reads package:cabal-install
A parser for a type
a, represented as a function that takes a
String and returns a list of possible parses as
(a,String) pairs.
Note that this kind of backtracking parser is very inefficient;
reading a large structure may be quite slow (cf
ReadP).
Converts a Haskell ReadS-style function into a parser. Warning: This
introduces local backtracking in the resulting parser, and therefore a
possible inefficiency.
Read the .cabal files for a set of packages. For remote
tarballs and VCS source repos this also fetches them if needed.
Note here is where we convert from project-root relative paths to
absolute paths.