From 82185c062c7e037516c9b791a5c8a29a5a55581c Mon Sep 17 00:00:00 2001
From: Felix Palmen <felix@palmen-it.de>
Date: Thu, 25 Jul 2024 15:22:30 +0200
Subject: [PATCH] Config: Runtime configuration for Xmoji

For now, only provide an EmojiHistory instance.
---
 src/bin/xmoji/config.c | 123 +++++++++++++++++++++++++++++++++++++++++
 src/bin/xmoji/config.h |  24 ++++++++
 src/bin/xmoji/xmoji.mk |   1 +
 3 files changed, 148 insertions(+)
 create mode 100644 src/bin/xmoji/config.c
 create mode 100644 src/bin/xmoji/config.h

diff --git a/src/bin/xmoji/config.c b/src/bin/xmoji/config.c
new file mode 100644
index 0000000..6411534
--- /dev/null
+++ b/src/bin/xmoji/config.c
@@ -0,0 +1,123 @@
+#define _POSIX_C_SOURCE 200112L
+
+#include "config.h"
+
+#include "configfile.h"
+#include "emojihistory.h"
+
+#include <poser/core.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define CFGDEFNAME "/xmoji.cfg"
+#define CFGDEFPATH "/.config"
+
+enum ConfigKey
+{
+    CFG_HISTORY
+};
+
+static const char *keys[] = {
+    "history"
+};
+
+struct Config
+{
+    char *cfgfile;
+    ConfigFile *cfg;
+    EmojiHistory *history;
+    int reading;
+};
+
+static void filechanged(void *receiver, void *sender, void *args)
+{
+    (void)sender;
+
+    Config *self = receiver;
+    ConfigFileChangedEventArgs *ea = args;
+
+    self->reading = 1;
+    if (!strcmp(ea->key, keys[CFG_HISTORY]))
+    {
+	EmojiHistory_deserialize(self->history,
+		ConfigFile_get(self->cfg, keys[CFG_HISTORY]));
+    }
+    self->reading = 0;
+}
+
+static void historychanged(void *receiver, void *sender, void *args)
+{
+    (void)sender;
+    (void)args;
+
+    Config *self = receiver;
+    if (self->reading) return;
+    ConfigFile_set(self->cfg, keys[CFG_HISTORY],
+	    EmojiHistory_serialize(self->history));
+    ConfigFile_write(self->cfg);
+}
+
+Config *Config_create(const char *path)
+{
+    Config *self = PSC_malloc(sizeof *self);
+    if (path)
+    {
+	self->cfgfile = PSC_copystr(path);
+    }
+    else
+    {
+	const char *home = getenv("XDG_CONFIG_HOME");
+	if (home)
+	{
+	    size_t homelen = strlen(home);
+	    self->cfgfile = PSC_malloc(homelen + sizeof CFGDEFNAME);
+	    memcpy(self->cfgfile, home, homelen);
+	    memcpy(self->cfgfile+homelen, CFGDEFNAME, sizeof CFGDEFNAME);
+	}
+	else
+	{
+	    home = getenv("HOME");
+	    if (!home)
+	    {
+		struct passwd *pw = getpwuid(getuid());
+		home = pw->pw_dir;
+	    }
+	    size_t homelen = strlen(home);
+	    self->cfgfile = PSC_malloc(homelen + sizeof CFGDEFPATH
+		    + sizeof CFGDEFNAME - 1);
+	    memcpy(self->cfgfile, home, homelen);
+	    memcpy(self->cfgfile+homelen, CFGDEFPATH, sizeof CFGDEFPATH - 1);
+	    memcpy(self->cfgfile+homelen + sizeof CFGDEFPATH - 1,
+		    CFGDEFNAME, sizeof CFGDEFNAME);
+	}
+    }
+    self->cfg = ConfigFile_create(self->cfgfile,
+	    sizeof keys / sizeof *keys, keys);
+    self->history = EmojiHistory_create(HISTSIZE);
+    self->reading = 0;
+    EmojiHistory_deserialize(self->history,
+	    ConfigFile_get(self->cfg, keys[CFG_HISTORY]));
+    ConfigFile_write(self->cfg);
+    PSC_Event_register(ConfigFile_changed(self->cfg), self, filechanged, 0);
+    PSC_Event_register(EmojiHistory_changed(self->history), self,
+	    historychanged, 0);
+    return self;
+}
+
+EmojiHistory *Config_history(Config *self)
+{
+    return self->history;
+}
+
+void Config_destroy(Config *self)
+{
+    if (!self) return;
+    EmojiHistory_destroy(self->history);
+    ConfigFile_destroy(self->cfg);
+    free(self->cfgfile);
+    free(self);
+}
+
diff --git a/src/bin/xmoji/config.h b/src/bin/xmoji/config.h
new file mode 100644
index 0000000..5746117
--- /dev/null
+++ b/src/bin/xmoji/config.h
@@ -0,0 +1,24 @@
+#ifndef XMOJI_CONFIG_H
+#define XMOJI_CONFIG_H
+
+#include <poser/decl.h>
+
+#define HISTSIZE 64
+
+C_CLASS_DECL(Config);
+C_CLASS_DECL(EmojiHistory);
+C_CLASS_DECL(PSC_Event);
+
+typedef struct ConfigChangedEventArgs
+{
+    int external;
+} ConfigChangedEventArgs;
+
+Config *Config_create(const char *path);
+
+EmojiHistory *Config_history(Config *self)
+    CMETHOD;
+
+void Config_destroy(Config *self);
+
+#endif
diff --git a/src/bin/xmoji/xmoji.mk b/src/bin/xmoji/xmoji.mk
index 0a58337..a89d39b 100644
--- a/src/bin/xmoji/xmoji.mk
+++ b/src/bin/xmoji/xmoji.mk
@@ -7,6 +7,7 @@ xmoji_DEFINES=		-DVERSION=\"$(xmoji_VERSION)\"
 xmoji_MODULES=		button \
 			colorset \
 			command \
+			config \
 			configfile \
 			emoji \
 			emojibutton \