Optionally colored and fuzzy findable godoc

godoc.zsh

### colored and fuzzy go doc
if which bat > /dev/null; then
  function _godoc() {
    if echo $1|grep -q -E "([a-zA-Z0-9/.-_]+)/.*\..*"; then
      go doc ${@} | bat -p -l go
    else
      go doc ${@} | bat -p -l md
    fi
  }
else
  function _godoc() {
    go doc ${@}
  }
fi

function gomodroot() {
  . <(go env|grep -E "^GOMOD")
  echo ${GOMOD%%go.mod}
  unset GOMOD
}

function _godocbuildcache() {
  local VERSION="$(go version|awk '{print $3}')"
  local DOCCACHE="${GODOC_CACHE:-${HOME}/.cache/godoc}/${VERSION}"
  if [ -d ${DOCCACHE} ]; then
    return 0
  fi

  echo "generating stdlib godoc cache, wait some time" 1>&2

  mkdir -p ${DOCCACHE}
  for DEP in $(go list std|grep -v -E "internal/"); do
    go doc -short ${DEP}|sed -e 's/^\ *\(func\|type\|const\|var\)\ \([a-zA-Z0-9]\+\).*/\2/'|xargs -I {} echo ${DEP}.{} 2>/dev/null >> ${DOCCACHE}/stdlib.symbols
  done

  echo "done generating stdlib godoc cache" 1>&2
}

function _godocenum() {
  _godocbuildcache
  local VERSION="$(go version|awk '{print $3}')"
  local DOCCACHE="${GODOC_CACHE:-${HOME}/.cache/godoc}/${VERSION}"
  cat ${DOCCACHE}/stdlib.symbols

  for DEP in $(go list -f '{{ join .Deps "\n" }}' $(gomodroot)/...); do
    for SYM in $(go doc -short ${DEP}|sed -e 's/^\ *\(func\|type\|const\|var\)\ \([a-zA-Z0-9]\+\).*/\2/'); do
      echo ${DEP}.${SYM}
    done
  done
}

function godoc() {
  if [ $# -eq 0 ]; then
    if which bat > /dev/null; then
      OBJ=$(_godocenum|fzf --height=80% --info=inline --reverse --border --margin=1 --padding=1 --preview="go doc {1}|bat --color always -p -l go")
    else
      OBJ=$(_godocenum|fzf --height=80% --info=inline --reverse --border --margin=1 --padding=1 --preview="go doc {1}")
    fi
    _godoc ${OBJ}
  else
    _godoc ${@}
  fi
}

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