devon build command not working correct for yarn or npm

[hohwille]

As discussed in PR #417 the command devon build for yarn or in other words the command devon yarn build is not working correct.
It invokes yarn build. However, dependencies may not be installed and not every project may have a build script.
IMHO the same applies for npm as well.

The JavaScript ecosystem is less standardized so there are no clear goals and guidelines for this (other than for maven or gradle).
To me the build of a project should behave a following:

• install dependencies (yarn install or npm install)
• run build script if present (yarn run build or npm run build if build section is present in scripts section of package.json)

[hohwille]

So to figure out if the package.json file actually contains a build script, I came up with this (ugly) bash pipe:

cat package.json | tr '\n' '§' | tr -d '\r' | grep -o "[\"']scripts[\"']\s*:\s*{\s*§.*[\"']build[\"']\s*:"

As we need support on all OS, we can not expect grep to support options like -z or -P.
I know we should avoid such ugly pipes as discussed in #358 but in this case:

• it is only called in this very specific situation (so performance is not really an issue)
• I do not see any alternative (except assuming that there is a build script included in package.json but that may not always be the case).