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