[feature request] add the previous version in the output.

[vdegenne]

I like to run sudo n latest every now and then to make sure I'm always on the last version of NodeJS. The problem with n is that it's not always apparent whether node got updated or not. And if it does it doesn't necessarily show what upgrade it got.
In the output it would be nice to also show the previous version, e.g.

  installing : node-v23.4.0
       mkdir : /usr/local/n/versions/node/23.4.0
       fetch : https://nodejs.org/dist/v23.4.0/node-v23.4.0-linux-x64.tar.xz
     copying : node/23.4.0
   installed : v23.4.0 (with npm 10.9.2)
   previous  : v23.3.0

[shadowspawn]

The problem with n is that it's not always apparent whether node got updated or not.

I am not sure what this means. But I understand n does not tell you if you are reinstalling the active version of node.

I'll clarify what you see when you install. When the target version is not already in the cache, like when a new version comes out, it is downloaded into the cache and installed (copied) into /usr/local (or N_PREFIX).

$ n latest
  installing : node-v23.4.0
       mkdir : /usr/local/n/versions/node/23.4.0
       fetch : https://nodejs.org/dist/v23.4.0/node-v23.4.0-darwin-arm64.tar.xz
     copying : node/23.4.0
   installed : v23.4.0 (with npm 10.9.2)

When the target version is already in the cache, it is copied into /usr/local (or N_PREFIX). No download required.

$ n ls
node/18.20.4
node/20.18.0
node/22.12.0
node/23.4.0
$ n latest
     copying : node/23.4.0
   installed : v23.4.0 (with npm 10.9.2)

We can also see/do the download and install separately for a new version:

$ n rm latest      
latest (23.4.0) not in downloads cache
$ n download latest
    download : node-v23.4.0
       mkdir : /usr/local/n/versions/node/23.4.0
       fetch : https://nodejs.org/dist/v23.4.0/node-v23.4.0-darwin-arm64.tar.xz
$ n install latest
     copying : node/23.4.0
   installed : v23.4.0 (with npm 10.9.2)

[vdegenne]

Thanks for the details.
I just meant to add the previous version it got updated from, for instance if I am on node v22.0.0 and use n latest it should show v22.0.0 somewhere before telling it got updated to v23.0.0 or something.

That's really just like adding node --version before anything got updated.

[vdegenne]

surprisingly even nvm haven't thought of adding this trivial information (trivial as in a versioning manager)