When running two or more instances of GHCi, persistent history is only kept for the first one
The file ~/.ghc/ghci_history maintains the command history for the first running GHCi instance. No persistent history is kept for concurrently running ghci processes. See #2050 (closed).
bash provides an option of setting shopt -s histappend, which makes all bash instances share the same history file. Perhaps writing to the same file would be somewhat silly in the case of GHCi, but writing to .ghci_history.2 or similar could be one solution.
Alternatively, a command within GHCi to dump the current instance's command history to a file would work also.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.10.4 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | GHCi |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |