# http://fishshell.com
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾

# Detection
# ‾‾‾‾‾‾‾‾‾

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

hook global BufCreate .*[.](fish) %{
    set buffer filetype fish
}

# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾

addhl -group / regions -default code fish \
    double_string '"' (?<!\\)(\\\\)*"  '' \
    single_string "'" "'"              '' \
    comment       '#' '$'              ''

addhl -group /fish/double_string fill string
addhl -group /fish/double_string regex (\$\w+)|(\{\$\w+\}) 0:identifier
addhl -group /fish/single_string fill string
addhl -group /fish/comment       fill comment

addhl -group /fish/code regex (\$\w+)|(\{\$\w+\}) 0:identifier

# Command names are collected using `builtin --names` and 'eval' from `functions --names`
addhl -group /fish/code regex \b(and|begin|bg|bind|block|break|breakpoint|builtin|case|cd|command|commandline|complete|contains|continue|count|echo|else|emit|end|eval|exec|exit|fg|for|function|functions|history|if|jobs|not|or|printf|pwd|random|read|return|set|set_color|source|status|switch|test|ulimit|while)\b 0:keyword

# Commands
# ‾‾‾‾‾‾‾‾

def -hidden _fish_filter_around_selections %{
    eval -no-hooks -draft -itersel %{
        # remove trailing white spaces
        try %{ exec -draft <a-x>s\h+$<ret>d }
    }
}

def -hidden _fish_indent_on_char %{
    eval -no-hooks -draft -itersel %{
        # deindent on (else|end) command insertion
        try %{ exec -draft <space><a-i>w<a-k>(else|end)<ret><a-lt> }
    }
}

def -hidden _fish_indent_on_new_line %{
    eval -no-hooks -draft -itersel %{
        # preserve previous line indent
        try %{ exec -draft <space>K<a-&> }
        # filter previous line
        try %{ exec -draft k:_fish_filter_around_selections<ret> }
        # copy '#' comment prefix and following white spaces
        try %{ exec -draft kxs^\h*\K#\h*<ret>yjp }
        # indent after (case|else) commands
        try %{ exec -draft <space>kx<a-k>(case|else)<ret>j<a-gt> }
        # indent after (begin|for|function|if|switch|while) commands and add 'end' command
        try %{ exec -draft <space>kx<a-k>(begin|for|function|(?<!(else)\h+)if|switch|while)<ret>xypjaend<esc>k<a-gt> }
    }
}

# Initialization
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾

hook global WinSetOption filetype=fish %{
    addhl ref fish

    hook window InsertEnd  .* -group fish-hooks  _fish_filter_around_selections
    hook window InsertChar .* -group fish-indent _fish_indent_on_char
    hook window InsertChar \n -group fish-indent _fish_indent_on_new_line
}

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