Modified snapshot tests to support tab expansion.

This changes how the files are named (to allow for snapshots that aren't
directly related to the --style argument) and fixes the
generate_snapshots.py script to work with the latest version of bat.

Three new tests are also introduced:
- tabs_4 - Tab expansion with a width of 4.
- tabs_8 - Tab expansion with a width of 8.
- tabs_passthrough - No tab expansion.

tests/snapshots/generate_snapshots.py

@@ -10,16 +10,24 @@ def generate_snapshots():
 
     for num in range(len(single_styles)):
         for grouped in itertools.combinations(single_styles, num + 1):
-            generate_snapshot(",".join(grouped))
+            generate_style_snapshot(",".join(grouped))
 
     for style in collective_styles:
-        generate_snapshot(style)
+        generate_style_snapshot(style)
 
-def generate_snapshot(option):
-    command = "../../target/debug/bat --style={0} sample.rs > output/{0}.snapshot.txt".format(
-        option
+    generate_snapshot("tabs_passthrough", "--tabs=0 --style=full")
+    generate_snapshot("tabs_4", "--tabs=4 --style=full")
+    generate_snapshot("tabs_8", "--tabs=8 --style=full")
+
+def generate_style_snapshot(style):
+    generate_snapshot(style.replace(",","_"), "--style={}".format(style))
+
+def generate_snapshot(name, arguments):
+    command = "../../target/debug/bat --decorations=always {1} sample.rs > output/{0}.snapshot.txt".format(
+        name,
+        arguments
     )
-    print("generating snapshot for {}".format(option))
+    print("generating snapshot for {}".format(name))
     subprocess.call(command, shell=True)
 
 def build_bat():

tests/snapshots/sample.modified.rs

@@ -10,7 +10,7 @@ fn main() {
         "The perimeter of the rectangle is {} pixels.",
         perimeter(&rect1)
     );
-    println!(r#"This line contains invalid utf8:  "<22><><EFBFBD><EFBFBD><EFBFBD>"#;
+    println!(r#"This line contains invalid utf8:  "<22><><EFBFBD><EFBFBD><EFBFBD>"#;
 }
 
 fn area(rectangle: &Rectangle) -> u32 {
@@ -20,3 +20,17 @@ fn area(rectangle: &Rectangle) -> u32 {
 fn perimeter(rectangle: &Rectangle) -> u32 {
     (rectangle.width + rectangle.height) * 2
 }
+
+// Tab alignment:
+/*
+	Indent
+	1	2	3	4
+1	?
+22	?
+333	?
+4444	?
+55555	?
+666666	?
+7777777	?
+88888888	?
+*/

tests/snapshots/sample.rs

@@ -16,3 +16,17 @@ fn main() {
 fn area(rectangle: &Rectangle) -> u32 {
     rectangle.width * rectangle.height
 }
+
+// Tab alignment:
+/*
+	Indent
+	1	2	3	4
+1	?
+22	?
+333	?
+4444	?
+55555	?
+666666	?
+7777777	?
+88888888	?
+*/