Add --file-name option for stdin EditorConfig resolution

Co-authored-by: Freed-Wu <32936898+Freed-Wu@users.noreply.github.com>

Author: Copilot

shellcheck.1.md

@@ -139,6 +139,12 @@ not warn at all, as `ksh` supports decimals in arithmetic contexts.
     read the list from standard input. This option is processed in addition to
     any files specified on the command line.
 
+**--file-name** *FILE*
+
+:   When checking standard input (`-`), use *FILE* as the filename to resolve
+    `.shellcheckrc` and EditorConfig configuration, instead of `-`. This has no
+    effect when checking regular files.
+
 
 # FORMATS
 

shellcheck.hs

@@ -78,7 +78,8 @@ data Options = Options {
     sourcePaths      :: [FilePath],
     formatterOptions :: FormatterOptions,
     minSeverity      :: Severity,
-    rcfile           :: Maybe FilePath
+    rcfile           :: Maybe FilePath,
+    fileNameOverride :: Maybe FilePath
 }
 
 defaultOptions = Options {
@@ -89,7 +90,8 @@ defaultOptions = Options {
         foColorOption = ColorAuto
     },
     minSeverity = StyleC,
-    rcfile = Nothing
+    rcfile = Nothing,
+    fileNameOverride = Nothing
 }
 
 usageHeader = "Usage: shellcheck [OPTIONS...] FILES..."
@@ -138,7 +140,10 @@ options = [
         (NoArg $ Flag "help" "true") "Show this usage summary and exit",
     Option "" ["files-from"]
         (ReqArg (Flag "files-from") "FILE")
-        "Read input files from FILE (one per line, or '-' for stdin)"
+        "Read input files from FILE (one per line, or '-' for stdin)",
+    Option "" ["file-name"]
+        (ReqArg (Flag "file-name") "FILE")
+        "Use FILE as the filename for parsing EditorConfig configuration when input is stdin"
     ]
 getUsageInfo = usageInfo usageHeader options
 
@@ -421,6 +426,11 @@ parseOption flag options =
                 rcfile = Just str
             }
 
+        Flag "file-name" str -> do
+            return options {
+                fileNameOverride = Just str
+            }
+
         Flag "enable" value ->
             let cs = checkSpec options in return options {
                 checkSpec = cs {
@@ -519,8 +529,12 @@ ioInterface options files = do
     -- merged with any shellcheck.* directives found in applicable
     -- EditorConfig files.
     getConfig cache filename = do
-        rcResult <- getRcConfig cache filename
-        ecResult <- getEditorConfig filename
+        let configFilename =
+                if filename == "-"
+                then fromMaybe filename (fileNameOverride options)
+                else filename
+        rcResult <- getRcConfig cache configFilename
+        ecResult <- getEditorConfig configFilename
         return $ mergeConfigs filename rcResult ecResult
 
     mergeConfigs filename rcResult ecResult =