initial commit

README.md

@@ -0,0 +1,72 @@
+## PURE BASH
+
+
+### Getting the terminal size (*in a script*).
+
+This is handy when writing scripts in pure bash and `stty`/`tput` can’t be
+called.
+
+```shell
+get_term_size() {
+    # Usage: get_term_size
+
+    # (:;:) is a micro sleep to ensure the variables are
+    # exported immediately.
+    shopt -s checkwinsize; (:;:)
+    printf '%s\n' "$LINES $COLUMNS"
+}
+```
+
+
+### Convert a hex color to RGB
+
+```shell
+hex_to_rgb() {
+    # Usage: hex_to_rgb "#FFFFFF"
+    ((r=16#${1:1:2}))
+    ((g=16#${1:3:2}))
+    ((b=16#${1:5:6}))
+
+    printf '%s\n' "$r $g $b"
+}
+```
+
+
+### Convert an RGB color to hex.
+
+```shell
+rgb_to_hex() {
+    # Usage: rgb_to_hex "r" "g" "b"
+    printf '#%02x%02x%02x\n' "$1" "$2" "$3"
+}
+```
+
+
+### `printf` as a `date` replacement.
+
+Bash’s `printf` has a built-in method of getting the date which we can use
+in place of the `date` command in a lot of cases.
+
+**NOTE:** Requires bash4+
+
+```shell
+date() {
+    # Usage: date "format"
+    # See: 'man strftime' for format.
+    printf "%($1)T\\n"
+}
+```
+
+
+### `dirname`
+
+Extract the directory from a file path.
+
+```shell
+dirname() {
+    # Usage: dirname "path"
+    printf ‘%s\n’ "${1%/*}/"
+}
+```
+
+