workspacerules: Add new optional "default command" for auto-launching apps on new workspaces (#3559)

src/Compositor.cpp

@@ -1194,25 +1194,34 @@ void CCompositor::sanityCheckWorkspaces() {
             continue;
         }
 
-        const auto WINDOWSONWORKSPACE = getWindowsOnWorkspace((*it)->m_iID);
+        const auto& WORKSPACE          = *it;
+        const auto  WINDOWSONWORKSPACE = getWindowsOnWorkspace(WORKSPACE->m_iID);
 
-        if ((WINDOWSONWORKSPACE == 0 && !isWorkspaceVisible((*it)->m_iID))) {
+        if (WINDOWSONWORKSPACE == 0) {
+            if (!isWorkspaceVisible(WORKSPACE->m_iID)) {
 
-            if ((*it)->m_bIsSpecialWorkspace) {
-                if ((*it)->m_fAlpha.fl() > 0.f /* don't abruptly end the fadeout */) {
+                if (WORKSPACE->m_bIsSpecialWorkspace) {
+                    if (WORKSPACE->m_fAlpha.fl() > 0.f /* don't abruptly end the fadeout */) {
                         ++it;
                         continue;
                     }
 
-                const auto PMONITOR = getMonitorFromID((*it)->m_iMonitorID);
+                    const auto PMONITOR = getMonitorFromID(WORKSPACE->m_iMonitorID);
 
-                if (PMONITOR && PMONITOR->specialWorkspaceID == (*it)->m_iID)
+                    if (PMONITOR && PMONITOR->specialWorkspaceID == WORKSPACE->m_iID)
                         PMONITOR->setSpecialWorkspace(nullptr);
                 }
 
                 it = m_vWorkspaces.erase(it);
                 continue;
             }
+            if (!WORKSPACE->m_bOnCreatedEmptyExecuted) {
+                if (auto cmd = WORKSPACERULE.onCreatedEmptyRunCmd)
+                    g_pKeybindManager->spawn(*cmd);
+
+                WORKSPACE->m_bOnCreatedEmptyExecuted = true;
+            }
+        }
 
         ++it;
     }

src/config/ConfigManager.cpp

@@ -2,6 +2,7 @@
 #include "../managers/KeybindManager.hpp"
 
 #include <string.h>
+#include <string>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -1176,6 +1177,9 @@ void CConfigManager::handleWorkspaceRules(const std::string& command, const std:
         rules                  = value.substr(WORKSPACE_DELIM + 1);
     }
 
+    const static std::string ruleOnCreatedEmtpy    = "on-created-empty:";
+    const static int         ruleOnCreatedEmtpyLen = ruleOnCreatedEmtpy.length();
+
     auto                     assignRule = [&](std::string rule) {
         size_t delim = std::string::npos;
         if ((delim = rule.find("gapsin:")) != std::string::npos)
@@ -1198,6 +1202,8 @@ void CConfigManager::handleWorkspaceRules(const std::string& command, const std:
             wsRule.isDefault = configStringToInt(rule.substr(delim + 8));
         else if ((delim = rule.find("persistent:")) != std::string::npos)
             wsRule.isPersistent = configStringToInt(rule.substr(delim + 11));
+        else if ((delim = rule.find(ruleOnCreatedEmtpy)) != std::string::npos)
+            wsRule.onCreatedEmptyRunCmd = cleanCmdForWorkspace(name, rule.substr(delim + ruleOnCreatedEmtpyLen));
     };
 
     size_t      pos = 0;

src/config/ConfigManager.hpp

@@ -49,6 +49,7 @@ struct SWorkspaceRule {
     std::optional<int>         rounding;
     std::optional<int>         decorate;
     std::optional<int>         shadow;
+    std::optional<std::string> onCreatedEmptyRunCmd;
 };
 
 struct SMonitorAdditionalReservedArea {

src/helpers/MiscFunctions.cpp

@@ -2,6 +2,7 @@
 #include "../defines.hpp"
 #include <algorithm>
 #include "../Compositor.hpp"
+#include <optional>
 #include <set>
 #include <sys/utsname.h>
 #include <iomanip>
@@ -503,6 +504,43 @@ int getWorkspaceIDFromString(const std::string& in, std::string& outName) {
     return result;
 }
 
+std::optional<std::string> cleanCmdForWorkspace(const std::string& inWorkspaceName, std::string dirtyCmd) {
+
+    std::string cmd = removeBeginEndSpacesTabs(dirtyCmd);
+
+    if (!cmd.empty()) {
+        std::string       rules;
+        const std::string workspaceRule = "workspace " + inWorkspaceName;
+
+        if (cmd[0] == '[') {
+            const int closingBracketIdx = cmd.find_last_of(']');
+            auto      tmpRules          = cmd.substr(1, closingBracketIdx - 1);
+            cmd                         = cmd.substr(closingBracketIdx + 1);
+
+            auto rulesList = CVarList(tmpRules, 0, ';');
+
+            bool hadWorkspaceRule = false;
+            rulesList.map([&](std::string& rule) {
+                if (rule.find("workspace") == 0) {
+                    rule             = workspaceRule;
+                    hadWorkspaceRule = true;
+                }
+            });
+
+            if (!hadWorkspaceRule)
+                rulesList.append(workspaceRule);
+
+            rules = "[" + rulesList.join(";") + "]";
+        } else {
+            rules = "[" + workspaceRule + "]";
+        }
+
+        return std::optional<std::string>(rules + " " + cmd);
+    }
+
+    return std::nullopt;
+}
+
 float vecToRectDistanceSquared(const Vector2D& vec, const Vector2D& p1, const Vector2D& p2) {
     const float DX = std::max({0.0, p1.x - vec.x, vec.x - p2.x});
     const float DY = std::max({0.0, p1.y - vec.y, vec.y - p2.y});

src/helpers/MiscFunctions.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <optional>
 #include <string>
 #include <wayland-server.h>
 #include <wlr/util/box.h>
@@ -20,6 +21,7 @@ std::string                      removeBeginEndSpacesTabs(std::string);
 bool                             isNumber(const std::string&, bool allowfloat = false);
 bool                             isDirection(const std::string&);
 int                              getWorkspaceIDFromString(const std::string&, std::string&);
+std::optional<std::string>       cleanCmdForWorkspace(const std::string&, std::string);
 float                            vecToRectDistanceSquared(const Vector2D& vec, const Vector2D& p1, const Vector2D& p2);
 void                             logSystemInfo();
 std::string                      execAndGet(const char*);

src/helpers/VarList.hpp

@@ -1,4 +1,5 @@
 #pragma once
+#include <functional>
 #include <vector>
 #include <string>
 #include "../macros.hpp"
@@ -20,6 +21,15 @@ class CVarList {
 
     std::string join(const std::string& joiner, size_t from = 0, size_t to = 0) const;
 
+    void        map(std::function<void(std::string&)> func) {
+        for (auto& s : m_vArgs)
+            func(s);
+    }
+
+    void append(const std::string arg) {
+        m_vArgs.emplace_back(arg);
+    }
+
     std::string operator[](const size_t& idx) const {
         if (idx >= m_vArgs.size())
             return "";

src/helpers/Workspace.hpp

@@ -4,8 +4,7 @@
 #include <string>
 #include "../defines.hpp"
 
-enum eFullscreenMode : int8_t
-{
+enum eFullscreenMode : int8_t {
     FULLSCREEN_INVALID = -1,
     FULLSCREEN_FULL    = 0,
     FULLSCREEN_MAXIMIZED
@@ -53,6 +52,9 @@ class CWorkspace {
     // last monitor (used on reconnect)
     std::string m_szLastMonitor = "";
 
+    // Whether the user configured command for on-created-empty has been executed, if any
+    bool        m_bOnCreatedEmptyExecuted = false;
+
     void        startAnim(bool in, bool left, bool instant = false);
     void        setActive(bool on);
 

src/managers/KeybindManager.cpp

@@ -1,5 +1,7 @@
 #include "KeybindManager.hpp"
 #include "../render/decorations/CHyprGroupBarDecoration.hpp"
+#include "debug/Log.hpp"
+#include "helpers/VarList.hpp"
 
 #include <regex>