I am programming for using eclipse as an IDE to program in a different language. I have implemented custom content-assist feature using eclipse using the org.eclipse.jface.text.contentassist.IContentAssistProcessor package. You can see my output below with the “__XXXXX” functions being displayed as someone types anything based on the context.
How can I display function details of a custom function. I mean, the type of help that can been seen in normal functions. I want to give an useful information about these functions.

See
ICompletionProposal.getAdditionalProposalInfo()andICompletionProposalExtension5.getAdditionalProposalInfo(...). Eclipse contains several examples on how to implement these.