bible: fix dirname. Closes #76

README.md

@@ -1061,7 +1061,11 @@ Alternative to the `dirname` command.
 ```sh
 dirname() {
     # Usage: dirname "path"
-    printf '%s\n' "${1%/*}/"
+    dir=${1%%/}
+
+    [[ $dir == */* ]] || dir=.
+
+    printf '%s\n' "${dir%/*}"
 }
 ```
 
@@ -1069,10 +1073,10 @@ dirname() {
 
 ```shell
 $ dirname ~/Pictures/Wallpapers/1.jpg
-/home/black/Pictures/Wallpapers/
+/home/black/Pictures/Wallpapers
 
 $ dirname ~/Pictures/Downloads/
-/home/black/Pictures/
+/home/black/Pictures
 ```
 
 ## Get the base-name of a file path

manuscript/chapter19.txt

@@ -10,8 +10,8 @@ Surprisingly, `sleep` is an external command and not a `bash` built-in.
 
 ```sh
 read_sleep() {
-    # Usage: sleep 1
-    #        sleep 0.2
+    # Usage: read_sleep 1
+    #        read_sleep 0.2
     read -rt "$1" <> <(:) || :
 }
 ```

manuscript/chapter5.txt

@@ -9,7 +9,11 @@ Alternative to the `dirname` command.
 ```sh
 dirname() {
     # Usage: dirname "path"
-    printf '%s\n' "${1%/*}/"
+    dir=${1%%/}
+
+    [[ $dir == */* ]] || dir=.
+
+    printf '%s\n' "${dir%/*}"
 }
 ```
 
@@ -17,10 +21,10 @@ dirname() {
 
 ```shell
 $ dirname ~/Pictures/Wallpapers/1.jpg
-/home/black/Pictures/Wallpapers/
+/home/black/Pictures/Wallpapers
 
 $ dirname ~/Pictures/Downloads/
-/home/black/Pictures/
+/home/black/Pictures
 ```
 
 ## Get the base-name of a file path

test.sh

@@ -116,7 +116,7 @@ test_count() {
 
 test_dirname() {
     result="$(dirname "/home/black/Pictures/Wallpapers/1.jpg")"
-    assert_equals "$result" "/home/black/Pictures/Wallpapers/"
+    assert_equals "$result" "/home/black/Pictures/Wallpapers"
 }
 
 test_basename() {