Colorize diff input using ANSI escape codes

diffcolor

#!/usr/bin/sed -f
## Colorize diff input with ANSI color escape codes

###############
###  Input  ###
###############

# All formats
/^Binary files.*differ$/bf
/^Only in.*/bf
/^diff .*/bd

# Classic diff
/^< .*/br
/^> .*/ba
/^---$/bc
/^[0-9]\{1,\}a[0-9]\{1,\}\(,[0-9]\{1,\}\)\{0,1\}$/bc
/^[0-9]\{1,\}\(,[0-9]\{1,\}\)\{0,1\}d[0-9]\{1,\}$/bc
/^[0-9]\{1,\}\(,[0-9]\{1,\}\)\{0,1\}c[0-9]\{1,\}\(,[0-9]\{1,\}\)\{0,1\}$/bc

# Combined diff
/^\*\{15\}$/bs
/^\([*-]\)\{3\} .* \1\{4\}$/bc
/^[*-]\{3\} .*/bd
/^! .*/bm

# Unified diff
/^[-+]\{3\} .*/bd
/^-.*/br
/^+.*/ba
/^@@ -[0-9]\{1,\},[0-9]\{1,\} +[0-9]\{1,\},[0-9]\{1,\} @@$/bc

################
###  Output  ###
################

# 30 = black
# 31 = red
# 32 = green
# 33 = yellow
# 34 = blue
# 35 = magenta
# 36 = cyan

# File difference
:f;s//^[[1;30m&^[[0m/;t

# Removed line
:r;s//^[[31m&^[[0m/;t

# Added line
:a;s//^[[32m&^[[0m/;t

# Descriptor
:d;s//^[[33m&^[[0m/;t

# Modified line
:m;s//^[[34m&^[[0m/;t

# Separator line
:s;s//^[[35m&^[[0m/;t

# Context marker
:c;s//^[[36m&^[[0m/;t