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Implement tail -n 20 in pure Ruby #59

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merged 1 commit into from
Aug 3, 2015
Merged

Implement tail -n 20 in pure Ruby #59

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12 changes: 11 additions & 1 deletion lib/airbrussh/capistrano/tasks.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ def deploy_failed
error_line(yellow("** Refer to #{log_file} for details. "\
"Here are the last 20 lines:"))
error_line
error_line(`tail -n 20 #{log_file.shellescape} 2>&1`)
error_line(tail_log_file)
end

private
Expand Down Expand Up @@ -75,6 +75,16 @@ def err_console
def error_line(line="\n")
line.each_line(&err_console.method(:print_line))
end

# Returns a String containing the last 20 lines of the log file. Since
# this method uses a fixed-size buffer, fewer than 20 lines may be
# returned in cases where the lines are extremely long.
def tail_log_file
open(log_file) do |file|
file.seek(-[8192, file.size].min, IO::SEEK_END)
file.readlines.last(20).join
end
end
end
end
end