+# 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.
+#
+# GNU ls with colors available.
+if ls --color >/dev/null 2>&1; then
+ ls_env=
+ ls_color='--color'
+ ls_options=
+# Normal (BSD) ls with colors available.
+elif ls -G >/dev/null 2>&1; then
+ ls_env='CLICOLOR_FORCE=1'
+ ls_color='-G'
+ # Don't display hidden files by default when running as root. I use `la`
+ # for that.
+ ls_options='-I'
+# Simple ls with no colors.
+else
+ ls_env=
+ ls_color=
+ ls_options=
+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 shell/aliases .in simple_cpp \
+ LS_ENV LS_COLOR LS_OPTIONS COLUMN -- \
+ "$ls_env" "$ls_color" "$ls_options" "$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_i '/^alias grep=/ s/^/#/' shell/aliases
+fi
+
+generate screenrc .in cat