Support for FreeBSD-style ls Coloring

If LSCOLORS is undefined or partially defined (missing some of the eleven expected
value pairs), the patch will automatically fill in those missing values with default
colors. However, if the LS_COLORS environment variable is already defined, the
application prefer the LS_COLORS approach, maintaining current working flow of the
program.

4 files changed, 31 insertions, 0 deletions

diff --git a/tests/bfs/color_bsd.out b/tests/bfs/color_bsd.out
new file mode 100644
index 0000000..f7c577c
--- /dev/null
+++ b/tests/bfs/color_bsd.out
@@ -0,0 +1,27 @@
+$'rainbow/\e[1m'
+$'rainbow/\e[1m/'$'\e[0m'
+rainbow
+rainbow/sugid
+rainbow/suid
+rainbow/sticky_ow
+rainbow/ow
+rainbow/sgid
+rainbow/exec.sh
+rainbow/socket
+rainbow/pipe
+rainbow/broken
+rainbow/chardev_link
+rainbow/link.txt
+rainbow/sticky
+rainbow/file.dat
+rainbow/file.txt
+rainbow/lower.gz
+rainbow/lower.tar
+rainbow/lower.tar.gz
+rainbow/lu.tar.GZ
+rainbow/mh1
+rainbow/mh2
+rainbow/ul.TAR.gz
+rainbow/upper.GZ
+rainbow/upper.TAR
+rainbow/upper.TAR.GZ
diff --git a/tests/bfs/color_bsd.sh b/tests/bfs/color_bsd.sh
new file mode 100644
index 0000000..f8a777f
--- /dev/null
+++ b/tests/bfs/color_bsd.sh
@@ -0,0 +1 @@
+LSCOLORS="eB" bfs_diff rainbow -color
diff --git a/tests/bfs/color_bsd_fail.sh b/tests/bfs/color_bsd_fail.sh
new file mode 100644
index 0000000..94e1209
--- /dev/null
+++ b/tests/bfs/color_bsd_fail.sh
@@ -0,0 +1,2 @@
+# LSCOLORS can be at most 22 characters long (11 color pairs); this one has 24.
+! LSCOLORS="exfxcxdxbxegedabagacadeB" invoke_bfs  rainbow -color
diff --git a/tests/util.sh b/tests/util.sh
index 1718a1a..c998927 100644
--- a/tests/util.sh
+++ b/tests/util.sh
@@ -34,6 +34,7 @@ stdenv() {
 
     export LS_COLORS=""
     unset BFS_COLORS
+    unset LSCOLORS
 
     if [ "$UNAME" = Darwin ]; then
         # ASan on macOS likes to report