Draw.io - how to export all tabs to images using command line - draw.io

Question

I have installed on my PC draw.io app. I want to export all tabs with drawings to seperate files. The only options I have found is:
"c:\Program Files\draw.io\draw.io.exe" --crop -x -f jpg c:\Users\user-name\Documents\_xxx_\my-file.drawio
Help for draw.io
Usage: draw.io [options] [input file/folder]
Options:
(...)
-x, --export export the input file/folder based on the
given options
-r, --recursive for a folder input, recursively convert
all files in sub-folders also
-o, --output <output file/folder> specify the output file/folder. If
omitted, the input file name is used for
output with the specified format as
extension
-f, --format <format> if output file name extension is
specified, this option is ignored (file
type is determined from output extension,
possible export formats are pdf, png, jpg,
svg, vsdx, and xml) (default: "pdf")
(default: 0)
-a, --all-pages export all pages (for PDF format only)
-p, --page-index <pageIndex> selects a specific page, if not specified
and the format is an image, the first page
is selected
-g, --page-range <from>..<to> selects a page range (for PDF format only)
(...)
is not supporting. I can use one of this:
-p, --page-index <pageIndex> selects a specific page, if not specified
and the format is an image, the first page
is selected
-g, --page-range <from>..<to> selects a page range (for PDF format only)
but how to get page-range or number of pages to select index?

Answer 1

There is no easy way to find the number of pages out of the box with Draw.io's CLI options.
One solution would be export the diagram as XML.
draw.io --export --format xml --uncompressed test-me.drawio
And then count how many diagram elements there are. It should equal the number of pages (I briefly tested this but I'm not 100% sure if diagram element only appears once per page).
grep -o "<diagram" "test-me.xml" | wc -l
Here is an example of putting it all together in a bash script (I tried this on MacOS 10.15)
#!/bin/bash
file=test-me # File name excluding extension
# Export diagram to plain XML
draw.io --export --format xml --uncompressed "$file.drawio"
# Count how many pages based on <diagram element
count=$(grep -o "<diagram" "$file.xml" | wc -l)
# Export each page as an PNG
# Page index is zero based
for ((i = 0 ; i <= $count-1; i++)); do
draw.io --export --page-index $i --output "$file-$i.png" "$file.drawio"
done

Answer 2

OP did ask the question with reference to the Windows version, so here's a PowerShell solution inspired by eddiegroves
$DIR_DRAWIO = "."
$DrawIoFiles = Get-ChildItem $DIR_DRAWIO *.drawio -File
foreach ($file in $DrawIoFiles) {
"File: '$($file.FullName)'"
$xml_file = "$($file.DirectoryName)/$($file.BaseName).xml"
if ((Test-Path $xml_file)) {
Remove-Item -Path $xml_file -Force
}
# export to XML
& "C:/Program Files/draw.io/draw.io.exe" '--export' '--format' 'xml' $file.FullName
# wait for XML file creation
while ($true) {
if (-not (Test-Path $xml_file)) {
Start-Sleep -Milliseconds 200
}
else {
break
}
}
# load to XML Document (cast text array to object)
$drawio_xml = [xml](Get-Content $xml_file)
# for each page export png
for ($i = 0; $i -lt $drawio_xml.mxfile.pages; $i++) {
$file_out = "$($file.DirectoryName)/$($file.BaseName)$($i + 1).png"
& "C:/Program Files/draw.io/draw.io.exe" '--export' '--border' '10' '--page-index' $i '--output' $file_out $file.FullName
}
# wait for last file PNG image file
while ($true) {
if (-not (Test-Path "$($file.DirectoryName)/$($file.BaseName)$($drawio_xml.mxfile.pages).png")) {
Start-Sleep -Milliseconds 200
}
else {
break
}
}
# remove/delete XML file
if ((Test-Path $xml_file)) {
Remove-Item -Path $xml_file -Force
}
# export 'vsdx' & 'pdf'
& "C:/Program Files/draw.io/draw.io.exe" '--export' '--format' 'vsdx' $file.FullName
Start-Sleep -Milliseconds 1000
& "C:/Program Files/draw.io/draw.io.exe" '--export' '--format' 'pdf' $file.FullName
}