feat(ipc). Per hook format (#2810)

* Added format-x support for ipc_module, tested with demo config

* Certain cases not working

* Certain cases not working, build

* Changed label to output tag, Mixing of default formats wont work

* created changelog

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `custom/text`: The `content` setting and all its properties are deprecated in favor of `format` with the same functionality. ([`#2676`](https://github.com/polybar/polybar/pull/2676))
 
 ### Added
+-  Added support for format-i for each hook-i defined in ipc module ([`#2775`](https://github.com/polybar/polybar/issues/2775),  [`#2810`](https://github.com/polybar/polybar/pull/2810))  by [@madhavpcm](https://github.com/madhavpcm).
 - `internal/temperature`: `%temperature-k%` token displays the temperature in kelvin ([`#2774`](https://github.com/polybar/polybar/discussions/2774), [`#2784`](https://github.com/polybar/polybar/pull/2784))
 - `internal/pulseaudio`: `reverse-scroll` option ([`#2664`](https://github.com/polybar/polybar/pull/2664))
 - `custom/script`: Repeat interval for script failure (`interval-fail`) and `exec-if` (`interval-if`) ([`#943`](https://github.com/polybar/polybar/issues/943), [`#2606`](https://github.com/polybar/polybar/issues/2606), [`#2630`](https://github.com/polybar/polybar/pull/2630))

include/modules/ipc.hpp

@@ -29,6 +29,7 @@ namespace modules {
     void start() override;
     void update();
     string get_output();
+    string get_format() const;
     bool build(builder* builder, const string& tag) const;
     void on_message(const string& message);
 

src/modules/ipc.cpp

@@ -59,8 +59,12 @@ namespace modules {
     for (auto& hook : m_hooks) {
       hook->command = pid_token(hook->command);
     }
-
     m_formatter->add(DEFAULT_FORMAT, TAG_OUTPUT, {TAG_OUTPUT});
+
+    for (size_t i = 0; i < m_hooks.size(); i++) {
+      string format_i = "format-" + to_string(i);
+      m_formatter->add_optional(format_i, {TAG_OUTPUT});
+    }
   }
 
   /**
@@ -103,6 +107,17 @@ namespace modules {
     return m_builder->flush();
   }
 
+  string ipc_module::get_format() const {
+    if (m_current_hook != -1 && (size_t)m_current_hook < m_hooks.size()) {
+      string format_i = "format-" + to_string(m_current_hook);
+      if (m_formatter->has_format(format_i)) {
+        return format_i;
+      } else {
+        return DEFAULT_FORMAT;
+      }
+    }
+    return DEFAULT_FORMAT;
+  }
   /**
    * Output content retrieved from hook commands
    */
@@ -150,7 +165,8 @@ namespace modules {
       }
     } catch (const std::invalid_argument& err) {
       m_log.err(
-          "%s: Hook action received '%s' cannot be converted to a valid hook index. Defined hooks goes from 0 to %zu.",
+          "%s: Hook action received '%s' cannot be converted to a valid hook index. Defined hooks goes from 0 to "
+          "%zu.",
           name(), data, m_hooks.size() - 1);
     }
   }