mirror of
https://github.com/rkd77/elinks.git
synced 2024-12-04 14:46:47 -05:00
lua-scripting: Revised examples for Lua 5.0. And other updates.
Use admonishment elements, especially WARNING for insecure temporary files. Don't say anything about enabling system functions. Linuxgames.com no longer uses <CENTER>. AppWatch.com was shut down on 2001-08-31.
This commit is contained in:
Kalle Olavi Niemitalo
Kalle Olavi Niemitalo
parent
689d80fada
commit
e27a3c3f58
@ -146,7 +146,7 @@ goto_url_hook (url, current_url)::
|
||||
that ELinks should follow, or `nil` to cancel the operation.
|
||||
|
||||
follow_url_hook (url)::
|
||||
This hook is passed the URL that Links is about to follow. It should
|
||||
This hook is passed the URL that ELinks is about to follow. It should
|
||||
return a string (the URL modified or unmodified), or `nil` to stop
|
||||
ELinks following the URL
|
||||
|
||||
@ -173,7 +173,7 @@ lua_console_hook (string)::
|
||||
`someprogram`.
|
||||
- `return "eval", "somefunction(1+2)"` will attempt to call the Lua
|
||||
function `somefunction` with an argument, 3.
|
||||
- `return "goto_url", "http://www.bogus.com"` will ask Links to visit
|
||||
- `return "goto_url", "http://www.bogus.com"` will ask ELinks to visit
|
||||
the URL "http://www.bogus.com".
|
||||
- `return nil` will do nothing.
|
||||
|
||||
@ -188,7 +188,7 @@ Functions
|
||||
As well as providing hooks, ELinks provides some functions in addition to the
|
||||
standard Lua functions.
|
||||
|
||||
Note: The standard Lua function `os.setlocale` affects ELinks' idea of
|
||||
NOTE: The standard Lua function `os.setlocale` affects ELinks' idea of
|
||||
the system locale, which ELinks uses for the "System" charset, for the
|
||||
"System" language, and for formatting dates. This may however have to
|
||||
be changed in a future version of ELinks, in order to properly support
|
||||
@ -219,21 +219,28 @@ current_document_formatted ([width])::
|
||||
pipe_read (command)::
|
||||
Executes `command` and reads in all the data from stdout, until there
|
||||
is no more. This is a hack, because for some reason the standard Lua
|
||||
function `read` seems to crash ELinks when used in pipe-reading mode.
|
||||
function `file:read` seems to crash ELinks when used in pipe-reading
|
||||
mode.
|
||||
|
||||
execute (string)::
|
||||
Executes shell commands `string` without waiting for it to exit. Beware
|
||||
that you must not read or write to stdin and stdout. And unlike the
|
||||
standard Lua function of the same name, the return value is
|
||||
meaningless.
|
||||
standard Lua function `os.execute`, the return value is meaningless.
|
||||
|
||||
tmpname ()::
|
||||
Returns a unique name for a temporary file, or `nil` if no
|
||||
such name is available. The returned string includes the
|
||||
directory name. This function does not create the file and
|
||||
does not guarantee exclusive access to it: the caller must
|
||||
handle the possibility that another process creates the file
|
||||
and begins using it while this function is returning.
|
||||
directory name. Unlike the standard Lua function
|
||||
`os.tmpname`, this one generates ELinks-related names
|
||||
(currently with "elinks" at the beginning of the name).
|
||||
+
|
||||
WARNING: The `tmpname` function does not create the file and does not
|
||||
guarantee exclusive access to it: the caller must handle the
|
||||
possibility that another process creates the file and begins
|
||||
using it while this function is returning. Failing to do this
|
||||
may expose you to symlink attacks by other users. To avoid
|
||||
the risk, use `io.tmpfile` instead; unfortunately, it does not
|
||||
tell you the name of the file.
|
||||
|
||||
bind_key (keymap, keystroke, function)::
|
||||
Currently, `keymap` must be the string `"main"`. Keystroke is a
|
||||
@ -329,49 +336,48 @@ dialog box, and it will convert them to the URL I actually want to visit. As
|
||||
a bonus, it allows me perform some searches on sites like Google without
|
||||
loading up the front page first.
|
||||
|
||||
TIP: The ``URI rewriting'' feature of ELinks handles many of the same
|
||||
tasks as the Lua hook shown here, and you can conveniently configure
|
||||
it via the option manager. It is not quite as versatile, though.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
function match (prefix, url)
|
||||
return strsub (url, 1, strlen (prefix)) == prefix
|
||||
return string.sub (url, 1, string.len (prefix)) == prefix
|
||||
end
|
||||
|
||||
function strip (str)
|
||||
return gsub (str, "^%s*(.-)%s*$", "%1")
|
||||
return string.gsub (str, "^%s*(.-)%s*$", "%1")
|
||||
end
|
||||
|
||||
function plusify (str)
|
||||
return gsub (str, "%s", "+")
|
||||
return string.gsub (str, "%s", "+")
|
||||
end
|
||||
|
||||
function goto_url_hook (url, current_url)
|
||||
-- Google search (e.g. ,gg unix browsers).
|
||||
if match (",gg", url) then
|
||||
url = plusify (strip (strsub (url, 4)))
|
||||
url = plusify (strip (string.sub (url, 4)))
|
||||
return "http://www.google.com/search?q="..url.."&btnG=Google+Search"
|
||||
|
||||
-- Freshmeat search.
|
||||
elseif match (",fm", url) then
|
||||
url = plusify (strip (strsub (url, 4)))
|
||||
url = plusify (strip (string.sub (url, 4)))
|
||||
return "http://www.freshmeat.net/search/?q="..url
|
||||
|
||||
-- Appwatch search (e.g. ,aw lynx).
|
||||
elseif match (",aw", url) then
|
||||
url = plusify (strip (strsub (url, 4)))
|
||||
return "http://www.appwatch.com/Linux/Users/find?q="..url
|
||||
|
||||
-- Dictionary.com search (e.g. ,dict congenial).
|
||||
elseif match (",dict", url) then
|
||||
url = plusify (strip (strsub (url, 6)))
|
||||
url = plusify (strip (string.sub (url, 6)))
|
||||
return "http://www.dictionary.com/cgi-bin/dict.pl?db=%2A&term="..url
|
||||
|
||||
-- RPM search (e.g. ,rpm links).
|
||||
elseif match (",rpm", url) then
|
||||
url = plusify (strip (strsub (url, 5)))
|
||||
url = plusify (strip (string.sub (url, 5)))
|
||||
return "http://www.rpmfind.net/linux/rpm2html/search.php?query="
|
||||
..url.."&submit=Search+..."
|
||||
|
||||
-- Netcraft.com search (e.g. ,whatis www.google.com).
|
||||
elseif match (",whatis", url) then
|
||||
url = plusify (strip (strsub (url, 8)))
|
||||
url = plusify (strip (string.sub (url, 8)))
|
||||
return "http://uptime.netcraft.com/up/graph/?host="..url
|
||||
|
||||
-- LinuxToday home page.
|
||||
@ -380,7 +386,7 @@ function goto_url_hook (url, current_url)
|
||||
|
||||
-- Weather forecast for Melbourne, Australia.
|
||||
elseif match (",forecast", url) then
|
||||
return "http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDF02V00.txt"
|
||||
return "http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDV10450.txt"
|
||||
|
||||
-- Unmatched
|
||||
else
|
||||
@ -389,9 +395,6 @@ function goto_url_hook (url, current_url)
|
||||
end
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
(Note that this was noticably enhanced and rewritten in the ELinks standart
|
||||
hooks.)
|
||||
|
||||
|
||||
Expanding ~ (tilde)
|
||||
^^^^^^^^^^^^^^^^^^^
|
||||
@ -402,21 +405,16 @@ and `~user/zappo`, like in the shell
|
||||
and other Unix programs.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- Home directory: If you do not enable system functions, you will need
|
||||
-- to set the following to your home directory.
|
||||
|
||||
home_dir = (getenv and getenv ("HOME")) or "/home/MYSELF"
|
||||
|
||||
function goto_url_hook (url, current_url)
|
||||
.
|
||||
.
|
||||
|
||||
-- Expand ~ to home directories.
|
||||
elseif match ("~", url) then
|
||||
if strsub(url, 2, 2) == "/" then -- ~/foo
|
||||
return home_dir..strsub(url, 2)
|
||||
else -- ~foo/bar
|
||||
return "/home/"..strsub(url, 2)
|
||||
if string.sub(url, 2, 2) == "/" then -- ~/foo
|
||||
return os.getenv ("HOME")..string.sub(url, 2)
|
||||
else -- ~foo/bar
|
||||
return "/home/"..string.sub(url, 2)
|
||||
end
|
||||
|
||||
.
|
||||
@ -436,16 +434,16 @@ use ELinks Lua support to manipulate the HTML before it reaches the parser.
|
||||
linuxtoday.com
|
||||
++++++++++++++
|
||||
|
||||
Note: This recipe is out of date.
|
||||
NOTE: This recipe is out of date for the web site.
|
||||
|
||||
Linux Today has two problems when viewed in ELinks: the useless columns on the
|
||||
left and the right and all the text appears in cyan. Here is a quick recipe
|
||||
to fix that:
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- Plain strfind (no metacharacters)
|
||||
-- Plain string.find (no metacharacters)
|
||||
function sstrfind (s, pattern)
|
||||
return strfind (s, pattern, 1, 1)
|
||||
return string.find (s, pattern, 1, true)
|
||||
end
|
||||
|
||||
function pre_format_html_hook (url, html)
|
||||
@ -453,15 +451,15 @@ function pre_format_html_hook (url, html)
|
||||
-- and change the font colour to white.
|
||||
if sstrfind (url, "linuxtoday.com") then
|
||||
if sstrfind (url, "news_story") then
|
||||
html = gsub (html, '<TABLE CELLSPACING="0".-</TABLE>', '', 1)
|
||||
html = gsub (html, '<TR BGCOLOR="#FFF.-</TR></TABLE>', '', 1)
|
||||
html = string.gsub (html, '<TABLE CELLSPACING="0".-</TABLE>', '', 1)
|
||||
html = string.gsub (html, '<TR BGCOLOR="#FFF.-</TR></TABLE>', '', 1)
|
||||
else
|
||||
html = gsub (html, 'WIDTH="120">\n<TR.+</TABLE></TD>', '>', 1)
|
||||
html = string.gsub (html, 'WIDTH="120">\n<TR.+</TABLE></TD>', '>', 1)
|
||||
end
|
||||
html = gsub (html, '<A HREF="http://www.internet.com.-</A>', '')
|
||||
html = gsub (html, "<IFRAME.-</IFRAME>", "")
|
||||
html = string.gsub (html, '<A HREF="http://www.internet.com.-</A>', '')
|
||||
html = string.gsub (html, "<IFRAME.-</IFRAME>", "")
|
||||
-- emphasis in text is lost
|
||||
return gsub (html, 'text="#002244"', 'text="#001133"', 1)
|
||||
return string.gsub (html, 'text="#002244"', 'text="#001133"', 1)
|
||||
end
|
||||
|
||||
return nil
|
||||
@ -471,6 +469,8 @@ end
|
||||
linuxgames.com
|
||||
++++++++++++++
|
||||
|
||||
NOTE: This recipe is out of date for the web site.
|
||||
|
||||
Here is a simpler example, for link:http://www.linuxgames.com/[].
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
@ -478,8 +478,8 @@ function pre_format_html_hook (url, html)
|
||||
.
|
||||
.
|
||||
|
||||
elseif strfind (url, "linuxgames.com", 1, 1) then
|
||||
return gsub (html, "<CENTER>.-</center>", "", 1)
|
||||
elseif string.find (url, "linuxgames.com", 1, true) then
|
||||
return string.gsub (html, "<CENTER>.-</center>", "", 1)
|
||||
|
||||
.
|
||||
.
|
||||
@ -489,25 +489,27 @@ function pre_format_html_hook (url, html)
|
||||
Reading gzipped files
|
||||
^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
Note: ELinks already supports gzipped files natively.
|
||||
NOTE: ELinks already supports gzipped files natively.
|
||||
|
||||
Sometimes documents come gzipped in order to save space, but then you need to
|
||||
uncompress them to read them with ELinks. Here is a recipe to handle gzipped
|
||||
files on a Unix system.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- This script requires system functions.
|
||||
WARNING: This recipe opens a temporary file insecurely.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
function pre_format_html_hook (url, html)
|
||||
.
|
||||
.
|
||||
|
||||
-- Handle gzip'd files within reasonable size.
|
||||
if strfind (url, "%.gz$") and strlen (html) < 65536 then
|
||||
local tmp = tmpname ()
|
||||
writeto (tmp) write (html) writeto ()
|
||||
html = pipe_read ("(gzip -dc "..tmp.." || cat "..tmp..") 2>/dev/null")
|
||||
remove (tmp)
|
||||
if string.find (url, "%.gz$") and string.len (html) < 65536 then
|
||||
local name = tmpname ()
|
||||
local file = io.open (name, "wb")
|
||||
file:write (html)
|
||||
file:close ()
|
||||
html = pipe_read ("(gzip -dc "..name.." || cat "..name..") 2>/dev/null")
|
||||
os.remove (name)
|
||||
return html
|
||||
end
|
||||
|
||||
@ -530,25 +532,27 @@ using `lpr' or `enscript'. Type `lpr()` or `enscript()` in the Lua Console to
|
||||
run them. (In the `hooks.lua`, I have also made it so you can just type `lpr`
|
||||
or `enscript`.)
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- This script requires system functions.
|
||||
NOTE: The `io.popen` function is not available on all platforms.
|
||||
|
||||
function catto (output)
|
||||
writeto (output)
|
||||
write (current_document_formatted (79))
|
||||
writeto ()
|
||||
-------------------------------------------------------------------------------
|
||||
function pipe_formatted_to (program)
|
||||
local lp, errmsg = io.popen (program, "w")
|
||||
if lp == nil then
|
||||
error (errmsg)
|
||||
else
|
||||
lp:write (current_document_formatted (79))
|
||||
lp:close ()
|
||||
end
|
||||
end
|
||||
|
||||
-- Send the current document to `lpr'.
|
||||
function lpr ()
|
||||
-- You must compile Lua with `popen' support for pipes to work.
|
||||
-- See `config' in the Lua distribution.
|
||||
catto ("|lpr")
|
||||
pipe_formatted_to ("lpr")
|
||||
end
|
||||
|
||||
-- Send the current document to `enscript'.
|
||||
function enscript ()
|
||||
catto ("|enscript -fCourier8")
|
||||
pipe_formatted_to ("enscript -fCourier8")
|
||||
end
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
@ -560,9 +564,9 @@ If you come across a brain-dead web page that is totally unreadable with
|
||||
ELinks, you'd probably want to open it with a graphical browser. The
|
||||
following function opens the current document in Netscape.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- This function requires `execute', a system function.
|
||||
TIP: You can also use the built-in ``URI passing'' feature for this.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- When starting Netscape: Set to `nil' if you do not want
|
||||
-- to open a new window for each document.
|
||||
netscape_new_window = 1
|
||||
@ -580,13 +584,12 @@ Alternative bookmark system
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
Many people would like to have a bookmark system with categories (note that
|
||||
ELinks already supports that, marketing name Hiearchical bookmarks), and also
|
||||
ELinks already supports that, marketing name Hierarchical bookmarks), and also
|
||||
to be able to view them and search for them in an HTML page. I have written
|
||||
an alternative bookmark system (for ELinks), which some people may like better
|
||||
than the standard bookmark system.
|
||||
|
||||
|
||||
|
||||
More ideas
|
||||
^^^^^^^^^^
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user