Shell: Correctly keep track of special parameter length

We were previously treating special expansions (e.g. $#) as zero-length
expansions, which made the shell repeat them literally after expanding
them.

1 files changed, 3 insertions, 1 deletions

diff --git a/Userland/Shell/PosixLexer.cpp b/Userland/Shell/PosixLexer.cpp
index a208fcab5d..776856a8a5 100644
--- a/Userland/Shell/PosixLexer.cpp
+++ b/Userland/Shell/PosixLexer.cpp
@@ -751,7 +751,9 @@ Lexer::ReductionResult Lexer::reduce_special_parameter_expansion()
         .parameter = StringBuilder {},
         .range = range(-1),
     };
-    m_state.expansions.last().get<ParameterExpansion>().parameter.append(ch);
+    auto& expansion = m_state.expansions.last().get<ParameterExpansion>();
+    expansion.parameter.append(ch);
+    expansion.range.length = m_state.position.end_offset - expansion.range.start - m_state.position.start_offset;
 
     return {
         .tokens = {},