generates the github URL of the topmost file in xcode

xcode_to_github.sh

#!/bin/zsh
# this script outputs the github URL of the frontmost file in Xcode.
# v0.2

if [[ -z $(which jq) ]]; then
  echo install jq with \'brew install jq\'
  exit 1
fi

TUPLE=$(osascript << HERE
    tell application "Xcode"
    set doc to document 1 whose name ends with (word -1 of (get name of window 1))
    set currentLines to selected paragraph range of doc
    set L1 to get item 1 of currentLines
    set L2 to get item 2 of currentLines
    return path of doc & "," & L1 & "," & L2
    end tell
HERE
)
IFS=\, read -r filePath L1 L2 <<< ${TUPLE}

[[ -f "$filePath" ]] || (echo "no such file: $filePath"; exit 1)

if [[ "$filePath" =~ DerivedData ]]; then
    # swift package manager
    FPATH=${filePath#*checkouts/}
    REPOS_DIR=${filePath%SourcePackages*}SourcePackages
    ID=${FPATH%/Sources/*}
    echo ID=$ID
    FPATH=${FPATH#$ID*}
    WSSTATE=${REPOS_DIR}/workspace-state.json
    SPM=$(jq ".object.dependencies[] | select( .packageRef.identity == \"${ID}\" ) | { id:.packageRef.identity, loc:.packageRef.location, rev:.state.checkoutState.revision, vers:.state.checkoutState.version }" < $WSSTATE)
    REV=$(echo $SPM | jq -r '.rev')
    URL=$(echo $SPM | jq -r '.loc')
else
    # file in git local working directory
    cd "$(dirname ${filePath})"
    URL=$(git remote get-url origin)
    URL=${URL%.git}
    REV=$(git rev-parse HEAD)
    FPATH=$(git ls-files --full-name ${filePath})
fi

TFM=${URL}/blob/${REV}/${FPATH} # TFM: the full monty

if [[ -n ${L1} ]]; then
    TFM=${TFM}\#L${L1}
fi
if [[ -n ${L2} ]]; then
    TFM=${TFM}\-L${L2}
fi

TFM=${TFM// /%20} # escape ' ' to '%20'

echo $TFM