Programmatically list a VI's dependencies (subVIs) recursively

In a large application I am developing I use VI Server calls to load VIs into memory. However, I recently came across a problem which is causing a bit of a headache. I've been able to successfully load and execute, using VI Server, a series of VIs (which are kind of like plugins). That is, all except for one. This odd VI loads up, gets its front panel inserted into a subpanel control, but is reportedly Execution State = Bad. According to the help, this means the VI is broken and cannot run.
Now, my supporting framework ensures that missing dependencies are requested when loading a VI using server calls, ie if a dependency cannot be found the familiar Browse dialogue appears, and indeed during development I've seen this happen a number of times. Therefore I know this latest VI is not missing any dependencies because it doesn't ask me to point it to any, and I know the VI should be working because it opens and executes fine when running in the development environment.
So, what I figure I need to do is programmatically determine which of the VI's dependencies (subVIs) are at fault. I've not done this before so I'm not sure where to start, I guess scripting will be necessary, but:
Is there an easy way to programmatically list a VI's dependencies (subVIs) recursively?
With such a list I should be able to examine each for the one(s) that are broken and get to the bottom of this conundrum. I'm hoping there are some unpublished codes that ship with LabVIEW I can harness for this.
Any help most appreciated!
Thoric (CLA, CLED, CTD and LabVIEW Champion)
Solved!
Go to Solution.

Thanks!
I was stupidly looking at a VI Properties node, not Method node, so I couldn't see it. Not sure why it doesn't appear in my help though, as I have those checkboxes ticked in Options. Maybe I mistyped something...
Anyways, that's great, thank you both!
Thoric (CLA, CLED, CTD and LabVIEW Champion)

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BR.

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url="https://github.com/colinkeenan/silentcast"
license=('GPL')
depends=('ffmpeg' 'imagemagick' 'yad' 'xorg-xrandr' 'wmctrl' 'xdotool' 'xorg-xwininfo' 'python-gobject' 'python-cairo' 'xdg-utils')
install=${pkgname}.install
source=('silentcast' 'genffcom' 'temptoanim' 'transparent_window.py' 'silentcast.desktop' 'README.md')
md5sums=('de05e0140e4640bf0b52077f4ade5a26'
'3b7311751662d8bd3034e4720239b070'
'6ce4638b3358ca388838cf650083a528'
'6bf9e695750a3f65e4421544c53bdb96'
'f1641d3959f479a97b6bcd26f103f900'
'539141058e7f8bcb99218e632a817e1e')
package() {
install -D -m755 silentcast "$pkgdir/usr/bin/silentcast"
install -D -m755 genffcom "$pkgdir/usr/bin/genffcom"
install -D -m755 temptoanim "$pkgdir/usr/bin/temptoanim"
install -D -m755 transparent_window.py "$pkgdir/usr/share/silentcast/transparent_window.py"
install -D -m755 silentcast.desktop "$pkgdir/usr/share/applications/silentcast.desktop"
install -D -m755 README.md "$pkgdir/usr/share/doc/silentcast/README.md"
Last edited by colinkeenan (2014-09-22 05:56:37)

colinkeenan wrote:The specific answer I was looking for and hoping namcap would give me had to do with xdg-open from the xdg-utils package. I use it to open the desktop's file-browser. On the Packages page for xdg-utils, optional dependencies are listed according to what desktop it's being run on. So, for example, I use Xfce and it lists 'exo' and 'xorg-xprop' as optional dependencies. I have no idea if those optional dependencies are actually required in order for my script to open the file-browser in Xfce.
How can you not know? Do you use exo or xprop in the script or not? If you only use xdg-open, then only specify that as a dependency. Users can then figure out which specific tools they wish to use to satisfy that dependency. I use my own replacement for xdg-open, and if I wanted I could package it listing "xdg-open" in the provides array so your tool would then call my xdg-open replacement tool. It's not up to you to worry about how other users chose to implement xdg-open unless your scripts depend on a specific implementation.
Much the same could be bash. If your script uses a bash hashbang, then bash is a dependency. If you use a "sh" hashbang than any shell will do - but then you must use only posix shell commands and conditionals - there are a lot of "bashisms" that will not work in other shells (e.g. the [[ bash builtin for conditionals). But even if bash is a dependency it does not need to be listed: you should not list dependencies that are in base or base-devel.
On a related question that you touched on in this thread, you do not need to list recursive dependencies. If you list python modules that have python as a hard dependency, then you do not need to list python. But just like the 'bashisms' example above, if you use a specific version of python (2.7 or 3) these are generally not compatible. The modules might not care which python is installed to meet it's needs, but your script may require a specific implementation of python. In such a case, you'd have to specify which python you used in addition to the python module(s).
EDIT:
Bear in mind I just whipped this up on the spot, and I have no idea how reliable it is - but in principle the following line should find dependencies for any script or anything else for that matter - provided that simply running the script/command will use everything that is required:
pacman -Qqo $(strace ./script 2>&1 | awk '/^(open|stat|access)/ {sub(/[a-z]*\("/,"",$1); sub(/",/,"",$1); print $1}') 2>/dev/null | sort -u
This is assuming the script is in the current working directory and named "script". I'll put together a more flexible and useful version momentarily.

Demlo - A dynamic and extensible music library organizer (in pure Lua)

Demlo organizes your music library automatically and dynamically. It runs a chain of user-defined scripts using variables such as tags and file properties. This way it yields virtually unlimited customization power to the user.
Use case
As an example, consider a music library that is a a perfect definition of chaos:
No folder structure.
Tags are not homogeneous, some entries are filled, other not, it varies from file to file.
Some files have bad audio quality.
Audio codecs are not always the same. Some file are CBR/VBR, lossless/lossy, ...
mp3's ID3 tags are a nightmare.
Covers are sometimes embedded in tags, others are of terrible quality.
Features
A few scripts are already provided and they give a good example of what you can do. You can choose to use them, to rewrite them, or to write a new script from scratch. You can preview changes, and once you are done you call the program over you music library, it will process everything in one single run!
Scripts can be chained: this feature makes Demlo extremely flexible and powerful!
Move all files according to a unique, yet dynamic folder hierarchy. For
instance, setting
output.filename = table.concat {library, '/', o.artist, '/',
not empty (o.album) and (empty (o.date) and o.album .. '/' or o.date .. ' - ' .. o.album .. '/') or '',
empty (track_padded) and '' or track_padded .. ' - ',
o.title}
will move "john doe - 1. intro.ogg" to
"/home/$USER/music/John Doe/2013 - Great Album/01 - Intro.ogg" if there is an album and a date,
"/home/$USER/music/John Doe/Great Album/01 - Intro.ogg" if there is an album and no date,
"/home/$USER/music/John Doe/01 - Intro.ogg" if there is no album.
Case checking: a powerful script that will turn everything to title case. It supports special cases such as Roman numerals, McDonald, etc. It also supports a list of exceptions (e.g. AC-DC, DJ, feat., etc.).
Encoding: you can conditionally re-encode you files, so you can choose to only re-encode files with some particular encoding settings. You can set the desired bitrate, etc.
Covers: automatically remove embedded covers, remove duplicates, remove files beyond/below a quality threshold, etc.
Different kinds of music: classical, OST, and band songs have usually different kinds of tags and folder structures. You can manage different audio libraries easily by setting the corresponding "library" variables.
Edit tags of a file set with your favorite text editor.
Support for cue sheets. (Both external and embedded.)
Demlo can be interfaced with any other program, both ways. (X calls Demlo or Demlo calls X.)
MusicBrainz support for online tagging and cover fetching.
Technical characteristics
This program is completely written in Lua. Its only major dependency is FFmpeg. A few Lua modules are required, which should not eat more than a few KiB on your drive. This leads to a lightweight codebase for a portable and extensible program.
Dependencies
ffmpeg
lua (>= 5.1)
lua-dkjson
lua-filesystem
lua-llthreads2
lua-penlight
lua-socket
slnunicode
chromaprint (optional)
History
This program is based on Musish by the same author.
The original program was written in POSIX shell but suffured from many limitations as well as performance issues. It was rewritten in Lua to circumvent all those issues while applying minor changes to the CLI options and to the variable names. The syntax of the script changed to Lua as well. Here follows a list of major changes:
Traversing folders recursively is no longer a security issue.
Overall performance got boosted by a factor of approx. 2.
Scripts and configuration files are sandboxed, which means they can no longer contain harmful code. However it is no longer possible to chain scripts.
All tags are processed dynamically, no more hard-coded tags.
Links
Official web page
Arch Wiki
AUR package
Issue tracker: Please file bug reports there thanks!
Last edited by Ambrevar (2015-02-20 09:22:22)

I hoped the structure I presented was clear enough. No, all/majority of tags would be a little too much, but genre, different release types, file types and some other basic distinctions, yes and tagsfs will probably help with that. There are special folders like [Compilation], [High Voltage SID Collection] and probably others in the future, maybe with help of tagsfs. Compilations and Artists are prepended by the leading letter of 'sorted artists/albums' level. Then albums/artists are sorted/presented in the manner visible in the Picard script:
$if($eq(%compilation%,1),
%COMPILATION%///%FIRSTLETTER%///$if2(%ALBUM%,%NONALBUMTRACKS%,[Other]) - $if(%DATE%,[%DATE%],),
%FIRSTLETTER%///$trim($if2(%ALBUMARTIST%,%ARTIST%),.)///$if(%DATE%,%DATE% - ,)$if2(%ALBUM%,%NONALBUMTRACKS%,[Other]) )
$if(%RELEASETYPE%,[%RELEASETYPE%],)%BARCODE%$if(%INCOMPLETE%,[%INCOMPLETE%],)[%EXT%]///
$if(%DISCNUMBER%,%DISCNUMBER%-,)%TRACKNUMBER%. %ARTIST% - %TITLE%
Picard has preview examples, so copying the whole script into file naming script under options should make this definitely clear.
Ambrevar wrote:Thinking about it, a similar feature is provided by most library managers where you can choose filters and tree structure and so on. It remains virtual though, it does not touch the filesystem. Is it really necessary to you to have that sort of view directly on your filesystem? The problem of the filesystem view seems very complex to me.
Not all devices provide that capability. It is more pleasant to work with that approach than previous structures I used, remember that I can restructure the whole library at any time and probably copy the local one elsewhere using the new structure, but I have not looked into that yet.
We probably have very different experiences, I see this as very comfortable and convenient. Before that I had been using folders for different file types in the main directory, but it ended up with so many entries for FLAC and MP3, that parsing that directories in a player or any maintenance using a file browser/terminal was too troublesome/slow. So I reduced the number of files, by using the alphabet and additional characters as sorting mechanism. And since that was one step away from separating compilations from albums/single releases, I did that also. Now I can access the whole library very quickly, even when one or two additional characters need to be typed.
Ambrevar wrote:Furthermore, would you consider this to be an automated task or a manual one? Using your example, how can a program know that Lauge & Baba Gnohm is both Lauge and Baba Gnohm if no tags says so?
Both, I want as always full control. MusicBrainz [database] relations.
Ambrevar wrote:Hard links do not work for folders.
Symlinks cause problems with most file browsers that do not follow them during copying.
I do not recall writing they should link folders, the directory structure would have to be [re]build and then files [hard/sym]linked, which might pose a maintenance issue, although deleting links and empty directories not really, but "leftovers" like covers could block cleaning. *The only file browser* I would recommend is Proto from a very friendly Polish programmer named Mieszko Lassota, but it is, or at least was last time I checked, Windows only and slowly further developed, although still kills every mc, mucommander and ranger on sight, that is how I remember it. SpaceFM is bearable, but I still only use rsync to copy files and see no point using anything else.
Ambrevar wrote:Can you elaborate on this? What are the limitations of Picard beyond symlinking? It could be interesting to know what feature you would like.
The recursive/linking aspect it the main point here. I hope this is not too big of a disappointment. Having too long names has also been a problem in few cases, classical music if I recall correctly, but those are limitations of the file system, however even that could be overcome with Picard, but the code would not be as easily readable as it is now. The question would be what should be abbreviated/priorities, what to do when after abbreviation the directory/file names are still too long and so on. I had to do it by hand these few times. Picard does not handle covers/images well in my experience, but I used something else for that, puddletag I think. I would have to continue to organize the library to remember.
Furthermore, not all media players/organizers do have the capability to get exactly this structure with formatting, leading letters and distinction between compilations and albums being two examples. Browsing this robust file structure with ncmpcpp is very efficient, I almost never use the library view. As long as a media player has the browsing capability, I have the same view/behavior. And other hardware also works without issues. Yes, it basically comes down to having the file system do, what media players should, however with a few exceptions I had only positive results for more than almost two years now. Do you now see benefits of having that file structure?
Again I will take a look at your tool, when I find some time and what progandy suggested also of course. How do you save your music on the file system?
Edit: Style. Clarification.
Last edited by emeres (2014-09-12 13:02:34)

Programmatically list a VI's dependencies (subVIs) recursively

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