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Allow passing of GHC version; pull snapshot from cabal config #4

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Allow passing of GHC version; pull snapshot from cabal config #4

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957aba2
Allow passing of GHC version; make snapshot current
intercalations Feb 27, 2022
b4dee51
Fix handling of snapshot
intercalations Feb 28, 2022
739d785
Merge branch 'master' into ghc-and-snapshot
intercalations May 1, 2022
9f6495b
Prevent double quotes
intercalations May 1, 2022
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6 changes: 6 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,12 @@ mkdir myprojectname && cd myprojectname
init-haskell
```

The above will default to using GHC 8.10.7. If you'd like to use a different version, simply pass the full version as an argument:

```
init-haskell 9.2.1
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If you agree with the env var change:

Suggested change
init-haskell 9.2.1
INIT_HASKELL_GHC=9.2.1 init-haskell

```

### Build and run

```
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23 changes: 18 additions & 5 deletions init-haskell
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@@ -1,22 +1,35 @@
#! /usr/bin/env nix-shell
#! nix-shell --pure --keep NIX_SSL_CERT_FILE --keep GITHUB_TOKEN -i bash -p git mustache-go niv direnv nix
#! nix-shell --pure --keep NIX_SSL_CERT_FILE --keep GITHUB_TOKEN -i bash -p git mustache-go jq niv direnv nix
set -Eeuxo pipefail

# init-haskell location
base=$(dirname "$(readlink -f "$0")")

ghc=${1:-8.10.7}
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Thoughts on changing this to an env var INIT_HASKELL_GHC so people can set it in their profile (and we don't have to do arg parsing for further arguments)?

ghcparts=(${ghc//./ })
ghcmajor=${ghcparts[0]}
ghcminor=${ghcparts[1]}
ghcpatch=${ghcparts[2]}

snapshot="2022-01-01T00:00:00Z"
cabaltimestamp=~/.cabal/packages/hackage.haskell.org/timestamp.json

if [ -f $cabaltimestamp ]; then
snapshot=$(jq -r '.signed | select(._type == "Timestamp") | .expires' $cabaltimestamp)
fi

# Variables
data=$(mktemp)
projectname=${PWD##*/}
cat <<EOF >$data
{ "author": "$(git config user.name)"
, "email": "$(git config user.email)"
, "ghc":
{ major: 8
, minor: 10
, patch: 7
{ major: ${ghcmajor}
, minor: ${ghcminor}
, patch: ${ghcpatch}
}
, "snapshot": "2022-03-01T00:00:00Z"
, "snapshot": "${snapshot}"
, "projectname": "${projectname}"
}
EOF
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