From fe45744650a5c3b233e137221f6fedb996c4b77b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Marjam=C3=A4ki?= <daniel.marjamaki@gmail.com>
Date: Tue, 9 Apr 2024 10:24:45 +0200
Subject: [PATCH] Fix #12601 (cli: Add --file-filter=- option that reads from
 stdin) (#6258)

---
 cli/cmdlineparser.cpp      | 13 +++++++++++--
 test/redirect.h            | 15 +++++++++++++++
 test/testcmdlineparser.cpp | 32 ++++++++++++++++++++++++--------
 3 files changed, 50 insertions(+), 10 deletions(-)

diff --git a/cli/cmdlineparser.cpp b/cli/cmdlineparser.cpp
index bb3787db0f2..1d5d8eeab5b 100644
--- a/cli/cmdlineparser.cpp
+++ b/cli/cmdlineparser.cpp
@@ -667,8 +667,17 @@ CmdLineParser::Result CmdLineParser::parseFromArgs(int argc, const char* const a
             }
 
             // use a file filter
-            else if (std::strncmp(argv[i], "--file-filter=", 14) == 0)
-                mSettings.fileFilters.emplace_back(argv[i] + 14);
+            else if (std::strncmp(argv[i], "--file-filter=", 14) == 0) {
+                const char *filter = argv[i] + 14;
+                if (std::strcmp(filter, "-") == 0) {
+                    if (!addFilesToList(filter, mSettings.fileFilters)) {
+                        mLogger.printError("Failed: --file-filter=-");
+                        return Result::Fail;
+                    }
+                } else {
+                    mSettings.fileFilters.emplace_back(filter);
+                }
+            }
 
             // file list specified
             else if (std::strncmp(argv[i], "--file-list=", 12) == 0) {
diff --git a/test/redirect.h b/test/redirect.h
index 10e101c6101..0518a3f81a5 100644
--- a/test/redirect.h
+++ b/test/redirect.h
@@ -114,4 +114,19 @@ class SuppressOutput {
 
 #define SUPPRESS SuppressOutput supprout
 
+
+class RedirectInput {
+public:
+    explicit RedirectInput(const std::string &input) : _in(input) {
+        _oldCin = std::cin.rdbuf(); // back up cin's streambuf
+        std::cin.rdbuf(_in.rdbuf()); // assign streambuf to cin
+    }
+    ~RedirectInput() noexcept {
+        std::cin.rdbuf(_oldCin); // restore cin's original streambuf
+    }
+private:
+    std::istringstream _in;
+    std::streambuf* _oldCin;
+};
+
 #endif
diff --git a/test/testcmdlineparser.cpp b/test/testcmdlineparser.cpp
index 22a7627af05..4a42d56bc18 100644
--- a/test/testcmdlineparser.cpp
+++ b/test/testcmdlineparser.cpp
@@ -192,9 +192,10 @@ class TestCmdlineParser : public TestFixture {
         TEST_CASE(exitcodeSuppressionsOld);
         TEST_CASE(exitcodeSuppressions);
         TEST_CASE(exitcodeSuppressionsNoFile);
+        TEST_CASE(fileFilterStdin);
         TEST_CASE(fileList);
         TEST_CASE(fileListNoFile);
-        // TEST_CASE(fileListStdin);  // Disabled since hangs the test run
+        TEST_CASE(fileListStdin);
         TEST_CASE(fileListInvalid);
         TEST_CASE(inlineSuppr);
         TEST_CASE(jobs);
@@ -1083,6 +1084,17 @@ class TestCmdlineParser : public TestFixture {
         ASSERT_EQUALS("cppcheck: error: unrecognized command line option: \"--exitcode-suppressions\".\n", logger->str());
     }
 
+    void fileFilterStdin() {
+        REDIRECT;
+        RedirectInput input("file1.c\nfile2.cpp\n");
+        const char * const argv[] = {"cppcheck", "--file-filter=-"};
+        ASSERT_EQUALS_ENUM(CmdLineParser::Result::Fail, parser->parseFromArgs(2, argv));
+        ASSERT_EQUALS("cppcheck: error: no C or C++ source files found.\n", logger->str());
+        ASSERT_EQUALS(2U, settings->fileFilters.size());
+        ASSERT_EQUALS("file1.c", settings->fileFilters[0]);
+        ASSERT_EQUALS("file2.cpp", settings->fileFilters[1]);
+    }
+
     void fileList() {
         REDIRECT;
         ScopedFile file("files.txt",
@@ -1104,13 +1116,17 @@ class TestCmdlineParser : public TestFixture {
         ASSERT_EQUALS("cppcheck: error: couldn't open the file: \"files.txt\".\n", logger->str());
     }
 
-    /*    void fileListStdin() {
-            // TODO: Give it some stdin to read from, fails because the list of
-            // files in stdin (_pathnames) is empty
-            REDIRECT;
-            const char * const argv[] = {"cppcheck", "--file-list=-", "file.cpp"};
-            TODO_ASSERT_EQUALS(true, false, parser->parseFromArgs(3, argv));
-        } */
+    void fileListStdin() {
+        REDIRECT;
+        RedirectInput input("file1.c\nfile2.cpp\n");
+        const char * const argv[] = {"cppcheck", "--file-list=-", "file.cpp"};
+        ASSERT_EQUALS_ENUM(CmdLineParser::Result::Success, parser->parseFromArgs(3, argv));
+        ASSERT_EQUALS(3, parser->getPathNames().size());
+        auto it = parser->getPathNames().cbegin();
+        ASSERT_EQUALS("file1.c", *it++);
+        ASSERT_EQUALS("file2.cpp", *it++);
+        ASSERT_EQUALS("file.cpp", *it);
+    }
 
     void fileListInvalid() {
         REDIRECT;