prezto/modules/git/functions/git-hub-browse

#
# Opens a GitHub repository in the default browser.
#
# Authors:
#   Sorin Ionescu <sorin.ionescu@gmail.com>
#

# function git-hub-browse {

if ! is-true "$(command git rev-parse --is-inside-work-tree 2> /dev/null)"; then
  print "$0: not a repository work tree: $PWD" >&2
  return 1
fi

local remotes remote references reference file url

remote="${1:-origin}"
remotes=($(command git remote show))

if (( $remotes[(i)$remote] == $#remotes + 1 )); then
  print "$0: remote not found: $remote" >&2
  return 1
fi

url=$(
  command git remote get-url "$remote" \
      | sed -En "s#(git@|https?://)(github.com)(:|/)(.+)/(.+)\.git#https://\2/\4/\5#p"
)

reference="${${2:-$(git-branch-current)}:-HEAD}"
references=(
  HEAD
  ${${(f)"$(command git ls-remote --heads --tags "$remote")"}##*refs/(heads|tags)/}
)

if (( $references[(i)$reference] == $#references + 1 )); then
  print "$0: branch or tag not found: $reference" >&2
  return 1
fi

if [[ "$reference" == 'HEAD' ]]; then
  reference="$(command git rev-parse HEAD 2> /dev/null)"
fi

file="$3"

if [[ -n "$url" ]]; then
  url="$url/tree/$reference/$file"

  if [[ -n "$BROWSER" ]]; then
    "$BROWSER" "$url"
    return 0
  else
    print "$0: browser not set or set to a non-existent browser" >&2
    return 1
  fi
else
  print "$0: not a Git repository or remote not set" >&2
  return 1
fi

# }