go(): reformat ridiculous pipeline and document it

functions

@@ -13,9 +13,18 @@ function go()
   findopts=(-type d -maxdepth 4)
   excludes='.cocoapods|.vim/bundle'
 
-  # find -H -> follow symlinks
-  dir=$(find -H $base ${findopts[*]} -path '*/.git' 2>/dev/null | sed 's,/.git$,,' | grep -vE "$excludes" | xargs -I{} stat -f '%m %N' '{}' | sort -nr | sed -E 's,^[0-9]+ ,,' | sed -E "s,^$base/(src/)?,," | sed 's,/.git$,,' | selecta)
+  dir=$(
+    find -H $base ${findopts[*]} -path '*/.git' 2>/dev/null \ # find all git repositories ('-H' means follow symlinks)
+      | sed 's,/.git$,,' \                                    # strip the .git suffix
+      | grep -vE "$excludes" \                                # exclude some noise
+      | xargs -I{} stat -f '%m %N' '{}' | sort -nr \          # sort by most recently modified
+      | sed -E 's,^[0-9]+ ,,' \                               # strip the prefixed modification time
+      | sed -E "s,^$base/(src/)?,," \                         # remove the directory prefix for display
+      | sed 's,/.git$,,' \                                    # strip .git suffix (again?)
+      | selecta
+  )
 
+  # after selecting a project, expand it back out to its full path and jump to it
   if [ -n "$dir" ]; then
     dest=$base/$dir
     if [ ! -d "$dest" ]; then