[Gulliby]

Requested by gulliby

Before. A shape had to be written part by part, so a long run of equal parts such as 4,3,3,3,3,1 was tedious and error-prone to type.

After. Wherever a shape is read (rank, conjugate, hooks, compare, neighbors, syt, core), a token may be written PARTxCOUNT; 4,3x2,1 is 4,3,3,1. Commands print the shape spelled out, and their other output is unchanged:

$ youngkit rank 4,3x2,1
shape       4,3,3,1
size        11
rank        32
of          56

Malformed runs, a count outside 1 to 5000, and ordering errors (reported at the spelled-out position) give clear messages, for example youngkit: invalid count "0" in "3x0" (expected 1 to 5000). The total size is computed with math/big before anything is expanded, so 5000x5000 is rejected without building a huge list.

How. internal/shape/shape.go (Parse, same signature and check order) and a new internal/shape/runs.go helper that reads one token. The README gains one paragraph. New tests: internal/shape/runs_test.go (8) and internal/cli/runs_test.go (3); existing tests are unchanged.