lcpex rewrite - alpha

src/misc/helpers.cpp

@@ -0,0 +1,114 @@
+#include "helpers.h"
+
+/**
+ * @brief Determines if a file or directory exists
+ *
+ * This function takes a file or directory name as input and uses the `stat` function to determine if the
+ * specified file or directory exists.
+ *
+ * @param name The name of the file or directory to check
+ *
+ * @return `true` if the file or directory exists, `false` otherwise
+ */
+bool exists(const std::string& name)
+{
+    struct stat buffer;
+    return (stat (name.c_str(), &buffer) == 0);
+}
+
+
+/**
+ * @brief Returns the current working directory as a string
+ *
+ * This function uses the `getcwd` function to obtain the current working directory. If the `getcwd`
+ * function fails, an empty string is returned.
+ *
+ * @return The current working directory as a string
+ */
+std::string get_working_path()
+{
+    char temp[MAXPATHLEN];
+    if (!getcwd(temp, MAXPATHLEN)) {
+        return "";
+    }
+    return temp;
+}
+
+
+/**
+ * @brief Determines if a given file path is a regular file
+ *
+ * This function takes a file path as input and uses the `stat` function to obtain information about the
+ * file or directory. The `st_mode` member of the `stat` structure is then checked to determine if the
+ * file is a regular file or not.
+ *
+ * @param path The file path to be checked
+ *
+ * @return `true` if the file path is a regular file, `false` otherwise
+ */
+bool is_file( std::string path)
+{
+    struct stat buf;
+    stat( path.c_str(), &buf );
+    return S_ISREG(buf.st_mode);
+}
+
+
+/**
+ * @brief Determines if a given file path is a directory
+ *
+ * This function takes a file path as input and uses the `stat` function to obtain information about the
+ * file or directory. The `st_mode` member of the `stat` structure is then checked to determine if the
+ * file is a directory or not.
+ *
+ * @param path The file path to be checked
+ *
+ * @return `true` if the file path is a directory, `false` otherwise
+ */
+bool is_dir( std::string path )
+{
+    struct stat buf;
+    stat( path.c_str(), &buf );
+    return S_ISDIR(buf.st_mode);
+}
+
+
+/**
+ * @brief Returns a string representation of the current date and time in the format "YYYY-MM-DD_HH:MM:SS"
+ *
+ * This function uses the `std::chrono` library to obtain the current system time and convert it to a
+ * time_t value. It then uses the `strftime` function to format the date and time into a string with the
+ * format "YYYY-MM-DD_HH:MM:SS". The resulting string is returned as the function result.
+ *
+ * @return A string representation of the current date and time
+ */
+std::string get_8601()
+{
+    auto now = std::chrono::system_clock::now();
+    auto itt = std::chrono::system_clock::to_time_t(now);
+    char buf[20];
+    strftime(buf, sizeof(buf), "%Y-%m-%d_%H:%M:%S", localtime(&itt));
+    return buf;
+}
+
+
+/**
+ * @brief Interpolates the environment variables in the input text
+ *
+ * This function takes a string reference as input and replaces all occurrences of
+ * environment variables in the format `${VAR_NAME}` with their corresponding values.
+ * If an environment variable is not set, it is replaced with an empty string.
+ *
+ * @param text The input text to be processed
+ */
+void interpolate( std::string & text )
+{
+    static std::regex env( "\\$\\{([^}]+)\\}" );
+    std::smatch match;
+    while ( std::regex_search( text, match, env ) )
+    {
+        const char * s = getenv( match[1].str().c_str() );
+        const std::string var( s == NULL ? "" : s );
+        text.replace( match[0].first, match[0].second, var );
+    }
+}

src/misc/helpers.h

@@ -0,0 +1,54 @@
+/*
+    Rex - A configuration management and workflow automation tool that
+    compiles and runs in minimal environments.
+
+    © SILO GROUP and Chris Punches, 2020.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+*/
+
+#ifndef REX_HELPERS_H
+#define REX_HELPERS_H
+
+#include <string>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <unistd.h>
+#include <chrono>
+#include <sstream>
+#include <syslog.h>
+#include <iostream>
+#include <iomanip>
+#include <sstream>
+#include <vector>
+#include <regex>
+
+
+bool exists (const std::string& name);
+
+std::string get_working_path();
+
+bool is_file( std::string );
+
+bool is_dir( std::string );
+
+// expand environment variables in string
+void interpolate( std::string & text);
+
+std::string get_8601();
+
+const char * command2args( std::string input_string );
+
+#endif //REX_HELPERS_H