added stub for ranking implementation

README.md

@@ -1,2 +1,18 @@
 # critical-thinking
 
+On August 25, 2024 I finished reading "The Thinker's Toolkit" by Morgan D. Jones. 
+
+Little did I realize it when I finished the book, but the techniques I learned and practiced while reading the book were so powerful that I ended up using them all the time.
+
+All. The. Time.
+
+Critical thinking and problem solving is a **very powerful** skill. Unfortunately, it is not taught to us.
+
+If you want to use some of the tools he taught us about, you can use my software to make it easier to understand and use. Especially laborious processes like ranking.
+
+My code is public domain, licensed under the [0BSD](https://spdx.org/licenses/0BSD.html) license.
+
+Book copyright (c) 1995, 1998 Morgan Jones
+
+## Install
+tbd

color.h

@@ -0,0 +1,22 @@
+#ifndef COLOR_H
+#define COLOR_H
+
+#define RESET   "\033[0m"
+#define BLACK   "\033[30m"      /* Black */
+#define RED     "\033[31m"      /* Red */
+#define GREEN   "\033[32m"      /* Green */
+#define YELLOW  "\033[33m"      /* Yellow */
+#define BLUE    "\033[34m"      /* Blue */
+#define MAGENTA "\033[35m"      /* Magenta */
+#define CYAN    "\033[36m"      /* Cyan */
+#define WHITE   "\033[37m"      /* White */
+#define BOLDBLACK   "\033[1m\033[30m"      /* Bold Black */
+#define BOLDRED     "\033[1m\033[31m"      /* Bold Red */
+#define BOLDGREEN   "\033[1m\033[32m"      /* Bold Green */
+#define BOLDYELLOW  "\033[1m\033[33m"      /* Bold Yellow */
+#define BOLDBLUE    "\033[1m\033[34m"      /* Bold Blue */
+#define BOLDMAGENTA "\033[1m\033[35m"      /* Bold Magenta */
+#define BOLDCYAN    "\033[1m\033[36m"      /* Bold Cyan */
+#define BOLDWHITE   "\033[1m\033[37m"      /* Bold White */
+
+#endif

rank.c

@@ -0,0 +1,78 @@
+/*
+ * Ranking tool in "The Thinker's Toolkit" by Morgan Jones
+ * Book copyright (c) 1995, 1998 Morgan Jones
+ * This file is public domain.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "color.h"
+
+#define M_STR 255
+
+int
+main(void)
+{
+    // maximum M_STR strings, 255 bytes each
+    char strings[M_STR][255] = { 0 };
+
+    // read strings
+    printf(BOLDWHITE "Enter strings: (empty line when done) \n" RESET);
+
+    int i;
+    for (i = 0; i < M_STR; i++) {
+        fgets(strings[i], 255, stdin);
+        // if its an empty string, stop reading
+        if (strings[i][0] == '\n') {
+            strings[i][0] = '\0';
+            break;
+        } 
+
+        // remove newline
+        strings[i][strcspn(strings[i], "\n")] = '\0';
+    }
+
+    // construct matrix of comparisons
+    // NOTE: it doesn't actually store the "reason",
+    // it just forces the user to type something out lol
+    char matrix[i][i];
+
+    // memcpy(3) with null bytes
+    memset(matrix, 0, sizeof(matrix));
+
+    // store the winners
+    int winners[i];
+
+    printf("%d: %d\n", i, sizeof(winners));
+
+    // memcpy(3) with null bytes
+    memset(winners, 0, sizeof(winners));
+
+    // compare all of the elements
+    for (int j = 0; j < i; j++) {
+        for (int k = j + 1; k < i; k++) {
+            printf("%s vs %s (>/<): ", strings[j], strings[k]);
+            // read one char, set matrix accordingly
+            char c = getchar();
+            if (c == '>') {
+                matrix[j][k] = 1;
+                winners[j]++;
+            } else if (c == '<') {
+                matrix[j][k] = 0;
+                winners[k]++;
+            } else {
+                printf("Setting to " BOLDRED "<" RESET ": %c\n", c);
+                matrix[j][k] = 0;
+            } 
+
+        }
+    }
+
+    // print out the results
+    for (int j = 0; j < i; j++) {
+        printf("%s: %d\n", strings[j], winners[j]);
+    }
+
+    return 0;
+}