lint: remove or comment out unused functions

Cppcheck has identified a lot of unused functions. This removes funcs that
are unlikely to ever be used. Others that might be useful for debugging I've
commented out with "#if 0".

src/builtin.cpp

@@ -3925,6 +3925,8 @@ static int builtin_history(parser_t &parser, io_streams_t &streams, wchar_t **ar
     return STATUS_BUILTIN_ERROR;
 }
 
+#if 0
+// Disabled for the 2.2.0 release: https://github.com/fish-shell/fish-shell/issues/1809.
 int builtin_parse(parser_t &parser, io_streams_t &streams, wchar_t **argv)
 {
     struct sigaction act;
@@ -3966,6 +3968,7 @@ int builtin_parse(parser_t &parser, io_streams_t &streams, wchar_t **argv)
     }
     return STATUS_BUILTIN_OK;
 }
+#endif
 
 int builtin_true(parser_t &parser, io_streams_t &streams, wchar_t **argv)
 {
@@ -3992,6 +3995,7 @@ static const builtin_data_t builtin_datas[]=
 {
     { 		L"[",  &builtin_test, N_(L"Test a condition")   },
 #if 0
+    // Disabled for the 2.2.0 release: https://github.com/fish-shell/fish-shell/issues/1809.
     { 		L"__fish_parse",  &builtin_parse, N_(L"Try out the new parser")  },
 #endif
     { 		L"and",  &builtin_generic, N_(L"Execute command if previous command suceeded")  },

src/common.cpp

@@ -689,11 +689,6 @@ void debug(int level, const char *msg, ...)
     errno = errno_old;
 }
 
-void print_stderr(const wcstring &str)
-{
-    fprintf(stderr, "%ls\n", str.c_str());
-}
-
 void read_ignore(int fd, void *buff, size_t count)
 {
     size_t ignore __attribute__((unused));

src/common.h

@@ -811,9 +811,6 @@ ssize_t read_loop(int fd, void *buff, size_t count);
 void debug(int level, const char *msg, ...);
 void debug(int level, const wchar_t *msg, ...);
 
-/** Writes a string to stderr, followed by a newline */
-void print_stderr(const wcstring &str);
-
 /**
    Replace special characters with backslash escape sequences. Newline is
    replaced with \n, etc.

src/expand.cpp

@@ -1998,62 +1998,6 @@ bool fish_xdm_login_hack_hack_hack_hack(std::vector<std::string> *cmds, int argc
     return result;
 }
 
-bool fish_openSUSE_dbus_hack_hack_hack_hack(std::vector<completion_t> *args)
-{
-    static signed char isSUSE = -1;
-    if (isSUSE == 0)
-        return false;
-
-    bool result = false;
-    if (args && ! args->empty())
-    {
-        const wcstring &cmd = args->at(0).completion;
-        if (cmd.find(L"DBUS_SESSION_BUS_") != wcstring::npos)
-        {
-            /* See if we are SUSE */
-            if (isSUSE < 0)
-            {
-                struct stat buf = {};
-                isSUSE = (0 == stat("/etc/SuSE-release", &buf));
-            }
-
-            if (isSUSE)
-            {
-                /* Look for an equal sign */
-                size_t where = cmd.find(L'=');
-                if (where != wcstring::npos)
-                {
-                    /* Oh my. It's presumably of the form foo=bar; find the = and split */
-                    const wcstring key = wcstring(cmd, 0, where);
-
-                    /* Trim whitespace and semicolon */
-                    wcstring val = wcstring(cmd, where+1);
-                    size_t last_good = val.find_last_not_of(L"\n ;");
-                    if (last_good != wcstring::npos)
-                        val.resize(last_good + 1);
-
-                    args->clear();
-                    append_completion(args, L"set");
-                    if (key == L"DBUS_SESSION_BUS_ADDRESS")
-                        append_completion(args, L"-x");
-                    append_completion(args, key);
-                    append_completion(args, val);
-                    result = true;
-                }
-                else if (string_prefixes_string(L"export DBUS_SESSION_BUS_ADDRESS;", cmd))
-                {
-                    /* Nothing, we already exported it */
-                    args->clear();
-                    append_completion(args, L"echo");
-                    append_completion(args, L"-n");
-                    result = true;
-                }
-            }
-        }
-    }
-    return result;
-}
-
 bool expand_abbreviation(const wcstring &src, wcstring *output)
 {
     if (src.empty())

src/expand.h

@@ -168,7 +168,6 @@ bool expand_abbreviation(const wcstring &src, wcstring *output);
 
 /* Terrible hacks */
 bool fish_xdm_login_hack_hack_hack_hack(std::vector<std::string> *cmds, int argc, const char * const *argv);
-bool fish_openSUSE_dbus_hack_hack_hack_hack(std::vector<completion_t> *args);
 
 
 #endif

src/fish_tests.cpp

@@ -2887,8 +2887,7 @@ public:
     static void test_history(void);
     static void test_history_merge(void);
     static void test_history_formats(void);
-    static void test_history_speed(void);
-
+    // static void test_history_speed(void);
     static void test_history_races(void);
     static void test_history_races_pound_on_history();
 };
@@ -3378,6 +3377,8 @@ void history_tests_t::test_history_formats(void)
     }
 }
 
+#if 0
+// This test isn't run at this time. It was added by commit b9283d48 but not actually enabled.
 void history_tests_t::test_history_speed(void)
 {
     say(L"Testing history speed (pid is %d)", getpid());
@@ -3403,6 +3404,7 @@ void history_tests_t::test_history_speed(void)
     hist->clear();
     delete hist;
 }
+#endif
 
 static void test_new_parser_correctness(void)
 {
@@ -4483,8 +4485,8 @@ int main(int argc, char **argv)
     if (should_test_function("history_merge")) history_tests_t::test_history_merge();
     if (should_test_function("history_races")) history_tests_t::test_history_races();
     if (should_test_function("history_formats")) history_tests_t::test_history_formats();
-    //history_tests_t::test_history_speed();
     if (should_test_function("string")) test_string();
+    // history_tests_t::test_history_speed();
 
     say(L"Encountered %d errors in low-level tests", err_count);
     if (s_test_run_count == 0)

src/io.cpp

@@ -183,6 +183,9 @@ void io_chain_t::append(const io_chain_t &chain)
     this->insert(this->end(), chain.begin(), chain.end());
 }
 
+#if 0
+// This isn't used so the lint tools were complaining about its presence. I'm keeping it in the
+// source because it could be useful for debugging.
 void io_print(const io_chain_t &chain)
 {
     if (chain.empty())
@@ -206,6 +209,7 @@ void io_print(const io_chain_t &chain)
         }
     }
 }
+#endif
 
 /* If the given fd is used by the io chain, duplicates it repeatedly until an fd not used in the io chain is found, or we run out. If we return a new fd or an error, closes the old one. Any fd created is marked close-on-exec. Returns -1 on failure (in which case the given fd is still closed). */
 static int move_fd_to_unused(int fd, const io_chain_t &io_chain)

src/io.h

@@ -304,7 +304,9 @@ struct io_streams_t
     }
 };
 
-/** Print debug information about the specified IO redirection chain to stderr. */
+#if 0
+// Print debug information about the specified IO redirection chain to stderr.
 void io_print(const io_chain_t &chain);
+#endif
 
 #endif

src/parser.cpp

@@ -842,8 +842,6 @@ int parser_t::eval_acquiring_tree(const wcstring &cmd, const io_chain_t &io, enu
         return 0;
     }
 
-    //print_stderr(block_stack_description());
-    
     /* Determine the initial eval level. If this is the first context, it's -1; otherwise it's the eval level of the top context. This is sort of wonky because we're stitching together a global notion of eval level from these separate objects. A better approach would be some profile object that all contexts share, and that tracks the eval levels on its own. */
     int exec_eval_level = (execution_contexts.empty() ? -1 : execution_contexts.back()->current_eval_level());
     

src/proc.cpp

@@ -94,15 +94,21 @@ size_t job_iterator_t::count() const
     return this->job_list->size();
 }
 
+#if 0
+// This isn't used so the lint tools were complaining about its presence. I'm keeping it in the
+// source because it could be useful for debugging. However, it would probably be better to add a
+// verbose or debug option to the builtin `jobs` command.
 void print_jobs(void)
 {
     job_iterator_t jobs;
     job_t *j;
-    while ((j = jobs.next()))
-    {
-        printf("%p -> %ls -> (foreground %d, complete %d, stopped %d, constructed %d)\n", j, j->command_wcstr(), job_get_flag(j, JOB_FOREGROUND), job_is_completed(j), job_is_stopped(j), job_get_flag(j, JOB_CONSTRUCTED));
+    while (j = jobs.next()) {
+        printf("%p -> %ls -> (foreground %d, complete %d, stopped %d, constructed %d)\n",
+                j, j->command_wcstr(), job_get_flag(j, JOB_FOREGROUND), job_is_completed(j),
+                job_is_stopped(j), job_get_flag(j, JOB_CONSTRUCTED));
     }
 }
+#endif
 
 int is_interactive_session=0;
 int is_subshell=0;