[llvm-bugs] [Bug 42752] New: clangd CLI usability improvements

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42752

            Bug ID: 42752
           Summary: clangd CLI usability improvements
           Product: clang-tools-extra
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: clangd
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sammccall at google.com
                CC: llvm-bugs at lists.llvm.org

Some unintrusive changes to ClangdMain.cpp to improve usability.
Would be great to slip these into the llvm-9 release.

366811 - Log version, cwd, args, and transport on startup. NFC
366880 - Reformat use of cl::opt: use unqualified name and don't bin-pack
attributes. NFC (needed to avoid merge conflicts on next patch)
366900 - Add categories to help options, and only show clangd options.
366991 - Also accept flags from CLANGD_FLAGS variable.
366992 - Provide help text to users who run `clangd` in a terminal.

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