docs: update

2 files changed, 33 insertions, 1 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..270072e
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,32 @@
+# CONTRIBUTING
+
+# Variables
+
+| var     | meaning |
+| ------- | ------- |
+| LINES   | total lines in terminal. |
+| PWD     | current directory.
+| REPLY   | user input.
+| f[@]    | every dir item. |
+| c       | total number of dir items. |
+| g       | previous dir when navigating to a bookmark. |
+| j       | last dir item that fits on the screen. |
+| k       | first dir item that fits on the screen. |
+| l       | cursor position. |
+| l2[@]   | history of parent dirs (used to remember previous location). |
+| m       | number of lines that fit on the screen. |
+| n       | directory nest level. |
+
+# Functions
+
+| func      | meaning |
+| --------- | ------- |
+| refresh() | clear the screen and calculate window size. |
+| get_dir() | get the list of dir items from `$PWD`. |
+| f_print() | print the dir items to the terminal. |
+| path()    | get the absolute path of a path. |
+| hist()    | add a cursor position to the location history. |
+| open()    | navigate to a dir or open a file. |
+| prompt()  | handle user input. |
+| key()     | handle key-presses. |
+| main()    | set traps and start loop. |
diff --git a/fff b/fff
index 2dfa949..ee088f4 100755
--- a/fff
+++ b/fff
@@ -5,7 +5,7 @@
 refresh() {
     printf '\e[?7l\e[?25l\e[2J\e[H'
     shopt -s checkwinsize; (:;:)
-    ((LINES==0)) && read -r LINES COLUMNS < <(stty size)
+    ((LINES==0)) && read -r LINES _ < <(stty size)
     ((m=LINES-3,j=l>m/2?l>=c-m/2?c+1:l+m/2+1:m,k=k>=0?j-m:k,l=l>c?k:l))
 }