ".hpp", ".hh", ".inc"};

    std::vector<std::string> includeWhitelist;
  } completion;

  struct Diagnostics {
    // Like index.{whitelist,blacklist}, don't publish diagnostics to
    // blacklisted files.
    std::vector<std::string> blacklist;

    // How often should ccls publish diagnostics in completion?
    //  -1: never
    //   0: as often as possible
    //   xxx: at most every xxx milliseconds
    int frequencyMs = 0;

    // If true, diagnostics will be reported for textDocument/didChange.
    bool onChange = true;

    // If true, diagnostics will be reported for textDocument/didOpen.
    bool onOpen = true;

    // If true, diagnostics will be reported for textDocument/didSave.
    bool onSave = true;

    bool spellChecking = true;

    std::vector<std::string> whitelist;
  } diagnostics;

  // Semantic highlighting
  struct Highlight {
    // true: LSP line/character; false: position
    bool lsRanges = false;

    // Like index.{whitelist,blacklist}, don't publish semantic highlighting to
    // blacklisted files.
    std::vector<std::string> blacklist;

    std::vector<std::string> whitelist;
  } highlight;

  struct Index {
    // If a translation unit's absolute path matches any EMCAScript regex in the
    // whitelist, or does not match any regex in the blacklist, it will be
    // indexed. To only index files in the whitelist, add ".*" to the blacklist.
    // `std::regex_search(path, regex, std::regex_constants::match_any)`
    //
    // Example: `ash/.*\.cc`
    std::vector<std::string> blacklist;

    // 0: none, 1: Doxygen, 2: all comments
    // Plugin support for clients:
    // - https://github.com/emacs-lsp/lsp-ui
    // - https://github.com/autozimu/LanguageClient-neovim/issues/224
    int comments = 2;

    // If false, the indexer will be disabled.
    bool enabled = true;

    // If not 0, a file will be indexed in each tranlation unit that includes it.
    int multiVersion = 0;

    // If multiVersion != 0, files that match blacklist but not whitelist will
    // still only be indexed for one version.
    std::vector<std::string> multiVersionBlacklist;
    std::vector<std::string> multiVersionWhitelist;

    // Allow indexing on textDocument/didChange.
    // May be too slow for big projects, so it is off by default.
    bool onChange = false;

    // Whether to reparse a file if write times of its dependencies have
    // changed. The file will always be reparsed if its own write time changes.
    // 0: no, 1: only after initial load of project, 2: yes
    int reparseForDependency = 2;

    // Number of indexer threads. If 0, 80% of cores are used.
    int threads = 0;

    std::vector<std::string> whitelist;
  } index;

  // Disable semantic highlighting for files larger than the size.
  int64_t largeFileSize = 2 * 1024 * 1024;

  struct WorkspaceSymbol {
    int caseSensitivity = 1;
    // Maximum workspace search results.
    int maxNum = 1000;
    // If true, workspace search results will be dynamically rescored/reordered
    // as the search progresses. Some clients do their own ordering and assume
    // that the results stay sorted in the same order as the search progresses.
    bool sort = true;
  } workspaceSymbol;

  struct Xref {
    // If true, |Location[]| response will include lexical container.
    bool container = false;
    // Maximum number of definition/reference/... results.
    int maxNum = 2000;
  } xref;
};
MAKE_REFLECT_STRUCT(Config::Clang, excludeArgs, extraArgs, pathMappings,
                    resourceDir);
MAKE_REFLECT_STRUCT(Config::ClientCapability, hierarchicalDocumentSymbolSupport,
                    snippetSupport);
MAKE_REFLECT_STRUCT(Config::CodeLens, localVariables);
MAKE_REFLECT_STRUCT(Config::Completion, caseSensitivity, detailedLabel,
                    dropOldRequests, duplicateOptional, filterAndSort,
                    includeBlacklist, includeMaxPathSize,
                    includeSuffixWhitelist, includeWhitelist);
MAKE_REFLECT_STRUCT(Config::Diagnostics, blacklist, frequencyMs, onChange,
                    onOpen, onSave, spellChecking, whitelist)
MAKE_REFLECT_STRUCT(Config::Highlight, lsRanges, blacklist, whitelist)
MAKE_REFLECT_STRUCT(Config::Index, blacklist, comments, enabled, multiVersion,
                    multiVersionBlacklist, multiVersionWhitelist, onChange,
                    reparseForDependency, threads, whitelist);
MAKE_REFLECT_STRUCT(Config::WorkspaceSymbol, caseSensitivity, maxNum, sort);
MAKE_REFLECT_STRUCT(Config::Xref, container, maxNum);
MAKE_REFLECT_STRUCT(Config, compilationDatabaseCommand,
                    compilationDatabaseDirectory, cacheDirectory, cacheFormat,

                    clang, client, codeLens, completion, diagnostics, highlight,
                    index, largeFileSize, workspaceSymbol, xref);

extern Config *g_config;

namespace ccls {
void DoPathMapping(std::string &arg);
}