Save options to config file

1 files changed, 258 insertions, 0 deletions

diff --git a/src/config.hpp b/src/config.hpp
new file mode 100644
index 0000000..d30710f
--- /dev/null
+++ b/src/config.hpp
@@ -0,0 +1,258 @@
+#pragma once
+
+#include <string>
+#include <string.h>
+#include <functional>
+#include <unistd.h>
+#include <limits.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <pwd.h>
+#include <sys/stat.h>
+
+struct MainConfig {
+    std::string record_area_option;
+    int fps = 60;
+    std::string audio_input;
+    std::string quality;
+};
+
+struct StreamingConfig {
+    std::string streaming_service;
+    std::string stream_key;
+};
+
+struct RecordConfig {
+    std::string save_directory;
+};
+
+struct ReplayConfig {
+    std::string save_directory;
+    int replay_time = 30;
+};
+
+struct Config {
+    MainConfig main_config;
+    StreamingConfig streaming_config;
+    RecordConfig record_config;
+    ReplayConfig replay_config;
+};
+
+std::string get_home_dir() {
+    const char *home_dir = getenv("HOME");
+    if(!home_dir) {
+        passwd *pw = getpwuid(getuid());
+        home_dir = pw->pw_dir;
+    }
+
+    if(!home_dir) {
+        fprintf(stderr, "Error: Failed to get home directory of user, using /tmp directory\n");
+        home_dir = "/tmp";
+    }
+
+    return home_dir;
+}
+
+static int create_directory_recursive(char *path) {
+    int path_len = strlen(path);
+    char *p = path;
+    char *end = path + path_len;
+    for(;;) {
+        char *slash_p = strchr(p, '/');
+
+        // Skips first '/', we don't want to try and create the root directory
+        if(slash_p == path) {
+            ++p;
+            continue;
+        }
+
+        if(!slash_p)
+            slash_p = end;
+
+        char prev_char = *slash_p;
+        *slash_p = '\0';
+        int err = mkdir(path, S_IRWXU);
+        *slash_p = prev_char;
+
+        if(err == -1 && errno != EEXIST)
+            return err;
+
+        if(slash_p == end)
+            break;
+        else
+            p = slash_p + 1;
+    }
+    return 0;
+}
+
+static bool file_get_content(const char *filepath, std::string &file_content) {
+    file_content.clear();
+    bool success = false;
+
+    FILE *file = fopen(filepath, "rb");
+    if(!file)
+        return success;
+
+    fseek(file, 0, SEEK_END);
+    long file_size = ftell(file);
+    if(file_size != -1) {
+        file_content.resize(file_size);
+        fseek(file, 0, SEEK_SET);
+        if((long)fread(&file_content[0], 1, file_size, file) == file_size)
+            success = true;
+    }
+
+    fclose(file);
+    return success;
+}
+
+struct StringView {
+    const char *str;
+    size_t size;
+
+    bool operator == (const char *other) const {
+        int len = strlen(other);
+        return (size_t)len == size && memcmp(str, other, size) == 0;
+    }
+
+    size_t find(char c) const {
+        const void *p = memchr(str, c, size);
+        if(!p)
+            return std::string::npos;
+        return (const char*)p - str;
+    }
+};
+
+using StringSplitCallback = std::function<bool(StringView line)>;
+
+static void string_split_char(const std::string &str, char delimiter, StringSplitCallback callback_func) {
+    size_t index = 0;
+    while(index < str.size()) {
+        size_t new_index = str.find(delimiter, index);
+        if(new_index == std::string::npos)
+            new_index = str.size();
+
+        if(!callback_func({str.data() + index, new_index - index}))
+            break;
+
+        index = new_index + 1;
+    }
+}
+
+static bool config_split_key_value(const StringView str, StringView &key, StringView &value) {
+    key.str = nullptr;
+    key.size = 0;
+
+    value.str = nullptr;
+    value.size = 0;
+
+    size_t index = str.find(' ');
+    if(index == std::string::npos)
+        return std::string::npos;
+
+    key.str = str.str;
+    key.size = index;
+
+    value.str = str.str + index + 1;
+    value.size = str.size - (index + 1);
+    
+    return true;
+}
+
+static bool string_to_int(std::string str, int &value) {
+    value = 0;
+    errno = 0;
+    char *endptr;
+    value = (int)strtoll(str.c_str(), &endptr, 10);
+    if(endptr == str.c_str() || errno != 0)
+        return false;
+    return true;
+}
+
+static Config read_config() {
+    Config config;
+
+    std::string config_path = get_home_dir();
+    config_path += "/.config/gpu-screen-recorder/config";
+
+    std::string file_content;
+    if(!file_get_content(config_path.c_str(), file_content)) {
+        fprintf(stderr, "Warning: Failed to read config file: %s\n", config_path.c_str());
+        return config;
+    }
+
+    string_split_char(file_content, '\n', [&](StringView line) {
+        StringView key, value;
+        if(!config_split_key_value(line, key, value)) {
+            fprintf(stderr, "Warning: Invalid config option format: %.*s\n", (int)line.size, line.str);
+            return true;
+        }
+
+        if(key == "main.record_area_option") {
+            config.main_config.record_area_option.assign(value.str, value.size);
+        } else if(key == "main.fps") {
+            if(!string_to_int(std::string(value.str, value.size), config.main_config.fps)) {
+                fprintf(stderr, "Warning: Invalid config option main.fps\n");
+                config.main_config.fps = 60;
+            }
+        } else if(key == "main.audio_input") {
+            config.main_config.audio_input.assign(value.str, value.size);
+        } else if(key == "main.quality") {
+            config.main_config.quality.assign(value.str, value.size);
+        } else if(key == "streaming.service") {
+            config.streaming_config.streaming_service.assign(value.str, value.size);
+        } else if(key == "streaming.key") {
+            config.streaming_config.stream_key.assign(value.str, value.size);
+        } else if(key == "record.save_directory") {
+            config.record_config.save_directory.assign(value.str, value.size);
+        } else if(key == "replay.save_directory") {
+            config.replay_config.save_directory.assign(value.str, value.size);
+        } else if(key == "replay.time") {
+            if(!string_to_int(std::string(value.str, value.size), config.replay_config.replay_time)) {
+                fprintf(stderr, "Warning: Invalid config option replay.time\n");
+                config.replay_config.replay_time = 30;
+            }
+        } else {
+            fprintf(stderr, "Warning: Invalid config option: %.*s\n", (int)line.size, line.str);
+        }
+
+        return true;
+    });
+
+    return config;
+}
+
+static void save_config(const Config &config) {
+    std::string config_path = get_home_dir();
+    config_path += "/.config/gpu-screen-recorder/config";
+
+    char dir_tmp[PATH_MAX];
+    strcpy(dir_tmp, config_path.c_str());
+    char *dir = dirname(dir_tmp);
+
+    if(create_directory_recursive(dir) != 0) {
+        fprintf(stderr, "Warning: Failed to create config directory: %s\n", dir);
+        return;
+    }
+
+    FILE *file = fopen(config_path.c_str(), "wb");
+    if(!file) {
+        fprintf(stderr, "Warning: Failed to create config file: %s\n", config_path.c_str());
+        return;
+    }
+
+    fprintf(file, "main.record_area_option %s\n", config.main_config.record_area_option.c_str());
+    fprintf(file, "main.fps %d\n", config.main_config.fps);
+    fprintf(file, "main.audio_input %s\n", config.main_config.audio_input.c_str());
+    fprintf(file, "main.quality %s\n", config.main_config.quality.c_str());
+
+    fprintf(file, "streaming.service %s\n", config.streaming_config.streaming_service.c_str());
+    fprintf(file, "streaming.key %s\n", config.streaming_config.stream_key.c_str());
+
+    fprintf(file, "record.save_directory %s\n", config.record_config.save_directory.c_str());
+
+    fprintf(file, "replay.save_directory %s\n", config.replay_config.save_directory.c_str());
+    fprintf(file, "replay.time %d\n", config.replay_config.replay_time);
+
+    fclose(file);
+}
\ No newline at end of file