Very slow when printing with colors

[mohd-akram]

Describe the bug yq is very slow when printing a YAML file with colors.

Version of yq: 4.24.2 Operating system: macOS Installed via: MacPorts

Input Yaml big.zip

Command

time yq -C big.yaml

Actual behavior Command takes more than half a minute to finish.

real	0m36.762s
user	1m31.913s
sys	0m2.216s

Expected behavior Command completes in a couple seconds at most. For reference, time using the no colors flag -M:

real	0m0.382s
user	0m0.365s
sys	0m0.084s

[timotheecour]

looks like the runtime is at least quadatic with --colors

time yq -P -oy --no-colors ~/tmp/D20240430T175851_v4.yaml | wc -l 1091: 0.044 2191: 0.076 4157: 0.138

time yq -P -oy --colors ~/tmp/D20240430T175851_v4.yaml | wc -l 1091: 1.759 2191: 14.386 4157: 1:33.44

unfortunately, I couldn't use highlight (brew install highlight) as workaround: cat ~/tmp/D20240430T175851_v4.yaml | /home/linuxbrew/.linuxbrew/opt/highlight/bin/highlight --out-format xterm256 --syntax yaml produces bad formatting:

[timotheecour]

workaround1 : use moar

brew install moar

moar ~/tmp/D20240430T175851_v4.yaml cat ~/tmp/D20240430T175851_v4.yaml | moar --lang=yaml cat /pathto/foo.json | yq -P -oy | moar --lang=yaml

works correctly and fast

but see https://github.com/walles/moar/issues/207

workaround2 : use chroma

cat /pathto/foo.json | yq -P -oy | chroma --style=catppuccin-latte --lexer=yaml