Allow trimming of whitespace

Signed-off-by: Marcel Müller <neikos@neikos.email>

tests/cases/1-parsed@trim_whitespace.snap

@@ -0,0 +1,34 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+input_file: tests/cases/trim_whitespace.nomo
+---
+ParsedTemplate {
+    tokens: [
+        [LeftDelim]"{{" (0..2),
+        [Whitespace]" " (2..3),
+        [ConditionalIf]"if" (3..5),
+        [Whitespace]" " (5..6),
+        [Ident]"test" (6..10),
+        [Whitespace]" " (10..11),
+        [TrimWhitespace]"-" (11..12),
+        [RightDelim]"}}" (12..14),
+        [Whitespace]"\n    " (14..19),
+        [Content]"Hello" (19..24),
+        [Whitespace]" " (24..25),
+        [LeftDelim]"{{" (25..27),
+        [WantsOutput]"=" (27..28),
+        [Whitespace]" " (28..29),
+        [Ident]"stuff" (29..34),
+        [Whitespace]" " (34..35),
+        [TrimWhitespace]"-" (35..36),
+        [RightDelim]"}}" (36..38),
+        [Whitespace]"\n" (38..39),
+        [LeftDelim]"{{" (39..41),
+        [TrimWhitespace]"-" (41..42),
+        [Whitespace]" " (42..43),
+        [End]"end" (43..46),
+        [Whitespace]" " (46..47),
+        [RightDelim]"}}" (47..49),
+    ],
+}

tests/cases/2-ast@trim_whitespace.snap

@@ -0,0 +1,43 @@
+---
+source: tests/file_tests.rs
+expression: ast
+input_file: tests/cases/trim_whitespace.nomo
+---
+TemplateAst {
+    root: [
+        ConditionalChain {
+            chain: [
+                Block {
+                    prev_whitespace_content: None,
+                    expression: IfConditional {
+                        expression: VariableAccess(
+                            [Ident]"test" (6..10),
+                        ),
+                    },
+                    post_whitespace_content: None,
+                },
+                ConditionalContent {
+                    content: [
+                        StaticContent(
+                            [Content]"Hello" (19..24),
+                        ),
+                        Interpolation {
+                            prev_whitespace_content: Some(
+                                [Whitespace]" " (24..25),
+                            ),
+                            expression: VariableAccess(
+                                [Ident]"stuff" (29..34),
+                            ),
+                            post_whitespace_content: None,
+                        },
+                    ],
+                },
+                Block {
+                    prev_whitespace_content: None,
+                    expression: EndBlock,
+                    post_whitespace_content: None,
+                },
+            ],
+        },
+    ],
+}

tests/cases/3-instructions@trim_whitespace.snap

@@ -0,0 +1,39 @@
+---
+source: tests/file_tests.rs
+expression: emit
+input_file: tests/cases/trim_whitespace.nomo
+---
+[
+    LoadFromContextToSlot {
+        name: "test" (6..10),
+        slot: VariableSlot {
+            index: 0,
+        },
+    },
+    JumpIfNotTrue {
+        emit_slot: VariableSlot {
+            index: 0,
+        },
+        jump: 5,
+    },
+    AppendContent {
+        content: "Hello" (19..24),
+    },
+    AppendContent {
+        content: " " (24..25),
+    },
+    LoadFromContextToSlot {
+        name: "stuff" (29..34),
+        slot: VariableSlot {
+            index: 1,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 1,
+        },
+    },
+    Jump {
+        jump: 0,
+    },
+]

tests/cases/4-output@trim_whitespace.snap

@@ -0,0 +1,6 @@
+---
+source: tests/file_tests.rs
+expression: output
+input_file: tests/cases/trim_whitespace.nomo
+---
+"Hello Hemera"

tests/cases/trim_whitespace.nomo

@@ -0,0 +1,8 @@
+{
+    "test": true,
+    "stuff": "Hemera"
+}
+---
+{{ if test -}}
+    Hello {{= stuff -}}
+{{- end }}