extract setup script that provides useful package metadata as environment variables. use ${BASH_SOURCE[0]} instead of $0 in that script, for when the script is sourced from outside the scripts directory (e.g. in CI)

Author: SillyFreak

scripts/package

@@ -4,6 +4,24 @@ set -eu
 # adapted from https://github.com/johannes-wolf/cetz/blob/35c0868378cea5ad323cc0d9c2f76de8ed9ba5bd/scripts/package
 # licensed under Apache License 2.0
 
+. "$(dirname "${BASH_SOURCE[0]}")/setup"
+
+if (( $# < 1 )) || [[ "${1:-}" == "help" ]]; then
+  echo "package TARGET"
+  echo ""
+  echo "Packages all relevant files into a directory named '<name>/<version>'"
+  echo "at TARGET. If TARGET is set to @local or @preview, the local Typst package"
+  echo "directory will be used so that the package gets installed for local use."
+  echo "The name and version are read from 'typst.toml' in the project root."
+  echo ""
+  echo "Local package prefix: $DATA_DIR/typst/package/local"
+  echo "Local preview package prefix: $DATA_DIR/typst/package/preview"
+  exit 1
+fi
+
+TARGET="$(resolve-target "${1:?Missing target path, @local or @preview}")"
+echo "Install dir: $TARGET"
+
 # ignore rules
 readarray -t ignores < <(grep -v '^#' .typstignore | grep '[^[:blank:]]')
 
@@ -49,49 +67,6 @@ function enumerate {
 readarray -t files < <(enumerate ".")
 # declare -p files >&2
 
-# Local package directories per platform
-if [[ "$OSTYPE" == "linux"* ]]; then
-  DATA_DIR="${XDG_DATA_HOME:-$HOME/.local/share}"
-elif [[ "$OSTYPE" == "darwin"* ]]; then
-  DATA_DIR="$HOME/Library/Application Support"
-else
-  DATA_DIR="${APPDATA}"
-fi
-
-if (( $# < 1 )) || [[ "${1:-}" == "help" ]]; then
-  echo "package TARGET"
-  echo ""
-  echo "Packages all relevant files into a directory named '<name>/<version>'"
-  echo "at TARGET. If TARGET is set to @local or @preview, the local Typst package"
-  echo "directory will be used so that the package gets installed for local use."
-  echo "The name and version are read from 'typst.toml' in the project root."
-  echo ""
-  echo "Local package prefix: $DATA_DIR/typst/package/local"
-  echo "Local preview package prefix: $DATA_DIR/typst/package/preview"
-  exit 1
-fi
-
-function read-toml() {
-  local file="$1"
-  local key="$2"
-  # Read a key value pair in the format: <key> = "<value>"
-  # stripping surrounding quotes.
-  perl -lne "print \"\$1\" if /^${key}\\s*=\\s*\"(.*)\"/" < "$file"
-}
-
-ROOT="$(cd "$(dirname "$0")"; pwd -P)/.." # macOS has no realpath
-TARGET="${1:?Missing target path, @local or @preview}"
-PKG_PREFIX="$(read-toml "$ROOT/typst.toml" "name")"
-VERSION="$(read-toml "$ROOT/typst.toml" "version")"
-
-if [[ "$TARGET" == "@local" ]]; then
-  TARGET="${DATA_DIR}/typst/packages/local"
-  echo "Install dir: $TARGET"
-elif [[ "$TARGET" == "@preview" ]]; then
-  TARGET="${DATA_DIR}/typst/packages/preview"
-  echo "Install dir: $TARGET"
-fi
-
 TMP="$(mktemp -d)"
 
 for f in "${files[@]}"; do

scripts/setup

@@ -0,0 +1,37 @@
+# source this script to prepare some common environment variables
+
+# adapted from https://github.com/johannes-wolf/cetz/blob/35c0868378cea5ad323cc0d9c2f76de8ed9ba5bd/scripts/package
+# licensed under Apache License 2.0
+
+# Local package directories per platform
+if [[ "$OSTYPE" == "linux"* ]]; then
+  DATA_DIR="${XDG_DATA_HOME:-$HOME/.local/share}"
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  DATA_DIR="$HOME/Library/Application Support"
+else
+  DATA_DIR="${APPDATA}"
+fi
+
+function read-toml() {
+  local file="$1"
+  local key="$2"
+  # Read a key value pair in the format: <key> = "<value>"
+  # stripping surrounding quotes.
+  perl -lne "print \"\$1\" if /^${key}\\s*=\\s*\"(.*)\"/" < "$file"
+}
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")"; pwd -P)/.." # macOS has no realpath
+PKG_PREFIX="$(read-toml "$ROOT/typst.toml" "name")"
+VERSION="$(read-toml "$ROOT/typst.toml" "version")"
+
+function resolve-target() {
+  local target="$1"
+
+	if [[ "$target" == "@local" ]]; then
+		echo "${DATA_DIR}/typst/packages/local"
+	elif [[ "$target" == "@preview" ]]; then
+		echo "${DATA_DIR}/typst/packages/preview"
+	else
+		echo "$target"
+	fi
+}

scripts/uninstall

@@ -4,19 +4,12 @@ set -eu
 # adapted from https://github.com/johannes-wolf/cetz/blob/35c0868378cea5ad323cc0d9c2f76de8ed9ba5bd/scripts/package
 # licensed under Apache License 2.0
 
-# Local package directories per platform
-if [[ "$OSTYPE" == "linux"* ]]; then
-  DATA_DIR="${XDG_DATA_HOME:-$HOME/.local/share}"
-elif [[ "$OSTYPE" == "darwin"* ]]; then
-  DATA_DIR="$HOME/Library/Application Support"
-else
-  DATA_DIR="${APPDATA}"
-fi
+. "$(dirname "${BASH_SOURCE[0]}")/setup"
 
 if (( $# < 1 )) || [[ "${1:-}" == "help" ]]; then
   echo "uninstall TARGET"
   echo ""
-  echo "removes the package installed into a directory named '<name>/<version>'"
+  echo "Removes the package installed into a directory named '<name>/<version>'"
   echo "at TARGET. If TARGET is set to @local or @preview, the local Typst package"
   echo "directory will be used so that the package gets installed for local use."
   echo "The name and version are read from 'typst.toml' in the project root."
@@ -26,26 +19,8 @@ if (( $# < 1 )) || [[ "${1:-}" == "help" ]]; then
   exit 1
 fi
 
-function read-toml() {
-  local file="$1"
-  local key="$2"
-  # Read a key value pair in the format: <key> = "<value>"
-  # stripping surrounding quotes.
-  perl -lne "print \"\$1\" if /^${key}\\s*=\\s*\"(.*)\"/" < "$file"
-}
-
-ROOT="$(cd "$(dirname "$0")"; pwd -P)/.." # macOS has no realpath
-TARGET="${1:?Missing target path, @local or @preview}"
-PKG_PREFIX="$(read-toml "$ROOT/typst.toml" "name")"
-VERSION="$(read-toml "$ROOT/typst.toml" "version")"
-
-if [[ "$TARGET" == "@local" ]]; then
-  TARGET="${DATA_DIR}/typst/packages/local/"
-  echo "Install dir: $TARGET"
-elif [[ "$TARGET" == "@preview" ]]; then
-  TARGET="${DATA_DIR}/typst/packages/preview/"
-  echo "Install dir: $TARGET"
-fi
+TARGET="$(resolve-target "${1:?Missing target path, @local or @preview}")"
+echo "Install dir: $TARGET"
 
 TARGET="${TARGET:?}/${PKG_PREFIX:?}/${VERSION:?}"
 echo "Package to uninstall: $TARGET"