+# Custom colors for GNU ls.
+if installed dircolors; then
+ echo '# WARNING! DO NOT EDIT THIS FILE!' > shell/dircolors
+ dircolors -b shell/dircolors.in >> shell/dircolors
+fi
+
+# Find the required options to get colored ls output. GNU ls is preferred. See
+# shell/aliases.in for details. Doing this here instead of in shell/aliases
+# speeds up shell starts.
+#
+# Check if colors are available.
+if ls --color > /dev/null 2>&1; then
+ ls_color=gnu
+else
+ if ls -G > /dev/null 2>&1; then
+ ls_color=cli
+ else
+ ls_color=
+ fi
+fi
+# Absolute path to `ls`.
+ls_path=`installed_path ls`
+# GNU ls with colors.
+if test "x$ls_color" = xgnu; then
+ ls_env=
+ ls_color='--color'
+# Normal (BSD) ls with colors.
+elif test "x$ls_color" = xcli; then
+ ls_env='CLICOLOR_FORCE=1'
+ ls_color='-G'
+# Simple ls with no colors.
+else
+ ls_env=
+ ls_color=
+fi
+
+# Also check if `column -t` is available.
+if echo test | column -t >/dev/null 2>&1; then
+ column=' | column -t'
+else
+ column=
+fi
+
+generate perl shell/aliases \
+ -e 'while (<STDIN>) {
+ s/\bLS_ENV\b/$ARGV[0]/;
+ s/\bLS_PATH\b/$ARGV[1]/;
+ s/\bLS_COLOR\b/$ARGV[2]/;
+ s/\bCOLUMN\b/$ARGV[3]/;
+ print;
+ }' \
+ "$ls_env" "$ls_path" "$ls_color" "$column"
+
+# If `tig` is not available use my simple replacement.
+if ! installed tig; then
+ echo "alias tig='git tig'" >>shell/aliases
+fi
+
+# Check if grep supports --color=auto.
+if echo test | grep --color=auto test >/dev/null 2>&1; then
+ :
+else
+ echo 'shell/aliases: removing grep --color=auto'
+ sed '/^alias grep=/ s/^/#/' shell/aliases > shell/aliases.tmp
+ mv shell/aliases.tmp shell/aliases
+fi
+