lsyncd/mantle/fwriter.lua

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2018-03-16 08:36:32 +00:00
--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- lsyncd.lua Live (Mirror) Syncing Demon
--
--
-- Writes functions for the user for layer 3 configurations.
--
--
-- This code assumes your editor is at least 100 chars wide.
--
-- License: GPLv2 (see COPYING) or any later version
-- Authors: Axel Kittenberger <axkibe@gmail.com>
--
--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if mantle
then
print( 'Error, Lsyncd mantle already loaded' )
os.exit( -1 )
end
--
-- All variables known to layer 3 configs.
--
transVars = {
{ '%^pathname', 'event.pathname', 1 },
{ '%^pathdir', 'event.pathdir', 1 },
{ '%^path', 'event.path', 1 },
{ '%^sourcePathname', 'event.sourcePathname', 1 },
{ '%^sourcePathdir', 'event.sourcePathdir', 1 },
{ '%^sourcePath', 'event.sourcePath', 1 },
{ '%^source', 'event.source', 1 },
{ '%^targetPathname', 'event.targetPathname', 1 },
{ '%^targetPathdir', 'event.targetPathdir', 1 },
{ '%^targetPath', 'event.targetPath', 1 },
{ '%^target', 'event.target', 1 },
{ '%^o%.pathname', 'event.pathname', 1 },
{ '%^o%.path', 'event.path', 1 },
{ '%^o%.sourcePathname', 'event.sourcePathname', 1 },
{ '%^o%.sourcePathdir', 'event.sourcePathdir', 1 },
{ '%^o%.sourcePath', 'event.sourcePath', 1 },
{ '%^o%.targetPathname', 'event.targetPathname', 1 },
{ '%^o%.targetPathdir', 'event.targetPathdir', 1 },
{ '%^o%.targetPath', 'event.targetPath', 1 },
{ '%^d%.pathname', 'event2.pathname', 2 },
{ '%^d%.path', 'event2.path', 2 },
{ '%^d%.sourcePathname', 'event2.sourcePathname', 2 },
{ '%^d%.sourcePathdir', 'event2.sourcePathdir', 2 },
{ '%^d%.sourcePath', 'event2.sourcePath', 2 },
{ '%^d%.targetPathname', 'event2.targetPathname', 2 },
{ '%^d%.targetPathdir', 'event2.targetPathdir', 2 },
{ '%^d%.targetPath', 'event2.targetPath', 2 },
}
--
-- Splits a user string into its arguments.
-- Returns a table of arguments
--
local function splitStr(
str -- a string where parameters are seperated by spaces.
)
local args = { }
while str ~= ''
do
-- break where argument stops
local bp = #str
-- in a quote
local inQuote = false
-- tests characters to be space and not within quotes
for i = 1, #str
do
local c = string.sub( str, i, i )
if c == '"'
then
inQuote = not inQuote
elseif c == ' ' and not inQuote
then
bp = i - 1
break
end
end
local arg = string.sub( str, 1, bp )
arg = string.gsub( arg, '"', '\\"' )
table.insert( args, arg )
str = string.sub( str, bp + 1, -1 )
str = string.match( str, '^%s*(.-)%s*$' )
end
return args
end
--
-- Translates a call to a binary to a lua function.
-- TODO this has a little too blocking.
--
local function translateBinary
(
str
)
-- splits the string
local args = splitStr( str )
-- true if there is a second event
local haveEvent2 = false
for ia, iv in ipairs( args )
do
-- a list of arguments this arg is being split into
local a = { { true, iv } }
-- goes through all translates
for _, v in ipairs( transVars )
do
local ai = 1
while ai <= #a
do
if a[ ai ][ 1 ]
then
local pre, post =
string.match( a[ ai ][ 2 ], '(.*)'..v[1]..'(.*)' )
if pre
then
if v[3] > 1
then
haveEvent2 = true
end
if pre ~= ''
then
table.insert( a, ai, { true, pre } )
ai = ai + 1
end
a[ ai ] = { false, v[ 2 ] }
if post ~= ''
then
table.insert( a, ai + 1, { true, post } )
end
end
end
ai = ai + 1
end
end
-- concats the argument pieces into a string.
local as = ''
local first = true
for _, v in ipairs( a )
do
if not first then as = as..' .. ' end
if v[ 1 ]
then
as = as .. '"' .. v[ 2 ] .. '"'
else
as = as .. v[ 2 ]
end
first = false
end
args[ ia ] = as
end
local ft
if not haveEvent2
then
ft = 'function( event )\n'
else
ft = 'function( event, event2 )\n'
end
ft = ft ..
" log('Normal', 'Event ', event.etype, \n" ..
" ' spawns action \"".. str.."\"')\n" ..
" spawn( event"
for _, v in ipairs( args )
do
ft = ft .. ',\n ' .. v
end
ft = ft .. ')\nend'
return ft
end
--
-- Translates a call using a shell to a lua function
--
local function translateShell
(
str
)
local argn = 1
local args = { }
local cmd = str
local lc = str
-- true if there is a second event
local haveEvent2 = false
for _, v in ipairs( transVars )
do
local occur = false
cmd = string.gsub(
cmd,
v[ 1 ],
function
( )
occur = true
return '"$' .. argn .. '"'
end
)
lc = string.gsub( lc, v[1], ']]..' .. v[2] .. '..[[' )
if occur
then
argn = argn + 1
table.insert( args, v[ 2 ] )
if v[ 3 ] > 1
then
haveEvent2 = true
end
end
end
local ft
if not haveEvent2
then
ft = 'function( event )\n'
else
ft = 'function( event, event2 )\n'
end
-- TODO do array joining instead
ft = ft..
" log('Normal', 'Event ',event.etype,\n"..
" [[ spawns shell \""..lc.."\"]])\n"..
" spawnShell(event, [["..cmd.."]]"
for _, v in ipairs( args )
do
ft = ft..',\n '..v
end
ft = ft .. ')\nend'
return ft
end
--
-- Writes a lua function for a layer 3 user script.
--
local function translate
(
str
)
-- trims spaces
str = string.match( str, '^%s*(.-)%s*$' )
local ft
if string.byte( str, 1, 1 ) == 47
then
-- starts with /
ft = translateBinary( str )
elseif string.byte( str, 1, 1 ) == 94
then
-- starts with ^
ft = translateShell( str:sub( 2, -1 ) )
else
ft = translateShell( str )
end
log( 'FWrite', 'translated "', str, '" to \n', ft )
return ft
end
--
-- Exporter interface.
--
FWriter = { translate = translate }