Refactor `puts_columns`.

1 files changed, 49 insertions, 0 deletions

diff --git a/Library/Homebrew/utils/puts_columns.rb b/Library/Homebrew/utils/puts_columns.rb
new file mode 100644
index 000000000..94a5354ad
--- /dev/null
+++ b/Library/Homebrew/utils/puts_columns.rb
@@ -0,0 +1,49 @@
+require "utils/tty"
+
+class IO
+  def puts_columns(*objects, gap_size: 2)
+    objects.flatten!
+
+    if objects.empty? || !tty?
+      puts(*objects)
+      return
+    end
+
+    console_width = Tty.width
+
+    object_lengths = objects.map { |obj| Tty.strip_ansi(obj.to_s).length }
+
+    cols = (console_width + gap_size) / (object_lengths.max + gap_size)
+
+    if cols < 2
+      puts(*objects)
+      return
+    end
+
+    rows = (objects.count + cols - 1) / cols
+    cols = (objects.count + rows - 1) / rows # avoid empty trailing columns
+
+    col_width = (console_width + gap_size) / cols - gap_size
+
+    gap_string = "".rjust(gap_size)
+
+    rows.times do |row_index|
+      item_indices_for_row = row_index.step(objects.size - 1, rows).to_a
+
+      first_n = item_indices_for_row[0...-1].map { |index|
+        objects[index] + "".rjust(col_width - object_lengths[index])
+      }
+
+      # don't add trailing whitespace to last column
+      last = objects.values_at(item_indices_for_row.last)
+
+      puts (first_n + last).join(gap_string)
+    end
+  end
+end
+
+module Kernel
+  def puts_columns(*objects)
+    $stdout.puts_columns(*objects)
+  end
+end