NeoVim runs part of mapping while starting

Question

I am using a Raspberry Pi for learning C. I use NeoVim and Mingw-GCC on the Pi over SSH. Building is done with a custom script named build. Initial builds were done by calling ./build from the command mode of nvim.

I want to map Ctrl-B to call the build script. Currently I am using this

noremap <C-b> :w | !./build

but everytime I run vim, it seems to be running the build script.

Removing the w | seems to solve the problem but then I have to manually save the file before running.

I want it to just startup normally. And save before building.

Answer 1

The bar | is used to separate {lhs} and {rhs}. Thus it reads the next command as a command to run. To use a <bar> in keymaps:

   use       works when            example  ~
   <Bar>     '<' is not in 'cpoptions'     :map _l :!ls <Bar> more^M
   \|        'b' is not in 'cpoptions'     :map _l :!ls \| more^M
   ^V|       always, in Vim and Vi     :map _l :!ls ^V| more^M