kakoune/src/rc/cpp.kak

hook global BufCreate .*\.(c|cc|cpp|cxx|C|h|hh|hpp|hxx|H) %{
    set buffer filetype cpp
}

hook global BufSetOption mimetype=text/x-c(\+\+)? %{
    set buffer filetype cpp
}

def -hidden _cpp_indent_on_new_line %@
    eval -draft -itersel %_
        # preserve previous line indent
        try %{ exec -draft k<a-x>s^\h+<ret>yj<a-h>P }
        # indent after lines ending with { or (
        try %[ exec -draft k<a-x><a-k>[{(]\h*$<ret>j<a-gt> ]
        # cleanup trailing white space son previous line
        try %{ exec -draft k<a-x>s\h+$<ret>d }
        # align to opening paren of previous line
        try %{ exec -draft [(<a-k>\`\([^\n]+\n[^\n]*\n?\'<ret>s\`\(\h*.|.\'<ret>& }
        # copy // comments prefix
        try %{ exec -draft <c-s>k<a-x>s^\h*\K(/{2,})<ret>y<c-o>P }
        # indent after visibility specifier
        try %[ exec -draft k<a-x><a-k>^\h*(public|private|protected):\h*$<ret>j<a-gt> ]
        # indent after if|else|while|for
        try %[ exec -draft <a-F>)MB<a-k>\`(if|else|while|for)\h*\(.*\)\n\h*\n\'<ret><a-space><space><a-gt> ]
    _
@

def -hidden _cpp_indent_on_closing_curly_brace %[
    # deindent on insert } alone on a line
    try %[ exec -draft <a-h><a-k>^\h+\}$<ret>< ]
    # add ; after } if class or struct definition
    try %[ exec -draft "hm<space><a-?>(class|struct)<ret><a-k>\`(class|struct)[^{}\n]+(\n)?\s*\{\'<ret><a-space>ma;<esc>" ]
]

hook global WinSetOption filetype=cpp %~
    addhl group cpp-highlight
    addhl -group cpp-highlight regex "\<(this|true|false|NULL|nullptr|)\>|\<-?\d+[fdiu]?|'((\\.)?|[^'\\])'" 0:value
    addhl -group cpp-highlight regex "\<(void|int|char|unsigned|float|bool|size_t)\>" 0:type
    addhl -group cpp-highlight regex "\<(while|for|if|else|do|switch|case|default|goto|break|continue|return|using|try|catch|throw|new|delete|and|or|not|operator|explicit)\>" 0:keyword
    addhl -group cpp-highlight regex "\<(const|mutable|auto|namespace|inline|static|volatile|class|struct|enum|union|public|protected|private|template|typedef|virtual|friend|extern|typename|override|final)\>" 0:attribute
    addhl -group cpp-highlight regex "^\h*?#.*?(?<!\\)$" 0:macro
    addhl -group cpp-highlight regex "(?<!')\".*?(?<!\\)(\\\\)*\"" 0:string
    addhl -group cpp-highlight regex "(//[^\n]*\n)|(/\*.*?(\*/|\'))" 0:comment

    # cleanup trailing whitespaces when exiting insert mode
    hook window InsertEnd .* -id cpp-hooks %{ try %{ exec -draft <a-x>s\h+$<ret>d } }

    hook window InsertChar \n -id cpp-indent _cpp_indent_on_new_line
    hook window InsertChar \} -id cpp-indent _cpp_indent_on_closing_curly_brace
~

hook global WinSetOption filetype=(?!cpp).* %{
    rmhl cpp-highlight
    rmhooks window cpp-indent
    rmhooks window cpp-hooks
}

def -hidden _cpp_insert_include_guards %{
    exec ggi<c-r>%<ret><esc>ggxs\.<ret>c_<esc><space>A_INCLUDED<esc>ggxyppI#ifndef<space><esc>jI#define<space><esc>jI#endif<space>//<space><esc>O<esc>
}

hook global BufNew .*\.(h|hh|hpp|hxx|H) _cpp_insert_include_guards

decl str-list alt_dirs ".;.."

def alt %{ %sh{
    shopt -s extglob
    alt_dirs=${kak_opt_alt_dirs//;/ }
    file=$(basename ${kak_bufname})
    dir=$(dirname ${kak_bufname})

    case ${file} in
         *.c|*.cc|*.cpp|*.cxx|*.C)
             for alt_dir in ${alt_dirs}; do
                 altname=$(ls -1 "${dir}/${alt_dir}/${file%.*}".@(h|hh|hpp|hxx|H) 2> /dev/null | head -n 1)
                 [[ -e ${altname} ]] && break
             done
         ;;
         *.h|*.hh|*.hpp|*.hxx|*.H)
             for alt_dir in ${alt_dirs}; do
                 altname=$(ls -1 "${dir}/${alt_dir}/${file%.*}".@(c|cc|cpp|cxx|C) 2> /dev/null | head -n 1)
                 [[ -e ${altname} ]] && break
             done
         ;;
    esac
    if [[ -e ${altname} ]]; then
       echo edit "'${altname}'"
    else
       echo echo "'alternative file not found'"
    fi
}}