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@olbat olbat/icu_info.cr
Last active May 5, 2017

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A Crystal program that returns information about the ICU install
require "xml"
require "c/dlfcn"
PKGNAME = "icu-uc"
TESTFUNC = "u_init"
{% if flag?(:darwin) %}
SOFILE = "libicuuc.dylib"
{% elsif flag?(:windows) %}
SOFILE = "libicuuc.dll"
{% else %}
SOFILE = "libicuuc.so"
{% end %}
def icu_version : String
version = nil
if system("command -v icuinfo > /dev/null")
icuinfo = `icuinfo -v`
begin
doc = XML.parse(icuinfo)
if params = doc.first_element_child
if params.name == "icuSystemParams" # ICU >= 49.0
params.children.select(&.element?).each do |param|
if param.name == "param" && param["name"]? == "version"
version = param.content.strip
break
end
end
elsif params.name == "ICUINFO" # ICU < 49.0
if v = params.content.match(/Compiled-Version\s*:\s*([0-9\.]+)/)
version = v[1]
end
end
end
rescue XML::Error
end
else
STDERR.puts %(WARNING: cannot find the "icuinfo" tool in PATH)
{% if flag?(:darwin) %}
STDERR.puts %(\t(on OSX, please check that you've run "brew link icu4c"))
{% end %}
end
if !version && system("command -v pkg-config > /dev/null")
version = `pkg-config --modversion #{PKGNAME}`.strip
end
abort("cannot find ICU version", 3) if !version || version.empty?
version
end
def icu_sem_version : String
# convert ICU version to semantic versioning
version = icu_version()
v = version.split(".")
if v.size == 3
version
elsif v.size > 3
v[0..2].join(".")
else
3.times.map { |i| v[i]? || "0" }.join(".")
end
end
def icu_possible_suffixes(version : String) : Array(String)
v = version.split(".")
[
"",
"_#{version}",
"_#{v[0]}",
"_#{v[0]}#{v[1]}",
"_#{v[0]}_#{v[1]}",
"_#{v[0][0]}_#{v[0][1]? || v[1][0]}",
].uniq
end
def icu_so_symbols_suffix
suffixes = icu_possible_suffixes(icu_version())
handle = LibC.dlopen(SOFILE, LibC::RTLD_LAZY)
abort("cannot load the #{SOFILE} file", 1) if handle.null?
begin
suffixes.each do |suffix|
LibC.dlsym(handle, "#{TESTFUNC}#{suffix}")
return suffix if LibC.dlerror.null?
end
abort("cannot find so symbols suffix", 2)
ensure
LibC.dlclose(handle)
end
end
case ARGV[0]?
when "--version"
puts icu_version()
when "--sem-version"
puts icu_sem_version()
when "--so-symbols-suffix"
puts icu_so_symbols_suffix()
end
require "spec"
require "./icu_info"
describe "icu_version" do
it "returns the version of the ICU lib" do
icu_version().should match(/^[0-9][0-9\.]*$/)
end
end
describe "icu_sem_version" do
it "returns the version of the ICU lib in semantic versioning format" do
icu_sem_version().should match(/^[0-9]+\.[0-9]+\.[0-9]+$/)
end
end
describe "icu_so_symbols_suffix" do
it "returns the version suffix added to symbols in so files of the ICU lib" do
icu_so_symbols_suffix().should match(/^[0-9_]*$/)
end
end
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