kakoune/rc/c-family.kak

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

hook global BufCreate .*\.c$ %{
    set buffer filetype c
    set buffer mimetype ''
}

hook global BufCreate .*\.h$ %{
    try %{
        exec %{%s\b::\b|\btemplate\h*<lt>|\bclass\h+\w+|\b(typename|namespace)\b|\b(public|private|protected)\h*:<ret>}
        set buffer filetype cpp
    } catch %{
        set buffer filetype c
    }
    set buffer mimetype ''
}

hook global BufSetOption mimetype=text/x-c %{
    set buffer filetype c
}

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

hook global BufCreate .*\.m %{
    set buffer filetype objc
    set buffer mimetype ''
}

hook global BufSetOption mimetype=text/x-objc %{
    set buffer filetype objc
}

def -hidden _c-family-indent-on-new-line %~
    eval -draft -itersel %=
        # preserve previous line indent
        try %{ exec -draft \;K<a-&> }
        # 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 \`\(\h*.|.\' <ret> '<a-;>' & }
        # align to previous statement start when previous line closed a parenthesis
        # try %{ exec -draft <a-?>\)M<a-k>\`\(.*\)[^\n()]*\n\h*\n?\'<ret>s\`|.\'<ret>1<a-&> }
        # copy // comments prefix
        try %{ exec -draft \;<c-s>k<a-x> s ^\h*\K/{2,} <ret> y<c-o><c-o>P<esc> }
        # 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*\(.*\)\h*\n\h*\n?\' <ret> s \`|.\' <ret> 1<a-&>1<a-space><a-gt> ]
    =
~

def -hidden _c-family-indent-on-opening-curly-brace %[
    # align indent with opening paren when { is entered on a new line after the closing paren
    try %[ exec -draft -itersel h<a-F>)M <a-k> \`\(.*\)\h*\n\h*\{\' <ret> s \`|.\' <ret> 1<a-&> ]
]

def -hidden _c-family-indent-on-closing-curly-brace %[
    # align to opening curly brace when alone on a line
    try %[ exec -itersel -draft <a-h><a-k>^\h+\}$<ret>hms\`|.\'<ret>1<a-&> ]
    # add ; after } if class or struct definition
    try %[ exec -draft "hm;<a-?>(class|struct|union)<ret><a-k>\`(class|struct|union)[^{}\n]+(\n)?\s*\{\'<ret><a-;>ma;<esc>" ]
]

# Regions definition are the same between c++ and objective-c
%sh{
    for ft in c cpp objc; do
        if [ "${ft}" = "objc" ]; then
            maybe_at='@?'
        else
            maybe_at=''
        fi

        printf '%s' '
            addhl -group / regions -default code FT \
                string %{MAYBEAT(?<!QUOTE)"} %{(?<!\\)(\\\\)*"} "" \
                comment /\* \*/ "" \
                comment // $ "" \
                disabled ^\h*?#\h*if\h+(0|FALSE)\b "#\h*(else|elif|endif)" "#\h*if(def)?" \
                macro %{^\h*?\K#} %{(?<!\\)\n} ""

            addhl -group /FT/string fill string
            addhl -group /FT/comment fill comment
            addhl -group /FT/disabled fill rgb:666666
            addhl -group /FT/macro fill meta' | sed -e "s/FT/${ft}/g; s/QUOTE/'/g; s/MAYBEAT/${maybe_at}/;"
    done
}

# c specific
addhl -group /c/code regex %{\<NULL\>|\<-?(0x[0-9a-fA-F]+|\d+)[fdiu]?|'((\\.)?|[^'\\])'} 0:value
addhl -group /c/code regex "\<(void|int|char|unsigned|float|double|size_t)\>" 0:type
addhl -group /c/code regex "\<(while|for|if|else|do|switch|case|default|goto|break|continue|return|sizeof)\>" 0:keyword
addhl -group /c/code regex "\<(const|inline|static|volatile|struct|enum|union|typedef|extern)\>" 0:attribute

# c++ specific
addhl -group /cpp/code regex %{\<(this|true|false|NULL|nullptr|)\>|\<-?(0x[0-9a-fA-F]+|\d+)[fdiu]?|'((\\.)?|[^'\\])'} 0:value
addhl -group /cpp/code regex "\<(void|int|char|unsigned|float|double|bool|size_t)\>" 0:type
addhl -group /cpp/code regex "\<(while|for|if|else|do|switch|case|default|goto|break|continue|return|using|try|catch|throw|new|delete|and|and_eq|or|or_eq|not|operator|explicit|(?:reinterpret|const|static|dynamic)_cast|sizeof|alignof|alignas|decltype)\>" 0:keyword
addhl -group /cpp/code regex "\<(const|constexpr|mutable|auto|namespace|inline|static|volatile|class|struct|enum|union|public|protected|private|template|typedef|virtual|friend|extern|typename|override|final)\>" 0:attribute

# objective-c specific
addhl -group /objc/code regex %{\<(self|nil|id|super|TRUE|FALSE|YES|NO|NULL)\>|\<-?\d+[fdiu]?|'((\\.)?|[^'\\])'} 0:value
addhl -group /objc/code regex "\<(void|int|char|unsigned|float|bool|size_t|instancetype|BOOL|NSInteger|NSUInteger|CGFloat|NSString)\>" 0:type
addhl -group /objc/code regex "\<(while|for|if|else|do|switch|case|default|goto|break|continue|return)\>" 0:keyword
addhl -group /objc/code regex "\<(const|auto|inline|static|volatile|struct|enum|union|typedef|extern|__block|nonatomic|assign|copy|strong|retain|weak|readonly)\>" 0:attribute
addhl -group /objc/code regex "@(property|synthesize|interface|implementation|protocol|end|selector|autoreleasepool|try|catch|class|synchronized)\>" 0:attribute
addhl -group /objc/code regex "\<(IBAction|IBOutlet)\>" 0:attribute

hook global WinSetOption filetype=(c|cpp|objc) %[
    # cleanup trailing whitespaces when exiting insert mode
    hook window InsertEnd .* -group c-family-hooks %{ try %{ exec -draft <a-x>s^\h+$<ret>d } }

    hook window InsertChar \n -group c-family-indent _c-family-indent-on-new-line
    hook window InsertChar \{ -group c-family-indent _c-family-indent-on-opening-curly-brace
    hook window InsertChar \} -group c-family-indent _c-family-indent-on-closing-curly-brace

    alias window alt c-family-alternative-file

    set window formatcmd "astyle"
]

hook global WinSetOption filetype=(?!(c|cpp|objc)$).* %[
    rmhooks window c-family-hooks
    rmhooks window c-family-indent

    unalias window alt c-family-alternative-file
]

hook global WinSetOption filetype=c %[ addhl ref c ]
hook global WinSetOption filetype=(?!c$).* %[ rmhl c ]

hook global WinSetOption filetype=cpp %[ addhl ref cpp ]
hook global WinSetOption filetype=(?!cpp$).* %[ rmhl cpp ]

hook global WinSetOption filetype=objc %[ addhl ref objc ]
hook global WinSetOption filetype=(?!objc$).* %[ rmhl objc ]

def -hidden _c-family-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) _c-family-insert-include-guards

decl str-list alt_dirs ".;.."

def c-family-alternative-file -docstring "Jump to the alternate file (header/implementation)" %{ %sh{
    alt_dirs=$(echo ${kak_opt_alt_dirs} | sed -e 's/;/ /g')
    file=$(basename "${kak_buffile}")
    dir=$(dirname "${kak_buffile}")

    case ${file} in
        *.c|*.cc|*.cpp|*.cxx|*.C|*.inl|*.m)
            for alt_dir in ${alt_dirs}; do
                for ext in h hh hpp hxx H; do
                    altname="${dir}/${alt_dir}/${file%.*}.${ext}"
                    [ -f ${altname} ] && break
                done
                [ -f ${altname} ] && break
            done
        ;;
        *.h|*.hh|*.hpp|*.hxx|*.H)
            for alt_dir in ${alt_dirs}; do
                for ext in c cc cpp cxx C m; do
                    altname="${dir}/${alt_dir}/${file%.*}.${ext}"
                    [ -f ${altname} ] && break
                done
                [ -f ${altname} ] && break
            done
        ;;
        *)
            echo "echo -color Error 'extension not recognized'"
            exit
        ;;
    esac
    if [ -f ${altname} ]; then
       echo "edit '${altname}'"
    else
       echo "echo -color Error 'alternative file not found'"
    fi
}}