Enhance workspace viewer

[renkun-ken]

What problem did you solve?

Closes #1018

This PR renames the global environment watcher to workspace watcher and includes search() and loadedNamespaces() in the writing of workspace.json instead of the previous globalenv.json. The following are improved:

• The workspace viewer contains more information of the R workspace: attached namespaces, loaded namespaces, and global environment symbols.
• The global environment symbols now get proper icons consistent with their completion item icons.
• Clicking the package:foo items in Attached Namespaces or items in Loaded Namespaces will show quick pick of help topics of that package.

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Kapture.2022-03-04.at.20.58.33.mp4

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[renkun-ken]

I'm trying to give those attached packages and loaded namespaces commands so that clicking them will trigger a quick pick of topics for that package. But it does not seem to be easily achievable with the existing help manager. @ManuelHentschel Any thoughts?

[ElianHugh]

Thanks for the PR, this is super cool :) I will have a look at this in a few hours - the main thing I'd like to check is the liveshare functionality

[renkun-ken]

I'm trying to give those attached packages and loaded namespaces commands so that clicking them will trigger a quick pick of topics for that package. But it does not seem to be easily achievable with the existing help manager. @ManuelHentschel Any thoughts?

Resolved. Now clicking the package:foo items in Attached Namespaces or items in Loaded Namespaces will show quick pick of help topics of that package.

[ElianHugh]

I tried with LiveShare and everything seems to work nicely :)

Small nitpick - would it make sense to have the 'Global Environment' node expanded instead of closed by default? At present, it requires a click upon startup. This would be closer to the RStudio implementation of showing the global env by default

[renkun-ken]

Small nitpick - would it make sense to have the 'Global Environment' node expanded instead of closed by default? At present, it requires a click upon startup. This would be closer to the RStudio implementation of showing the global env by default

It is expanded by default. See https://github.com/REditorSupport/vscode-R/pull/1022/files#diff-dc026a6295ecf05710e5e88e39d5a1a77d2d67c0a8e21b3ec2e23a6b97b985a1R37.

[renkun-ken]

Now attached packages in "Loaded Namespaces" will display "attached" in the description:

[renkun-ken]

Now if r.session.watchGlobalEnvironment is disabled, the "Global Environment" node will not show in the workspace viewer.

[ElianHugh]

The tooltip for the namespaces can be a little superfluous, e.g.

Would it be viable to have the result of packageDescription(package)[["Description"]] as the tooltip?

[renkun-ken]

Would it be viable to have the result of packageDescription(package)[["Description"]] as the tooltip?

I thought about this. To avoid overhead, we don't want to write the package description to workspace.json repeatedly. The package information could be obtained from globalRHelp but it looks like the package nodes are only populated when the nodes need to be displayed. Therefore, in the workspace viewer, I delayed forcefully populating those populated nodes to when it is clicked.

If we put the package description in the tooltip, then we need to forcefully populate globalRHelp's package index earlier, when the workspace viewer needs to populate tree items. Let me see if it works nicely.

[renkun-ken]

Would it be viable to have the result of packageDescription(package)[["Description"]] as the tooltip?

Done via ac44caa.