mirror of
https://github.com/hasura/graphql-engine.git
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52 lines
1.5 KiB
Bash
52 lines
1.5 KiB
Bash
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#!/usr/bin/env bash
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# This runs `hpack`, but generates a custom header that instructs the reader not to edit the file.
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# It instead tells them to edit package.yaml and run a specific `make` command.
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set -e
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set -u
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set -o pipefail
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root_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]:-$0}")/.." &> /dev/null && pwd 2> /dev/null)"
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function usage {
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echo >&2 'Usage:'
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echo >&2 " ${BASH_SOURCE[0]} [--check] TARGET"
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echo >&2
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# shellcheck disable=SC2016
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echo >&2 '--check: Do not write the file; instead verify that it is up-to-date.'
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echo >&2 'TARGET: The Cabal file to be generated from package.yaml in the same directory.'
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exit 2
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}
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# Prefix the target file with a custom header.
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function modify {
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# Write the Cabal version information first; it must be before any comments.
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awk "{ print }; NR == 2 { print \"-- This file is generated using hpack.\n-- Do not modify it directly. Instead, edit package.yaml and then run:\n-- make ${target}\n\" }"
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}
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if [[ "$1" == '--check' ]]; then
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check=true
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shift
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else
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check=false
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fi
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if [[ $# -ne 1 ]]; then
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usage
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fi
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# The target must be relative to the root of the project for the `make` command to be meaningful.
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target="$(realpath --relative-to="$root_dir" "$1")"
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source="$(dirname "$target")"
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if $check; then
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output="$(mktemp -t "$(basename "$target").XXXXX")"
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trap 'rm -f "$output"' EXIT
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hpack "$source" - | modify > "$output"
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# `git diff` will return a non-zero exit status if the files are different.
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git diff --no-index "$target" "$output"
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else
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hpack "$source" - | modify > "$target"
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fi
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