Using Pandoc as a (github flavoured) Markdown formatter with wrapping support

gfmfmt.fish

#!/usr/bin/env fish 

# You can do something similar in fish too

function gfmfmt
      for I in $argv
            set -lx TEMPORARY_FILE (mktemp -d)"/"(basename "$I")
            pandoc --from=gfm --to=gfm --wrap=auto "$I" > "$TEMPORARY_FILE"
            mv "$TEMPORARY_FILE" "$I"
      end
end


gfmfmt something.md somethingelese.md

gfmfmt.sh

#!/usr/bin/env bash 

# This will work in ZSH & Bash too
# I have this in my .zshrc and .bashrc

function gfmfmt() {
  for I in "$@"; do
    TEMPORARY_FILE="$(mktemp -d)/$(basename "$I")"
    pandoc --from=gfm --to=gfm --wrap=auto "$I" >"$TEMPORARY_FILE"
    mv "$TEMPORARY_FILE" "$I"
  done
}

## Use it like
gfmfmt something.md somethingelese.md