Re: [Monotone-devel] head selector

[Thomas Moschny]

On Friday 22 July 2005 18:48, Richard Levitte - VMS Whacker wrote:
> thomas.moschny> Is there a way to implement something like the earlier
> thomas.moschny> discussed 'h:' selector in lua in monotonerc?
>
> Actually, if you're so inclined, you might want to check out the
> branch net.venge.monotone.levitte.select-heads-of.  h: is implemented
> there.  I do not see a way to do it through a lua hook.

Well, statements like these are always - tempting :-)

The following lua code sniplet does something very similar, it replaces 
'head:some_branch' with 'i:first_head_revision', but it's ugly (and works 
only on unix):

local orig_expand_selector = expand_selector
function expand_selector (str)
  if string.find(str,"^head:") then
    str = string.sub(str, string.len("head:") + 1)
    local f, fname = temp_file()
    if f ~= nil then
      local rev = nil
      local stat = execute("sh", "-c", 
          "monotone automate heads " .. str .. ">".. fname)
      if stat == 0 then
          rev = f:read()
      end
      os.remove(fname)
      if rev ~= nil then 
        return "i:" .. rev 
      end
    end
  end 
  return orig_expand_selector(str)
end

Unfortunately neither does the execute() function honor a preceeding 
io.output(fname) statement, nor does the monotone have an output redirection 
option a la '-o',  thus the ugly 'sh -c with redirection' hack.

Of course it could be more cleaner if one could call the monotone's automation 
interface directly from lua scripts ... 

Regards,
Thomas

-- 
Thomas Moschny  <address@hidden>

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