Added filter-through module for shell commands.

1 files changed, 67 insertions, 0 deletions

diff --git a/modules/textadept/filter_through.lua b/modules/textadept/filter_through.lua
new file mode 100644
index 00000000..59dd1a42
--- /dev/null
+++ b/modules/textadept/filter_through.lua
@@ -0,0 +1,67 @@
+-- Copyright 2007-2010 Mitchell mitchell<att>caladbolg.net. See LICENSE.
+
+local L = _G.locale.localize
+
+---
+-- Filter-Through for the textadept module.
+module('_m.textadept.filter_through', package.seeall)
+
+local cat = not WIN32 and 'cat' or 'type'
+local tmpfile = _USERHOME..'/.ft'
+local filter_through_active = false
+
+---
+-- Prompts for a Linux, Mac OSX, or Windows shell command to filter text
+-- through. If text is selected, all text on the lines containing the selection
+-- is used as the standard input (stdin) to the command. Otherwise the entire
+-- buffer is used. Either the selected text or buffer is replaced with the
+-- standard output (stdout) of the command.
+function filter_through()
+  filter_through_active = true
+  gui.command_entry.entry_text = ''
+  gui.command_entry.focus()
+end
+
+events.connect('command_entry_keypress',
+  function(code)
+    if filter_through_active and code == 0xff1b then -- escape
+      filter_through_active = false
+    end
+  end, 1) -- place before command_entry.lua's handler (if necessary)
+
+events.connect('command_entry_command',
+  function(text) -- filter through
+    if filter_through_active then
+      local buffer = buffer
+      local s, e = buffer.selection_start, buffer.selection_end
+      local input
+      if s ~= e then -- use selected lines as input
+        s = buffer:position_from_line(buffer:line_from_position(s))
+        if buffer.column[e] > 0 then
+          e = buffer:position_from_line(buffer:line_from_position(e) + 1)
+        end
+        input = buffer:get_sel_text()
+      else -- use whole buffer as input
+        input = buffer:get_text()
+      end
+      local f = io.open(tmpfile, 'wb')
+      f:write(input)
+      f:close()
+      local cmd = table.concat({ cat, '"'..tmpfile..'"', '|', text }, ' ')
+      if WIN32 then cmd = cmd:gsub('/', '\\') end
+      local p = io.popen(cmd)
+      if s ~= e then
+        buffer.target_start, buffer.target_end = s, e
+        buffer:replace_target(p:read('*all'))
+        buffer:set_sel(buffer.target_start, buffer.target_end)
+      else
+        buffer:set_text(p:read('*all'))
+        buffer:goto_pos(s)
+      end
+      p:close()
+      os.remove(tmpfile)
+      filter_through_active = false
+      return true
+    end
+  end, 1) -- place before command_entry.lua's handler (if necessary)
+