diff --git a/yamllint/cli.py b/yamllint/cli.py
index 4d94342..4d3a53d 100644
--- a/yamllint/cli.py
+++ b/yamllint/cli.py
@@ -20,13 +20,13 @@ import argparse
 import io
 import locale
 import os
-import platform
 import sys
 
 from yamllint import APP_DESCRIPTION, APP_NAME, APP_VERSION
 from yamllint import linter
 from yamllint.config import YamlLintConfig, YamlLintConfigError
 from yamllint.linter import PROBLEM_LEVELS
+from yamllint.format import show_problems
 
 
 def find_files_recursively(items, conf):
@@ -41,110 +41,6 @@ def find_files_recursively(items, conf):
             yield item
 
 
-def supports_color():
-    supported_platform = not (platform.system() == 'Windows' and not
-                              ('ANSICON' in os.environ or
-                               ('TERM' in os.environ and
-                                os.environ['TERM'] == 'ANSI')))
-    return (supported_platform and
-            hasattr(sys.stdout, 'isatty') and sys.stdout.isatty())
-
-
-class Format(object):
-    @staticmethod
-    def parsable(problem, filename):
-        return ('%(file)s:%(line)s:%(column)s: [%(level)s] %(message)s' %
-                {'file': filename,
-                 'line': problem.line,
-                 'column': problem.column,
-                 'level': problem.level,
-                 'message': problem.message})
-
-    @staticmethod
-    def standard(problem, filename):
-        line = '  %d:%d' % (problem.line, problem.column)
-        line += max(12 - len(line), 0) * ' '
-        line += problem.level
-        line += max(21 - len(line), 0) * ' '
-        line += problem.desc
-        if problem.rule:
-            line += '  (%s)' % problem.rule
-        return line
-
-    @staticmethod
-    def standard_color(problem, filename):
-        line = '  \033[2m%d:%d\033[0m' % (problem.line, problem.column)
-        line += max(20 - len(line), 0) * ' '
-        if problem.level == 'warning':
-            line += '\033[33m%s\033[0m' % problem.level
-        else:
-            line += '\033[31m%s\033[0m' % problem.level
-        line += max(38 - len(line), 0) * ' '
-        line += problem.desc
-        if problem.rule:
-            line += '  \033[2m(%s)\033[0m' % problem.rule
-        return line
-
-    @staticmethod
-    def github(problem, filename):
-        line = '::'
-        line += problem.level
-        line += ' file=' + filename + ','
-        line += 'line=' + format(problem.line) + ','
-        line += 'col=' + format(problem.column)
-        line += '::'
-        line += format(problem.line)
-        line += ':'
-        line += format(problem.column)
-        line += ' '
-        if problem.rule:
-            line += '[' + problem.rule + '] '
-        line += problem.desc
-        return line
-
-
-def show_problems(problems, file, args_format, no_warn):
-    max_level = 0
-    first = True
-
-    if args_format == 'auto':
-        if ('GITHUB_ACTIONS' in os.environ and
-                'GITHUB_WORKFLOW' in os.environ):
-            args_format = 'github'
-        elif supports_color():
-            args_format = 'colored'
-
-    for problem in problems:
-        max_level = max(max_level, PROBLEM_LEVELS[problem.level])
-        if no_warn and (problem.level != 'error'):
-            continue
-        if args_format == 'parsable':
-            print(Format.parsable(problem, file))
-        elif args_format == 'github':
-            if first:
-                print('::group::%s' % file)
-                first = False
-            print(Format.github(problem, file))
-        elif args_format == 'colored':
-            if first:
-                print('\033[4m%s\033[0m' % file)
-                first = False
-            print(Format.standard_color(problem, file))
-        else:
-            if first:
-                print(file)
-                first = False
-            print(Format.standard(problem, file))
-
-    if not first and args_format == 'github':
-        print('::endgroup::')
-
-    if not first and args_format != 'parsable':
-        print('')
-
-    return max_level
-
-
 def run(argv=None):
     parser = argparse.ArgumentParser(prog=APP_NAME,
                                      description=APP_DESCRIPTION)
diff --git a/yamllint/format.py b/yamllint/format.py
new file mode 100644
index 0000000..6df0e6f
--- /dev/null
+++ b/yamllint/format.py
@@ -0,0 +1,111 @@
+
+from __future__ import print_function
+
+import os
+import platform
+import sys
+
+from yamllint.linter import PROBLEM_LEVELS
+
+
+def supports_color():
+    supported_platform = not (platform.system() == 'Windows' and not
+                              ('ANSICON' in os.environ or
+                               ('TERM' in os.environ and
+                                os.environ['TERM'] == 'ANSI')))
+    return (supported_platform and
+            hasattr(sys.stdout, 'isatty') and sys.stdout.isatty())
+
+class Format(object):
+    @staticmethod
+    def parsable(problem, filename):
+        return ('%(file)s:%(line)s:%(column)s: [%(level)s] %(message)s' %
+                {'file': filename,
+                 'line': problem.line,
+                 'column': problem.column,
+                 'level': problem.level,
+                 'message': problem.message})
+
+    @staticmethod
+    def standard(problem, filename):
+        line = '  %d:%d' % (problem.line, problem.column)
+        line += max(12 - len(line), 0) * ' '
+        line += problem.level
+        line += max(21 - len(line), 0) * ' '
+        line += problem.desc
+        if problem.rule:
+            line += '  (%s)' % problem.rule
+        return line
+
+    @staticmethod
+    def standard_color(problem, filename):
+        line = '  \033[2m%d:%d\033[0m' % (problem.line, problem.column)
+        line += max(20 - len(line), 0) * ' '
+        if problem.level == 'warning':
+            line += '\033[33m%s\033[0m' % problem.level
+        else:
+            line += '\033[31m%s\033[0m' % problem.level
+        line += max(38 - len(line), 0) * ' '
+        line += problem.desc
+        if problem.rule:
+            line += '  \033[2m(%s)\033[0m' % problem.rule
+        return line
+
+    @staticmethod
+    def github(problem, filename):
+        line = '::'
+        line += problem.level
+        line += ' file=' + filename + ','
+        line += 'line=' + format(problem.line) + ','
+        line += 'col=' + format(problem.column)
+        line += '::'
+        line += format(problem.line)
+        line += ':'
+        line += format(problem.column)
+        line += ' '
+        if problem.rule:
+            line += '[' + problem.rule + '] '
+        line += problem.desc
+        return line
+
+
+def show_problems(problems, file, args_format, no_warn):
+    max_level = 0
+    first = True
+
+    if args_format == 'auto':
+        if ('GITHUB_ACTIONS' in os.environ and
+                'GITHUB_WORKFLOW' in os.environ):
+            args_format = 'github'
+        elif supports_color():
+            args_format = 'colored'
+
+    for problem in problems:
+        max_level = max(max_level, PROBLEM_LEVELS[problem.level])
+        if no_warn and (problem.level != 'error'):
+            continue
+        if args_format == 'parsable':
+            print(Format.parsable(problem, file))
+        elif args_format == 'github':
+            if first:
+                print('::group::%s' % file)
+                first = False
+            print(Format.github(problem, file))
+        elif args_format == 'colored':
+            if first:
+                print('\033[4m%s\033[0m' % file)
+                first = False
+            print(Format.standard_color(problem, file))
+        else:
+            if first:
+                print(file)
+                first = False
+            print(Format.standard(problem, file))
+
+    if not first and args_format == 'github':
+        print('::endgroup::')
+
+    if not first and args_format != 'parsable':
+        print('')
+
+    return max_level