Let's try to use a temporary file, other ways are not very clear to me yet.
```lua
local aTemplate = 'sort -f "$TMPFILE"'
local sTmpFile, sTmpStr, bFullText, sCommand
local aFileInfo = geany.fileinfo()
if aFileInfo.ext == nil then
sTmpFile = os.tmpname() .. ".txt"
else
sTmpFile = os.tmpname() .. aFileInfo.ext
end
local iStart, iStop = geany.select()
local h = io.open(sTmpFile, "wb")
if h == nil then
geany.message("Fail 1.")
return
end
sTmpStr = geany.selection()
if sTmpStr == nil then
geany.message("Fail 2.")
return
elseif sTmpStr == "" then
sTmpStr = geany.text()
bFullText = true
end
h:write(sTmpStr)
h:close()
sCommand = string.gsub(sTemplate, "%$TMPFILE", sTmpFile)
h = io.popen(sCommand, "r")
if h == nil then
geany.message("Fail 3.")
return
end
sTmpStr = h:read("*a")
h:close()
sTmpStr = string.gsub(sTmpStr, "\r*[\r\n]$", "")
if bFullText == true then
geany.text(sTmpStr)
geany.select(iStart)
else
geany.selection(sTmpStr)
geany.select(iStart, iStop)
end
geany.message("Done.")
```
See the template in the value of the `sTemplate` variable (first line). If you
want to use, for example, `grep`, then try
```lua
local sTemplate = 'cat "$TMPFILE" | grep "some text"'
```
Probably, in this case it is better to use the `geany.choose` function instead
of separate scripts.
Try with and without selection.
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