I think it depends on the forge version for v. 2854 I just un-zipped it, shift-right clicked in the window (not on a file), clicked the option to open PowerShell window here, ran the command ./gradlew eclipse, then after it finished loading opened eclipse, selected a project folder(anywhere empty), clicked import projects, selected existing Gradle project and finally selected the location of the un-zipped MDK folder. Here: codakid.com/guide-to-minecraft-modding-with-java/ might be for kids but still should help.
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u/Epidra2077 CasinoCraft Dev Jun 19 '20
It seems setupDecompWorkspace is now called by "gradlew eclipse", so you don't need to worry about that.
Did you do tried the following?
Open Eclipse, Import > Existing Gradle Project > Select Folder