Error detected while processing ~/.vim/pack/plugins/start/clrzr/autoload/clrzr.vim:

I am trying to install a fork of the colorizer plugin. It has minimal requirements, awk being one. But I seem to run in a bunch of errors.

line   31:
E492: Not an editor command: const s:RXFLT = '%(\d*\.)?\d+'
line   34:
E492: Not an editor command: const s:RXPCT = '%(\d*\.)?\d+\%'
line   37:
E492: Not an editor command: const s:RXPCTORFLT = '%(\d*\.)?\d+\%?'
line   40:
E492: Not an editor command: const s:CMMA = '\s*,\s*'
line  554:
E492: Not an editor command: const s:CLRZR_AWK_SCRIPT_PATH = expand('<sfile>:p:h') . '/clrzr.awk'
Error detected while processing function clrzr#Enable:
line   22:
E121: Undefined variable: s:CLRZR_AWK_SCRIPT_PATH
E116: Invalid arguments for function job_start( ['awk', '-f', s:CLRZR_AWK_SCRIPT_PATH], job_opts)
line   27:
E121: Undefined variable: s:awk_job
E116: Invalid arguments for function job_getchannel(s:awk_job)
line   28:
E121: Undefined variable: s:awk_chan
E116: Invalid arguments for function string(s:awk_chan) == 'channel fail'
line   86:
E216: No such group or event: SafeState * call s:SafeStateUpdate()

The plugin can be accessed here: https://github.com/BourgeoisBear/clrzr

Additionally, I am attaching the raw file that errors out: https://raw.githubusercontent.com/BourgeoisBear/clrzr/master/autoload/clrzr.vim

Solution

:help :const was introduced in patch 8.1.1539. If your Vim doesn't recognize it, then it means that it is too old for that plugin.

You can either…

use the original version of the plugin, which doesn't seem to be using too many new features,
or make your own backward-compatible fork of that fork,
or upgrade Vim to a more recent version.

I would go with the third option.

Additionally, you might want to ask the author of that fork to clearly state the plugin's requirements.