X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/e1e89091d1de878c98e2d2b0cefd81cc75e7a128..4c480bcac288883040e6fda3c75825a0da54eb66:/black.py

diff --git a/black.py b/black.py
index 7ae2627..e2c427c 100644
--- a/black.py
+++ b/black.py
@@ -55,6 +55,15 @@ class CannotSplit(Exception):
     help='How many character per line to allow.',
     show_default=True,
 )
+@click.option(
+    '--check',
+    is_flag=True,
+    help=(
+        "Don't write back the files, just return the status.  Return code 0 "
+        "means nothing changed.  Return code 1 means some files were "
+        "reformatted.  Return code 123 means there was an internal error."
+    ),
+)
 @click.option(
     '--fast/--safe',
     is_flag=True,
@@ -67,7 +76,9 @@ class CannotSplit(Exception):
     type=click.Path(exists=True, file_okay=True, dir_okay=True, readable=True),
 )
 @click.pass_context
-def main(ctx: click.Context, line_length: int, fast: bool, src: List[str]) -> None:
+def main(
+    ctx: click.Context, line_length: int, check: bool, fast: bool, src: List[str]
+) -> None:
     """The uncompromising code formatter."""
     sources: List[Path] = []
     for s in src:
@@ -85,7 +96,9 @@ def main(ctx: click.Context, line_length: int, fast: bool, src: List[str]) -> No
         p = sources[0]
         report = Report()
         try:
-            changed = format_file_in_place(p, line_length=line_length, fast=fast)
+            changed = format_file_in_place(
+                p, line_length=line_length, fast=fast, write_back=not check
+            )
             report.done(p, changed)
         except Exception as exc:
             report.failed(p, str(exc))
@@ -96,7 +109,9 @@ def main(ctx: click.Context, line_length: int, fast: bool, src: List[str]) -> No
         return_code = 1
         try:
             return_code = loop.run_until_complete(
-                schedule_formatting(sources, line_length, fast, loop, executor)
+                schedule_formatting(
+                    sources, line_length, not check, fast, loop, executor
+                )
             )
         finally:
             loop.close()
@@ -106,13 +121,14 @@ def main(ctx: click.Context, line_length: int, fast: bool, src: List[str]) -> No
 async def schedule_formatting(
     sources: List[Path],
     line_length: int,
+    write_back: bool,
     fast: bool,
     loop: BaseEventLoop,
     executor: Executor,
 ) -> int:
     tasks = {
         src: loop.run_in_executor(
-            executor, format_file_in_place, src, line_length, fast
+            executor, format_file_in_place, src, line_length, fast, write_back
         )
         for src in sources
     }
@@ -135,15 +151,18 @@ async def schedule_formatting(
     return report.return_code
 
 
-def format_file_in_place(src: Path, line_length: int, fast: bool) -> bool:
+def format_file_in_place(
+    src: Path, line_length: int, fast: bool, write_back: bool = False
+) -> bool:
     """Format the file and rewrite if changed. Return True if changed."""
     try:
         contents, encoding = format_file(src, line_length=line_length, fast=fast)
     except NothingChanged:
         return False
 
-    with open(src, "w", encoding=encoding) as f:
-        f.write(contents)
+    if write_back:
+        with open(src, "w", encoding=encoding) as f:
+            f.write(contents)
     return True
 
 
@@ -358,7 +377,7 @@ class BracketTracker:
         """Returns True if there is an yet unmatched open bracket on the line."""
         return bool(self.bracket_match)
 
-    def max_priority(self, exclude: Iterable[LeafID] = ()) -> int:
+    def max_priority(self, exclude: Iterable[LeafID] =()) -> int:
         """Returns the highest priority of a delimiter found on the line.
 
         Values are consistent with what `is_delimiter()` returns.
@@ -781,13 +800,51 @@ def whitespace(leaf: Leaf) -> str:
     if t == STANDALONE_COMMENT:
         return NO
 
+    if t in CLOSING_BRACKETS:
+        return NO
+
     assert p is not None, f"INTERNAL ERROR: hand-made leaf without parent: {leaf!r}"
+    prev = leaf.prev_sibling
+    if not prev:
+        prevp = preceding_leaf(p)
+        if not prevp or prevp.type in OPENING_BRACKETS:
+            return NO
+
+        if prevp.type == token.EQUAL:
+            if prevp.parent and prevp.parent.type in {
+                syms.typedargslist,
+                syms.varargslist,
+                syms.parameters,
+                syms.arglist,
+                syms.argument,
+            }:
+                return NO
+
+        elif prevp.type == token.DOUBLESTAR:
+            if prevp.parent and prevp.parent.type in {
+                syms.typedargslist,
+                syms.varargslist,
+                syms.parameters,
+                syms.arglist,
+                syms.dictsetmaker,
+            }:
+                return NO
+
+        elif prevp.type == token.COLON:
+            if prevp.parent and prevp.parent.type == syms.subscript:
+                return NO
+
+        elif prevp.parent and prevp.parent.type == syms.factor:
+            return NO
+
+    elif prev.type in OPENING_BRACKETS:
+        return NO
+
     if p.type in {syms.parameters, syms.arglist}:
         # untyped function signatures or calls
         if t == token.RPAR:
             return NO
 
-        prev = leaf.prev_sibling
         if not prev or prev.type != token.COMMA:
             return NO
 
@@ -796,13 +853,11 @@ def whitespace(leaf: Leaf) -> str:
         if t == token.RPAR:
             return NO
 
-        prev = leaf.prev_sibling
         if prev and prev.type != token.COMMA:
             return NO
 
     elif p.type == syms.typedargslist:
         # typed function signatures
-        prev = leaf.prev_sibling
         if not prev:
             return NO
 
@@ -820,7 +875,6 @@ def whitespace(leaf: Leaf) -> str:
 
     elif p.type == syms.tname:
         # type names
-        prev = leaf.prev_sibling
         if not prev:
             prevp = preceding_leaf(p)
             if not prevp or prevp.type != token.COMMA:
@@ -831,7 +885,6 @@ def whitespace(leaf: Leaf) -> str:
         if t == token.LPAR or t == token.RPAR:
             return NO
 
-        prev = leaf.prev_sibling
         if not prev:
             if t == token.DOT:
                 prevp = preceding_leaf(p)
@@ -849,7 +902,6 @@ def whitespace(leaf: Leaf) -> str:
         if t == token.EQUAL:
             return NO
 
-        prev = leaf.prev_sibling
         if not prev:
             prevp = preceding_leaf(p)
             if not prevp or prevp.type == token.LPAR:
@@ -863,7 +915,6 @@ def whitespace(leaf: Leaf) -> str:
         return NO
 
     elif p.type == syms.dotted_name:
-        prev = leaf.prev_sibling
         if prev:
             return NO
 
@@ -875,76 +926,16 @@ def whitespace(leaf: Leaf) -> str:
         if t == token.LPAR:
             return NO
 
-        prev = leaf.prev_sibling
         if prev and prev.type == token.LPAR:
             return NO
 
     elif p.type == syms.subscript:
         # indexing
-        if t == token.COLON:
-            return NO
-
-        prev = leaf.prev_sibling
         if not prev or prev.type == token.COLON:
             return NO
 
-    elif p.type in {
-        syms.test,
-        syms.not_test,
-        syms.xor_expr,
-        syms.or_test,
-        syms.and_test,
-        syms.arith_expr,
-        syms.shift_expr,
-        syms.yield_expr,
-        syms.term,
-        syms.power,
-        syms.comparison,
-    }:
-        # various arithmetic and logic expressions
-        prev = leaf.prev_sibling
-        if not prev:
-            prevp = preceding_leaf(p)
-            if not prevp or prevp.type in OPENING_BRACKETS:
-                return NO
-
-            if prevp.type == token.EQUAL:
-                if prevp.parent and prevp.parent.type in {
-                    syms.varargslist, syms.parameters, syms.arglist, syms.argument
-                }:
-                    return NO
-
-        return SPACE
-
     elif p.type == syms.atom:
-        if t in CLOSING_BRACKETS:
-            return NO
-
-        prev = leaf.prev_sibling
-        if not prev:
-            prevp = preceding_leaf(p)
-            if not prevp:
-                return NO
-
-            if prevp.type in OPENING_BRACKETS:
-                return NO
-
-            if prevp.type == token.EQUAL:
-                if prevp.parent and prevp.parent.type in {
-                    syms.varargslist, syms.parameters, syms.arglist, syms.argument
-                }:
-                    return NO
-
-            if prevp.type == token.DOUBLESTAR:
-                if prevp.parent and prevp.parent.type in {
-                    syms.varargslist, syms.parameters, syms.arglist, syms.dictsetmaker
-                }:
-                    return NO
-
-        elif prev.type in OPENING_BRACKETS:
-            return NO
-
-        elif t == token.DOT:
+        if prev and t == token.DOT:
             # dots, but not the first one.
             return NO
 
@@ -954,13 +945,11 @@ def whitespace(leaf: Leaf) -> str:
         p.type == syms.subscriptlist
     ):
         # list interior, including unpacking
-        prev = leaf.prev_sibling
         if not prev:
             return NO
 
     elif p.type == syms.dictsetmaker:
         # dict and set interior, including unpacking
-        prev = leaf.prev_sibling
         if not prev:
             return NO
 
@@ -969,7 +958,6 @@ def whitespace(leaf: Leaf) -> str:
 
     elif p.type == syms.factor or p.type == syms.star_expr:
         # unary ops
-        prev = leaf.prev_sibling
         if not prev:
             prevp = preceding_leaf(p)
             if not prevp or prevp.type in OPENING_BRACKETS:
@@ -990,7 +978,6 @@ def whitespace(leaf: Leaf) -> str:
 
     elif p.type == syms.import_from:
         if t == token.DOT:
-            prev = leaf.prev_sibling
             if prev and prev.type == token.DOT:
                 return NO
 
@@ -998,7 +985,6 @@ def whitespace(leaf: Leaf) -> str:
             if v == 'import':
                 return SPACE
 
-            prev = leaf.prev_sibling
             if prev and prev.type == token.DOT:
                 return NO
 
@@ -1354,7 +1340,15 @@ class Report:
     @property
     def return_code(self) -> int:
         """Which return code should the app use considering the current state."""
-        return 1 if self.failure_count else 0
+        # According to http://tldp.org/LDP/abs/html/exitcodes.html starting with
+        # 126 we have special returncodes reserved by the shell.
+        if self.failure_count:
+            return 123
+
+        elif self.change_count:
+            return 1
+
+        return 0
 
     def __str__(self) -> str:
         """A color report of the current state.