add bash-it

dot_bash_it/plugins/available/history.plugin.bash

@@ -0,0 +1,36 @@
+# shellcheck shell=bash
+about-plugin 'improve history handling with sane defaults'
+
+# Append the history list to the file named by the value of the HISTFILE
+# variable when the shell exits, rather than overwriting the file.
+shopt -s histappend
+
+# 'ignorespace': don't save command lines which begin with a space to history
+# 'erasedups' (alternative 'ignoredups'): don't save duplicates to history
+# 'autoshare': automatically share history between multiple running shells
+: "${HISTCONTROL:=ignorespace:erasedups:autoshare}"
+
+# resize history to 100x the default (500)
+: "${HISTSIZE:=50000}"
+
+function top-history() {
+	about 'print the name and count of the most commonly run tools'
+
+	# - Make sure formatting doesn't interfer with our parsing
+	# - Use awk to count how many times the first command on each line has been called
+	# - Truncate to 10 lines
+	# - Print in column format
+	HISTTIMEFORMAT='' history \
+		| awk '{
+				a[$2]++
+			}END{
+				for(i in a)
+				printf("%s\t%s\n", a[i], i)
+			}' \
+		| sort --reverse --numeric-sort \
+		| head \
+		| column \
+			--table \
+			--table-columns 'Command Count,Command Name' \
+			--output-separator ' | '
+}