LinuxInstalls/nvim/README.md

Neovim Setup for Fedora

A single-script Neovim configuration built around C/C++ development (CMake + clangd + codelldb), with LSP support for Go, C#, TypeScript/JavaScript, HTML, and CSS alongside it.

Installing

chmod +x setup_neovim.sh
./setup_neovim.sh

This deletes ~/.config/nvim and ~/.local/share/nvim before writing the new config — there is no backup step. If you have an existing Neovim setup you care about, copy it elsewhere first.

The script:

1. Installs system packages via dnf (compilers, debuggers, language runtimes, LSPs) and two Nerd Fonts (JetBrainsMono, Cascadia Code) for icon glyphs.
2. Wipes and rewrites ~/.config/nvim.
3. Writes a personal ~/.clang-format fallback (see Formatting).

First launch will take a minute or two: lazy.nvim bootstraps itself and installs all plugins, then Mason installs the language servers and codelldb.

What gets installed

• Compilers/tools: gcc, g++, make, cmake, clang-tools-extra, lldb, gdb, dotnet-sdk-8.0, golang, nodejs/npm, python3-pip
• CLI tools: ripgrep, fd-find, git, curl, wget, unzip, fish (used only for Neovim's embedded terminal — see Terminal)
• Language servers: clangd, gopls, omnisharp, ts_ls, html, cssls (via Mason), plus typescript-language-server and vscode-langservers-extracted via npm
• Debug adapter: codelldb (auto-installed by Mason on first debug session)

Editor basics

• Relative + absolute line numbers, system clipboard integration (unnamedplus), persistent undo, smart-case search, always-on sign column.
• Tab width: 4, using real tab characters — not expanded to spaces.
• True color, rounded borders on floating windows (hover, LspInfo, Mason, etc. — Neovim 0.11+), styled window separators.
• OSC 52 clipboard support, so yank/paste works correctly over SSH.
• c/cpp/javascript/typescript indentation uses Neovim's own built-in per-filetype indent logic (cindent for c/cpp, the bundled JS/TS indent scripts for the rest) rather than treesitter's indent module — treesitter's indent is known to be unreliable for these specifically (inconsistent brace placement, phantom extra indent on nested blocks), more so since the nvim-treesitter branch this config uses is frozen upstream (see Known quirks). css/json are also curly-brace languages that can hit the same issue — worth disabling there too if it comes up.

General keymaps

Key	Mode	Action
<Esc>	Normal	Clear search highlight
<leader>p	Normal	Force inline paste (paste as characters at cursor, ignoring line-wise register type)
p / P	Visual	Paste over selection without clobbering the unnamed register
J / K	Visual	Move selected lines down / up
<C-s>	Normal/Visual/Insert	Save file
<C-h/j/k/l>	Normal	Move to left/lower/upper/right window
<leader>sv / <leader>sh	Normal	Split vertically / horizontally
<leader>se	Normal	Equalize split sizes
<leader>sx	Normal	Close current split

Look & feel

• Theme: tokyonight (night variant), customized to a pure black background, with custom colors for error/warn/info/hint diagnostic virtual lines.
• Dashboard: alpha-nvim start screen with quick actions — find file, recent files, live grep, new file, edit config, quit.
• Statusline: lualine, themed to match, shows mode, git branch, diagnostics, filename, encoding/filetype, progress, and cursor location.
• Indent guides: indent-blankline — colored guide per indent level, plus the current lexical scope (the block your cursor is inside) is highlighted with its own guide color. The underline that used to mark the scope's start/end line is disabled (show_start/show_end = false) — just the colored guide remains.
• Inline color previews: nvim-colorizer shows hex/rgb color values with their actual color as a background.
• Notifications: nvim-notify replaces the default notification popups with floating, styled ones.
• Prompts: dressing.nvim upgrades the rename prompt, breakpoint-condition prompt, and DAP path prompts to floating dialogs instead of plain command-line input.

Buffers & tabs (bufferline)

Each buffer tab shows its ordinal position number. Pinned buffers are always kept leftmost as a block.

Key	Action
<S-h> / <S-l>	Previous / next buffer (follows the order shown on screen, including any reordering)
<A-1> … <A-9> / <F1>–<F9>	Jump directly to the buffer at that position. <F5> and <F10> each pull double duty with the debugger (see Debugging) — they act as buffer jumps at rest, and hand themselves over to DAP for the duration of an active debug session.
<A-0> / <F10>	Jump to the last buffer.
<A-,> / <A-.>	Move current buffer left / right (blocked from crossing into the pinned block — wraps to the other end instead)
<leader>bp	Toggle pin on current buffer
<leader>bx	Close every unpinned buffer with no unsaved changes (pinned buffers and anything modified are left alone)
<leader>bd	Close current buffer

Setting an explicit <F1> mapping here also overrides Neovim's built-in <F1>-opens-help default — any explicit keymap for a key always takes precedence over Neovim's default for it.

File & text search (telescope)

Key	Action
<leader>ff	Find files
<leader>fw	Live grep
<leader>fb	List open buffers
<leader>fh	Search help tags
<leader>fr	Recent files
<leader>e	Toggle the file explorer sidebar (nvim-tree, right side)

LSP & code intelligence

Configured servers: clangd (C/C++), gopls (Go), omnisharp (C#), ts_ls (TS/JS), html, cssls. Diagnostics render as virtual lines above the offending line (not inline virtual text), with the message's leading category prefix stripped; diagnostic underlines are off.

Key	Action
gd	Go to definition. Fuzzy picker with preview if there's more than one match (e.g. overloads); jumps directly for a single match. On an #include line, opens the header file directly — falls back to Vim's built-in gf if clangd can't resolve it.
gD	Go to declaration. Same #include-awareness and fallback as gd.
gr	Find all references, in a fuzzy picker with preview.
K	Hover documentation (renders Doxygen comments if present).
<leader>lr	Rename symbol (prompts for new name, safe against double-firing).
<leader>la	Code actions.
<leader>lf	Format file (via clangd/LSP formatting — see Formatting for the style used).
<leader>li	Show LSP client info.
<leader>cd	Generate a Doxygen-style comment block (@brief/@param/@return) above the function under the cursor — see Documentation generation.

Autocompletion & snippets

nvim-cmp with LSP, snippet, buffer, and path sources.

• Ghost text: the top completion candidate previews inline after the cursor as you type — including path/directory completions (type ./ or /home/ and see what's in that directory before you finish typing it).
• <Tab> / <S-Tab>: cycle the completion menu when it's open; otherwise, jump forward/backward through snippet placeholders (e.g. clangd's function-argument placeholders after accepting a call like memcpy(...)) if you're inside one.
• <CR>: confirm the selected completion.
• <Up>/<Down>/<Left>/<Right>/<Esc>: close the completion menu, then perform the normal cursor/escape action.
• Snippet sessions auto-close once the cursor actually leaves their text (different line, or outside the placeholder's parentheses) — so Tab won't unexpectedly jump back into an old, already-finished snippet later on.

Documentation generation

neogen generates Doxygen-style comment skeletons — <leader>cd on/above a function drops in @brief/one @param per argument/@return matching that function's real signature. Fields are inserted as snippet placeholders, so <Tab>/<S-Tab> cycles through them the same way as any other snippet.

(There's no such thing as an actual "Doxygen language server" — clangd already understands Doxygen comment syntax natively for hover/signature help. This only handles generating the comment itself.)

Debugging (nvim-dap)

C/C++ (and Rust) debugging via codelldb, auto-installed by Mason on first use. UI (nvim-dap-ui) opens automatically when a session starts and closes when it ends; variable values show inline via virtual text.

Key	Action
F5 / <leader>dc	Continue / start debugging — F5 only while a session is already active; before that it's the "jump to buffer 5" shortcut, so start a session with <leader>dc or <leader>db, not F5
F10 / <leader>do	Step over — F10 only while a debug session is active; otherwise it's the "jump to last buffer" shortcut (see Buffers & tabs)
F11 / <leader>di	Step into
F12 / <leader>dO	Step out
<leader>db	Toggle breakpoint
<leader>dB	Conditional breakpoint
<leader>dr	Open the debug REPL
<leader>dl	Re-run the last debug configuration
<leader>dt	Terminate the session
<leader>du	Toggle the debug UI
<leader>dh	Hover the variable under the cursor

Default launch configs prompt for a path to the executable, or let you attach to a running process. ~/.config/nvim/lua/dap/configurations/cmake.lua additionally defines project-specific configs for CMake-built targets (build/tests/test_dynamic_library, build/demo/example_host) — this file is a template with this repo's specific binary names/paths and will need editing for a different project.

Terminal

Key	Action
<leader>tf	Floating terminal
<leader>th	Horizontal terminal (bottom)
<leader>tv	Vertical terminal (side)

Neovim's embedded terminal launches fish instead of your login shell, purely for its built-in inline "ghost text" suggestions for paths and command history (no config needed, accept with →/End) — a terminal-side equivalent of the completion ghost text above, since a :terminal buffer is a raw PTY that nvim-cmp has no visibility into. Your actual system login shell is untouched.

Git

gitsigns shows added/changed/removed lines in the sign column against the current git state.

Formatting

~/.clang-format is written on every run (LLVM-based, BreakBeforeBraces: Attach for K&R-style braces, 4-wide real tabs via UseTab: Always/TabWidth: 4 to match the editor, 100-column limit). clang-format walks upward from the file being formatted looking for a .clang-format; since $HOME sits above every project, this acts as a personal default for any project that doesn't ship its own .clang-format — a project's own file always takes precedence.

Known quirks

• nvim-treesitter is pinned to its master branch, not the current upstream default (main). main is an incompatible rewrite that removed the nvim-treesitter.configs API this config (and most existing configs/plugins) are built on. master is kept frozen upstream specifically for this kind of backward compatibility.
• A Neovim 0.12 compatibility shim is included for master-branch treesitter: 0.12 changed query predicate/directive results to sometimes be a list of nodes instead of a single node, which master's legacy predicate handlers don't expect — this caused a "Decoration provider ... attempt to call method 'range'" error (most visible on markdown files). The shim normalizes results back to a single node before those handlers run. Purely cosmetic when unpatched (highlighting still worked) but noisy.