-- Example hooks.lua file, put in ~/.elinks/ as hooks.lua.

-- TODO: Bookmarks stuff should be completely moved to bm.lua. --pasky

-- Take care about @SOMETHING@, we're processed with autoconf!

----------------------------------------------------------------------
--  Compatibility routines for Lua 4 code.
--  Taken from Lua's compat.lua.
----------------------------------------------------------------------

_INPUT = io.stdin
_OUTPUT = io.stdout

function writeto (name)
  if name == nil then
    local f, err, cod = io.close(_OUTPUT)
    _OUTPUT = io.stdout
    return f, err, cod
  else
    local f, err, cod = io.open(name, "w")
    _OUTPUT = f or _OUTPUT
    return f, err, cod
  end
end

function write (...)
  local f = _OUTPUT
  if type(arg[1]) == 'userdata' then
    f = table.remove(arg, 1)
  end
  return f:write(unpack(arg))
end

function read (...)
  local f = _INPUT
  if type(arg[1]) == 'userdata' then
    f = table.remove(arg, 1)
  end
  return f:read(unpack(arg))
end

function do_ (f, err)
  if not f then _ALERT(err); return end
  local a,b = pcall(f)
  if not a then _ALERT(b); return nil
  else return b or true
  end
end

function dostring(s) return do_(loadstring(s)) end
function dofile(s) return do_(loadfile(s)) end

----------------------------------------------------------------------
--  Load configuration
----------------------------------------------------------------------

function file_exists(filename)
    local f = io.open(filename, "r")
    if f then
	io.close(f)
	return 1
    end
    return nil
end

function dofile_if_fileexists(filename)
    if file_exists(filename) then dofile(filename) end
end

dofile_if_fileexists ("@sysconfdir@/config.lua")
home_dir = (os.getenv ("HOME") or "/home/"..os.getenv("USER")) or "."
hooks_file = elinks_home.."/hooks.lua" -- for reload()
dofile_if_fileexists (elinks_home.."/config.lua")

----------------------------------------------------------------------
-- hooks
----------------------------------------------------------------------

pre_format_html_hooks = {n=0}
function pre_format_html_hook (url, html)
    local changed = nil

    for i,fn in ipairs(pre_format_html_hooks)
    do
        local new,stop = fn(url,html)

        if new then html=new changed=1 end
    end

    return changed and html
end

goto_url_hooks = {n=0}
function goto_url_hook (url, current_url)
    for i,fn in ipairs(goto_url_hooks)
    do
        local new,stop = fn(url, current_url)

        url = new
    end

    return url
end

follow_url_hooks = {n=0}
function follow_url_hook (url)
    for i,fn in ipairs(follow_url_hooks)
    do
        local new,stop = fn(url)

        url = new

    end

    return url
end

quit_hooks = {n=0}
function quit_hook (url, html)
    for i, fn in ipairs(quit_hooks)
    do
        fn()
    end
end

----------------------------------------------------------------------
--  case-insensitive string.gsub
----------------------------------------------------------------------

-- Please note that this is not completely correct yet.
-- It will not handle pattern classes like %a properly.
-- FIXME: Handle pattern classes.

function gisub (s, pat, repl, n)
    pat = string.gsub (pat, '(%a)',
	        function (v) return '['..string.upper(v)..string.lower(v)..']' end)
    if n then
	return string.gsub (s, pat, repl, n)
    else
	return string.gsub (s, pat, repl)
    end
end


----------------------------------------------------------------------
--  goto_url_hook
----------------------------------------------------------------------

function match (prefix, url)
    return string.sub (url, 1, string.len (prefix)) == prefix
end

function hx (c)
    return string.char((c >= 10 and (c - 10) + string.byte ('A')) or c + string.byte ('0'))
end

function char2hex (c)
    return '%'..hx (string.byte (c) / 16)..hx (math.mod(string.byte (c), 16))
end

function escape (str)
    return string.gsub (str, "(%W)", char2hex)
end

-- You can write smt like "gg" to goto URL dialog and it'll go to google.com.

-- Note that this is obsoleted by the URI rewrite plugin.

dumbprefixes = {
    arc = "http://web.archive.org/web/*/%c",
    b = "http://babelfish.altavista.com/babelfish/tr",
    bz = "http://bugzilla.elinks.cz",
    bug = "http://bugzilla.elinks.cz",
    d = "http://www.dict.org",
    g  = "http://www.google.com/",
    gg = "http://www.google.com/",
    go = "http://www.google.com/",
    fm = "http://www.freshmeat.net/",
    sf = "http://www.sourceforge.net/",
    dbug = "http://bugs.debian.org/",
    dpkg = "http://packages.debian.org/",
    -- Hm, is this Debian-centric? -- Miciah
    lua = "file:///usr/share/doc/lua40-doc/manual/idx.html",
    pycur = "http://www.python.org/doc/current/",
    pydev = "http://www.python.org/dev/doc/devel/",
    pyhelp = "http://starship.python.net/crew/theller/pyhelp.cgi",
    pyvault = "http://www.vex.net/parnassus/",
    e2 = "http://www.everything2.org/",
    sd = "http://www.slashdot.org/",
    vhtml = "http://validator.w3.org/check?uri=%c",
    vcss = "http://jigsaw.w3.org/css-validator/validator?uri=%c",
}

function debian_package (url, t)
	url = string.gsub(url, '(%w+):(%w+)', function (key, val) t[key] = val end)

	return 'http://packages.debian.org/cgi-bin/search_contents.pl?word='
	..escape(string.gsub(url, '%s*([^%s]+)%s*', '%1'))
	..'&searchmode='..(t.searchmode or 'searchfilesanddirs')
	..'&case='..(t.case or 'insensitive')
	..'&version='..(t.version or pipe_read('test -r /etc/debian_version && cut -d/ -f1 /etc/debian_version | tr -d \\\\n || echo stable') or 'stable')
	..'&arch='..(t.arch or pipe_read('test -x /usr/bin/dpkg-architecture && dpkg-architecture -qDEB_HOST_ARCH | tr -d \\\\n || echo i386'))
end

function debian_contents (url)
	return debian_package (url, { searchmode = "filelist" })
end

function debian_file (url)
	return debian_package (url, { searchmode = "searchfilesanddirs" })
end

function cvsweb (base, project, url)
	local t = {n=0}
	local file, old, new
	local replacements

	-- allow <file>:<revision>[-><revision>]
	url,replacements = string.gsub(url, "^(.*):(.*)->(.*)$", "%1 %2 %3")
	if replacements == 0 then url = string.gsub(url, "^(.*):(.*)$", "%1 %2") end

	-- split into words
	string.gsub(url, "([^%s]+)", function (w) table.insert(t, w) end)
	file, old, new = t[1], t[2], t[3]

	if t[4] then error('this smartprefix takes only one to three arguments') return nil end
	if not file then error('no file given') return nil end

	if     new then return base..project.."/"..file..".diff?r1="..old.."&r2="..new.."&f=u"
	elseif old then return base.."~checkout~/"..project.."/"..file..(old ~= "latest" and "?rev="..old or "")
	else            return base..project.."/"..file
	end
end

function gmane (url)
	local group, words

	_,_,group,words = string.find(url, "([^%s]+)%s%s*(.*)$")

	if not words then return nil end

	return "http://search.gmane.org/search.php?query="..words.."&group="..group
end

-- You can write "gg:foo" or "gg foo" to goto URL dialog and it'll ask google
-- for it automagically.

-- Note that this is _mostly_ obsoleted by the URI rewrite plugin. (It can't do the
-- metas, though.)

function bugzilla (base_url, arguments)
	if not arguments or arguments == '' then return base_url end

	if string.find(arguments, '^[%d]+$') then
		return base_url..'show_bug.cgi?id='..arguments
	end

	return base_url..'buglist.cgi?short_desc_type=allwordssubstr'
               ..'&short_desc='..escape(arguments)
end

smartprefixes = {
    arc = "http://web.archive.org/web/*/%s",
    bug = function (url) return bugzilla('http://bugzilla.elinks.cz/', url) end,
    cambridge = "http://dictionary.cambridge.org/results.asp?searchword=%s",
    cliki = "http://www.cliki.net/admin/search?words=%s",
    -- If you want to add a smartprefix for another project's CVSweb,
    -- just create a lambda like this. Aren't high-level languages fun?
    cvs = function (x) return cvsweb ("http://cvsweb.elinks.cz/cvsweb.cgi/", "elinks", x) end,
    d = "http://www.dict.org/bin/Dict?Query=%s&Form=Dict1&Strategy=*&Database=*&submit=Submit+query",
    debcontents = debian_contents,
    debfile = debian_file,
    dmoz = "http://search.dmoz.org/cgi-bin/search?search=%s",
    foldoc = "http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?%s",
    g  = "http://www.google.com/search?q=%s&btnG=Google+Search",
    gd = "http://www.google.com/search?q=%s&cat=gwd/Top",
    gg = "http://www.google.com/search?q=%s&btnG=Google+Search",
    -- Whose idea was it to use 'gg' for websearches? -- Miciah
    --gg = "http://groups.google.com/groups?q=%s",
    gi = "http://images.google.com/images?q=%s",
    gmane = gmane,
    gn = "http://news.google.com/news?q=%s",
    go = "http://www.google.com/search?q=%s&btnG=Google+Search",
    gwho = "http://www.googlism.com/?ism=%s&name=1",
    gwhat = "http://www.googlism.com/?ism=%s&name=2",
    gwhere = "http://www.googlism.com/?ism=%s&name=3",
    gwhen = "http://www.googlism.com/?ism=%s&name=4",
    fm = "http://www.freshmeat.net/search/?q=%s",
    savannah = "http://savannah.nongnu.org/search/?words=%s&type_of_search=soft&exact=1",
    sf = "http://sourceforge.net/search/?q=%s",
    sfp = "http://sourceforge.net/projects/%s",
    sd = "http://www.slashdot.org/search.pl?query=%s",
    sdc = "http://www.slashdot.org/search.pl?query=%s&op=comments",
    sdu = "http://www.slashdot.org/search.pl?query=%s&op=users",
    sdp = "http://www.slashdot.org/search.pl?query=%s&op=polls",
    sdj = "http://www.slashdot.org/search.pl?query=%s&op=journals",
    dbug = "http://bugs.debian.org/%s",
    dpkg = "http://packages.debian.org/%s",
    emacs = "http://www.emacswiki.org/cgi-bin/wiki.pl?search=%s",
    lyrics = "http://music.lycos.com/lyrics/results.asp?QT=L&QW=%s",
    lxr = "http://lxr.linux.no/ident?i=%s",
    leo = "http://dict.leo.org/?search=%s",
    onelook = "http://onelook.com/?w=%s&ls=a",
    py = "http://starship.python.net/crew/theller/pyhelp.cgi?keyword=%s&version=current",
    pydev = "http://starship.python.net/crew/theller/pyhelp.cgi?keyword=%s&version=devel",
    pyvault = "http://py.vaults.ca/apyllo.py?find=%s",
    e2 = "http://www.everything2.org/?node=%s",
    encz = "http://www.slovnik.cz/bin/ecd?ecd_il=1&ecd_vcb=%s&ecd_trn=translate&ecd_trn_dir=0&ecd_lines=15&ecd_hptxt=0",
    czen = "http://www.slovnik.cz/bin/ecd?ecd_il=1&ecd_vcb=%s&ecd_trn=translate&ecd_trn_dir=1&ecd_lines=15&ecd_hptxt=0",
    dict = "http://dictionary.reference.com/search?q=%s",
    thes = "http://thesaurus.reference.com/search?q=%s",
    a = "http://acronymfinder.com/af-query.asp?String=exact&Acronym=%s",
    imdb = "http://imdb.com/Find?%s",
    mw = "http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=%s",
    mwt = "http://www.m-w.com/cgi-bin/thesaurus?book=Thesaurus&va=%s",
    whatis = "http://uptime.netcraft.com/up/graph/?host=%s",
    wiki = "http://www.wikipedia.org/w/wiki.phtml?search=%s",
    wn = "http://www.cogsci.princeton.edu/cgi-bin/webwn1.7.1?stage=1&word=%s",
    -- rfc by number
    rfc = "http://www.rfc-editor.org/rfc/rfc%s.txt",
    -- rfc search
    rfcs = "http://www.rfc-editor.org/cgi-bin/rfcsearch.pl?searchwords=%s&format=http&abstract=abson&keywords=keyon&num=25",
    cr   = "http://www.rfc-editor.org/cgi-bin/rfcsearch.pl?searchwords=%s&format=http&abstract=abson&keywords=keyon&num=25",
    -- Internet Draft search
    rfcid = "http://www.rfc-editor.org/cgi-bin/idsearch.pl?searchwords=%s&format=http&abstract=abson&keywords=keyon&num=25",
    urbandict = "http://www.urbandictionary.com/define.php?term=%s",
    id    = "http://www.rfc-editor.org/cgi-bin/idsearch.pl?searchwords=%s&format=http&abstract=abson&keywords=keyon&num=25",
    draft = "http://www.rfc-editor.org/cgi-bin/idsearch.pl?searchwords=%s&format=http&abstract=abson&keywords=keyon&num=25",
}

-- Expand ~ to home directories.
function expand_tilde (url, current_url)
    if not match ("~", url) then return url,nil end

    if string.sub(url, 2, 2) == "/" or string.len(url) == 1 then    -- ~/foo
	return home_dir..string.sub(url, 2),true
    else                                -- ~foo/bar
	return "/home/"..string.sub(url, 2),true
    end
end
table.insert(goto_url_hooks, expand_tilde)


-- Don't take localhost as directory name
function expand_localhost (url)
    if not match("localhost", url) then return url,nil end

    return "http://"..url,nil
end
table.insert(goto_url_hooks, expand_localhost)


function complete_uri_prefix (url, current_url)
    if dumbprefixes[url] then
	return string.gsub(dumbprefixes[url], "%%c", current_url or ""),true
    end

    if string.find(url,'%s') or string.find(url, ':') then
        local _,_,nick,val = string.find(url, "^([^%s:]+)[:%s]%s*(.-)%s*$")
        if nick and smartprefixes[nick] then
            if type(smartprefixes[nick]) == 'function' then
                return smartprefixes[nick](val),true
            elseif type(smartprefixes[nick]) == 'string' then
                return string.format(smartprefixes[nick], escape(val)),true
            else
                error('smartprefix "'..nick..'" has unsupported type "'
                      ..type(smartprefixes[nick])..'".')
                return url,nil
            end
        end
    end

    -- Unmatched.
    return url,nil
end
table.insert(goto_url_hooks, complete_uri_prefix)


----------------------------------------------------------------------
--  pre_format_html_hook
----------------------------------------------------------------------

-- Plain string.find (no metacharacters).
function sstrfind (s, pattern)
    return string.find (s, pattern, 1, 1)
end

-- Mangle ALT="" in IMG tags.
function mangle_blank_alt (url, html)
    local n

    if not mangle_blank_alt then return nil,nil end

    html, n = gisub (html, '(<img[^>]-) alt=""', '%1 alt="&nbsp;"')

    return ((n > 0) and html), nil
end
table.insert(pre_format_html_hooks, mangle_blank_alt)


-- Fix unclosed INPUT tags.
function mangle_unclosed_input_tags (url, html)
    local n

    html, n = gisub (html, '(<input[^>]-[^=]")<', '%1><')

    return ((n > 0) and html), nil
end
table.insert(pre_format_html_hooks, mangle_unclosed_input_tags)


-- Fix unclosed A tags.
function mangle_unclosed_a_tags (url, html)
    local n

    html, n = gisub (html, '(<a[^>]-[^=]")<', '%1><')

    return ((n > 0) and html), nil
end
table.insert(pre_format_html_hooks, mangle_unclosed_a_tags)


function mangle_linuxtoday (url, html)
    if not sstrfind (url, "linuxtoday.com") then return nil,nil end

    if sstrfind (url, "news_story") then
	html = string.gsub (html, '<TABLE CELLSPACING="0".-</TABLE>', '', 1)
	html = string.gsub (html, '<TR BGCOLOR="#FFF.-</TR></TABLE>', '', 1)
    else
	html = string.gsub (html, 'WIDTH="120">\n<TR.+</TABLE></TD>', '>', 1)
    end
    html = string.gsub (html, '<A HREF="http://www.internet.com.-</A>', '')
    html = string.gsub (html, "<IFRAME.-</IFRAME>", "")
    -- emphasis in text is lost
    html = string.gsub (html, 'text="#002244"', 'text="#001133"', 1)

    return html,true
end
table.insert(pre_format_html_hooks, mangle_linuxtoday)


function mangle_dictionary_dot_com (url, html)
    local t = { t = "" }
    local n

    if not sstrfind (url, "dictionary.com/cgi-bin/dict.pl") then return nil,nil end

    _,n = string.gsub (html, "resultItemStart %-%-%>(.-)%<%!%-%- resultItemEnd",
		       function (x) t.t = t.t.."<tr><td>"..x.."</td></tr>" end)
    if n == 0 then
	-- we've already mangled this page before
	return nil,true
    end

    html = "<html><head><title>Dictionary.com lookup</title></head>"..
	   "<body><table border=0 cellpadding=5>"..t.t.."</table>"..
	   "</body></html>"

    return html,true
end
table.insert(pre_format_html_hooks, mangle_dictionary_dot_com)


function mangle_allmusic_dot_com (url, html)
    if not sstrfind (url, "allmusic.com") then return nil,nil end

    html = string.gsub(html, "javascript:z%('(.-)'%)", "/cg/amg.dll?p=amg&sql=%1")

    return html,true
end
table.insert(pre_format_html_hooks, mangle_allmusic_dot_com)


-- Handle gzip'd files within reasonable size.
-- Note that this is not needed anymore since we have a support for this
-- in core ELinks. I still keep it here for a reference (as an example),
-- though. If you will add something similiar using pipe_read(), feel free
-- to remove this. --pasky
function decompress_html (url, html)
    local tmp

    if not string.find (url, "%.gz$") or string.len (html) >= 65536 then
	return nil,nil
    end

    tmp = tmpname ()
    writeto (tmp) write (html) writeto ()
    html = pipe_read ("(gzip -dc "..tmp.." || cat "..tmp..") 2>/dev/null")
    os.remove (tmp)

    return html,nil
end
--table.insert(pre_format_html_hooks, decompress_html)

----------------------------------------------------------------------
--  Miscellaneous functions, accessed with the Lua Console.
----------------------------------------------------------------------

-- Reload this file (hooks.lua) from within Links.
function reload ()
    dofile (hooks_file)
end

-- Helper function.
function catto (output)
    local doc = current_document_formatted (79)
    if doc then writeto (output) write (doc) writeto () end
end

-- Email the current document, using Mutt (http://www.mutt.org).
-- This only works when called from lua_console_hook, below.
function mutt ()
    local tmp = tmpname ()
    writeto (tmp) write (current_document ()) writeto ()
    table.insert (tmp_files, tmp)
    return "run", "mutt -a "..tmp
end

-- Table of expressions which are recognised by our lua_console_hook.
console_hook_functions = {
    reload	= "reload ()",
    mutt	= mutt,
}

function lua_console_hook (expr)
    local x = console_hook_functions[expr]
    if type (x) == "function" then
	return x ()
    else
	return "eval", x or expr
    end
end


----------------------------------------------------------------------
--  quit_hook
----------------------------------------------------------------------

-- We need to delete the temporary files that we create.
if not tmp_files then
    tmp_files = {}
end

function delete_tmp_files ()
    if tmp_files and os.remove then
        tmp_files.n = nil
        for i,v in tmp_files do os.remove (v) end
    end
end
table.insert(quit_hooks, delete_tmp_files)


----------------------------------------------------------------------
--  Examples of keybinding
----------------------------------------------------------------------

-- Bind Ctrl-H to a "Home" page.

--    bind_key ("main", "Ctrl-H",
--	      function () return "goto_url", "http://www.google.com/" end)

-- Bind Alt-p to print.

--    bind_key ("main", "Alt-p", lpr)

-- Bind Alt-m to toggle ALT="" mangling.

    bind_key ("main", "Alt-m",
	      function () mangle_blank_alt = not mangle_blank_alt end)


-- vim: shiftwidth=4 softtabstop=4
