Created
June 18, 2014 20:36
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file system abstraction for crystal
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macro collect_alias_method(method, type) | |
def {{method}} | |
res = [] of {{type}} | |
{{method}} do |e| | |
res << e | |
end | |
res | |
end | |
end | |
module FS | |
module FileContainer | |
def files(&block : FileEntry -> U) | |
entries do |e| | |
block.call(e) if e.is_a?(FileEntry) | |
end | |
end | |
collect_alias_method "files", "FileEntry" | |
def dirs(&block : DirectoryEntry -> U) | |
entries do |e| | |
block.call(e) if e.is_a?(DirectoryEntry) | |
end | |
end | |
collect_alias_method "dirs", "DirectoryEntry" | |
end | |
class Entry | |
def initialize(@fs, @path) | |
end | |
# the name of the file or directory | |
def name | |
File.basename(@path) | |
end | |
# the relative path from the filesystem | |
# requesting this path to the filesystem | |
# should get an equivalent entry | |
def path | |
@path | |
end | |
def file? | |
false | |
end | |
def dir? | |
false | |
end | |
end | |
class FileEntry < Entry | |
def file? | |
true | |
end | |
def read | |
@fs.read(path) | |
end | |
end | |
class DirectoryEntry < Entry | |
include FileContainer | |
def dir? | |
true | |
end | |
def open(file_name) | |
@fs.open(scoped_file_name(file_name)) | |
end | |
def entries(&block : Entry+ -> U) | |
@fs.find_entries(scoped_file_name(""), &block) | |
end | |
collect_alias_method "entries", "Entry+" | |
# private | |
def scoped_file_name(file_name) | |
@fs.combine path, file_name | |
end | |
end | |
class FileSystem | |
include FileContainer | |
def combine(a, b) | |
if b.empty? | |
a | |
else | |
"#{a}/#{b}" | |
end | |
end | |
end | |
class FileSystemDirectory < FileSystem | |
def initialize(@path) | |
end | |
def read(file_name) | |
File.read scoped_file_name(file_name) | |
end | |
def entries(&block : Entry+ -> U) | |
find_entries("", &block) | |
end | |
collect_alias_method "entries", "Entry+" | |
def find_entries(path, &block : Entry+ -> U) | |
Dir.list(scoped_file_name(path)) do |entry, type| | |
next if entry == "." || entry == ".." | |
block.call(create_entry(combine(path, entry), type)) | |
end | |
end | |
collect_alias_method "find_entries(path)", "Entry+" | |
# private | |
def create_entry(entry, type) | |
if type == C::DirType::DIR | |
DirectoryEntry.new(self, entry) | |
# else | |
elsif type == C::DirType::REG | |
FileEntry.new(self, entry) | |
else | |
raise "not implemented" | |
end | |
end | |
def scoped_file_name(file_name) | |
combine @path, file_name | |
end | |
end | |
end | |
fs = FS::FileSystemDirectory.new("/Users/bcardiff/Work/Manas/crystal/src") | |
puts fs.read("min.c") | |
# fs.find_entries("samples") do |f| | |
# puts f.name | |
# puts f.path | |
# exit | |
# end | |
# fs.entries do |a| | |
# if a.is_a?(FS::DirectoryEntry) && a.name == "samples" | |
# a.entries do |e| | |
# puts e.path | |
# if e.is_a?(FS::FileEntry) | |
# puts "#{e.name}, #{e.path}" | |
# end | |
# end | |
# end | |
# end | |
puts fs.files.first.name | |
a = fs.dirs.select { |a| a.name == "samples" }.first | |
e = a.files.first | |
puts "#{e.name}, #{e.path}" |
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