ayosec · January 6, 2022 15:20 · Jan 6, 2022
diff --git a/remove-bright-colors.rb b/remove-bright-colors.rb
@@ -0,0 +1,93 @@
+#!/usr/bin/ruby
+
+CHILD_CMD = ARGV.dup
+
+# If either stdout or stderr is not a TTY, executes the program with no color
+# translation.
+
+if !STDOUT.tty? or !STDERR.tty?
+  exec(*CHILD_CMD)
+end
+
+
+# Map bright colors to the default color..
+
+COLOR_TABLE = {
+  "1"       => "0",
+
+  "38;5;9"  => "31",
+  "38;5;09" => "31",
+  "38;5;10" => "32",
+  "38;5;11" => "33",
+  "38;5;12" => "34",
+  "38;5;13" => "35",
+  "38;5;14" => "36",
+  "38;5;15" => "0",
+
+  "90"      => "30",
+  "91"      => "31",
+  "92"      => "32",
+  "93"      => "33",
+  "94"      => "34",
+  "95"      => "35",
+  "96"      => "36",
+  "97"      => "30",
+}
+
+require "pty"
+require "io/console"
+
+
+# Launch the program in a new TTY.
+
+master, slave = PTY.open
+master.winsize = STDOUT.winsize
+
+pid = fork do
+  STDIN.reopen("/dev/null")
+  STDOUT.reopen(slave)
+  STDERR.reopen(slave)
+  exec(*CHILD_CMD)
+end
+
+slave.close
+
+
+# Forward signals
+
+trap "TERM" do
+  Process.kill("TERM", pid)
+end
+
+trap "SIGWINCH" do
+  master.winsize = STDOUT.winsize
+end
+
+
+# Main loop.
+#
+# Read up to 1024 bytes from the TTY, and replace colors (CSI color m) if they
+# are found in COLOR_TABLE.
+#
+# If a sequence is at the end of the input it may be incomplete. In such case,
+# it will not be replaced. This should be very unlikely for most CLI programs.
+loop do
+  begin
+    line = master.
+      readpartial(1024).
+      gsub(/\e\[([0-9;]+?)m/) { "\e[#{COLOR_TABLE[$1] || $1}m" }
+
+    print line
+
+  rescue Errno::EIO
+    break
+
+  rescue Interrupt
+    Process.kill("INT", pid)
+    puts
+
+  end
+end
+
+Process.waitpid(pid)
+exit $?.exitstatus || 1
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