#!/bin/fish

set -q XDG_CONFIG_HOME; or set XDG_CONFIG_HOME ~/.config
set -q BOOKMARK_PATH; or set BOOKMARK_PATH $XDG_CONFIG_HOME/bookmarks.md
if set -q BOOKMARK_SEARCHER
    set BOOKMARK_SEARCHER (string split ' ' $BOOKMARK_SEARCHER)
else
    set BOOKMARK_SEARCHER fzf --layout reverse
end

function _help
    echo "Organize your bookmark with markdown"
    echo
    echo "Usage bm [command ...args]"
    echo
    echo "commands:"
    echo '  list [query]'
    echo '  open <query>'
    echo
    echo 'examples:'
    echo '  bm list "# daily" "# emails"            list all links under daily/emails folder'
    echo '  bm list "reddit" "github"               list all links contains specified keywords'
    echo '  bm open "# daily" "# emails"            open all links under daily/emails folder'
    echo '  bm open "reddit" "github"               open all links contains specified keywords'
    echo '  bm                                      search with $BOOKMARK_SEARCHER and then open selected'
end

function list
    set -e categories
    set -e names
    for arg in $argv
        if string match -q '#*' $arg
            set --append categories $arg
        else
            set --append names $arg
        end
    end
    _filter_category $categories < $BOOKMARK_PATH | _filter_name $names
end

function open
    if not count $argv &>/dev/null
        _search
    else
        list $argv | _open_urls
    end
end

function _filter_category
    if not count $argv >/dev/null
        cat -
        return
    end
    set categories $argv
    set -e output_indent
    while read LINE
        if set heading (string match -r '^(#+) (.*)$' $LINE)
            set heading_indent (string length $heading[2])
            if test -z "$output_indent"
                contains $LINE $categories && set output_indent $heading_indent
            else
                test "$heading_indent" -le "$output_indent" && set -e output_indent
            end
        end
        if test -n "$output_indent"
            echo $LINE
        end
    end
end

function _filter_name
    if not count $argv >/dev/null
        cat -
        return
    end
    set NAMES_PATTERN (string join '|' $argv)
    while read LINE
        if not string match -q -r $NAMES_PATTERN $LINE
            continue
        end
        echo $LINE
    end
end

function _open_urls
    set -q BROWSER; or set BROWSER xdg-open
    set LINK_PATTERN  '\[(.*?)\]\((.*?)\)'
    while read LINE
        if set link (string match -r $LINK_PATTERN $LINE)
             $BROWSER $link[3] &>/dev/null &
             disown
             sleep 0.1
        end
    end
end

function _search
    set query (sed -r '/^\s*$/d' $BOOKMARK_PATH | $BOOKMARK_SEARCHER)
    test -z "$query" && return
    if string match '#*' $query
        open $query
    else
        echo $query | _open_urls
    end
end

switch $argv[1]
    case open list help
        $argv[1..-1]
    case '*'
        _search
end