1 files changed, 106 insertions, 0 deletions
diff --git a/cli_helpers/utils.py b/cli_helpers/utils.py
new file mode 100644
index 0000000..f11fa40
--- /dev/null
+++ b/cli_helpers/utils.py
@@ -0,0 +1,106 @@
+# -*- coding: utf-8 -*-
+"""Various utility functions and helpers."""
+
+import binascii
+import re
+from functools import lru_cache
+from typing import Dict
+
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from pygments.style import StyleMeta
+
+from cli_helpers.compat import binary_type, text_type, Terminal256Formatter, StringIO
+
+
+def bytes_to_string(b):
+    """Convert bytes *b* to a string.
+
+    Hexlify bytes that can't be decoded.
+
+    """
+    if isinstance(b, binary_type):
+        try:
+            return b.decode('utf8')
+        except UnicodeDecodeError:
+            return '0x' + binascii.hexlify(b).decode('ascii')
+    return b
+
+
+def to_string(value):
+    """Convert *value* to a string."""
+    if isinstance(value, binary_type):
+        return bytes_to_string(value)
+    else:
+        return text_type(value)
+
+
+def truncate_string(value, max_width=None, skip_multiline_string=True):
+    """Truncate string values."""
+    if skip_multiline_string and isinstance(value, text_type) and '\n' in value:
+        return value
+    elif isinstance(value, text_type) and max_width is not None and len(value) > max_width:
+        return value[:max_width-3] + "..."
+    return value
+
+
+def intlen(n):
+    """Find the length of the integer part of a number *n*."""
+    pos = n.find('.')
+    return len(n) if pos < 0 else pos
+
+
+def filter_dict_by_key(d, keys):
+    """Filter the dict *d* to remove keys not in *keys*."""
+    return {k: v for k, v in d.items() if k in keys}
+
+
+def unique_items(seq):
+    """Return the unique items from iterable *seq* (in order)."""
+    seen = set()
+    return [x for x in seq if not (x in seen or seen.add(x))]
+
+
+_ansi_re = re.compile('\033\\[((?:\\d|;)*)([a-zA-Z])')
+
+
+def strip_ansi(value):
+    """Strip the ANSI escape sequences from a string."""
+    return _ansi_re.sub('', value)
+
+
+def replace(s, replace):
+    """Replace multiple values in a string"""
+    for r in replace:
+        s = s.replace(*r)
+    return s
+
+
+@lru_cache()
+def _get_formatter(style) -> Terminal256Formatter:
+    return Terminal256Formatter(style=style)
+
+
+def style_field(token, field, style):
+    """Get the styled text for a *field* using *token* type."""
+    formatter = _get_formatter(style)
+    s = StringIO()
+    formatter.format(((token, field),), s)
+    return s.getvalue()
+
+
+def filter_style_table(style: "StyleMeta", *relevant_styles: str) -> Dict:
+    """
+    get a dictionary of styles for given tokens. Typical usage:
+
+    filter_style_table(style, 'Token.Output.EvenRow', 'Token.Output.OddRow') == {
+        'Token.Output.EvenRow': "",
+        'Token.Output.OddRow': "",
+    }
+    """
+    _styles_iter = ((str(key), val) for key, val in getattr(style, 'styles', {}).items())
+    _relevant_styles_iter = filter(
+        lambda tpl: tpl[0] in relevant_styles,
+        _styles_iter
+    )
+    return {key: val for key, val in _relevant_styles_iter}