From eae18257d78f8ef30618a63e912c64311fb11071 Mon Sep 17 00:00:00 2001
From: Simon From Jakobsen <sfj@skov.dk>
Date: Tue, 16 Jul 2024 10:52:13 +0000
Subject: [PATCH] init

---
 .gitignore       |   3 ++
 CMakeLists.txt   |  16 ++++++
 build_debug.sh   |  10 ++++
 build_release.sh |  16 ++++++
 main.c           | 126 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 171 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CMakeLists.txt
 create mode 100644 build_debug.sh
 create mode 100644 build_release.sh
 create mode 100644 main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..94a9008
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+target/
+build/
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..4c891c0
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,16 @@
+
+cmake_minimum_required(VERSION 3.29)
+
+project(path-shortener VERSION 0.0.0 LANGUAGES C)
+
+add_executable(shortpath main.c)
+
+install(TARGETS shortpath)
+
+set(CPACK_PACKAGE_NAME path-shortener)
+set(CPACK_PACKAGE_VENDOR simon)
+set(CPACK_PACKAGE_DESCRIPTION "CWD path but short")
+set(CPACK_PACKAGE_INSTALL_DIRECTORY ${CPACK_PACKAGE_NAME})
+set(CPACK_VERBATIM_VARIABLES TRUE)
+include(CPack)
+
diff --git a/build_debug.sh b/build_debug.sh
new file mode 100644
index 0000000..0a7a6cd
--- /dev/null
+++ b/build_debug.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -xe
+
+cmake . -B target/debug  -DCMAKE_BUILD_TYPE=Debug
+
+cmake --build target/debug
+
+
+
diff --git a/build_release.sh b/build_release.sh
new file mode 100644
index 0000000..d64c2f0
--- /dev/null
+++ b/build_release.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -xe
+
+cmake . -B target/release  -DCMAKE_BUILD_TYPE=Release
+
+cmake --build target/release
+
+cd target/release
+
+cpack -G "TGZ"
+
+cd ../..
+
+
+
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..8fd75f0
--- /dev/null
+++ b/main.c
@@ -0,0 +1,126 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#define MAX_PATH_SIZE 512
+#define SEGMENT_LENGTH 2
+#define LAST_SEGMENT_MAX_LENGTH 16
+#define MAX_SEGMENTS_AMOUNT 64
+
+typedef struct {
+    size_t seperator;
+    size_t length;
+} Segment;
+
+/// @returns Amount of segments
+size_t get_path_segments(
+        Segment* dest,
+        size_t dest_size,
+        const char* path,
+        size_t path_length)
+{
+    size_t dest_i = 0;
+    size_t i = 0;
+    while (i < path_length) {
+        size_t seperator = i;
+        i += 1;
+        while (path[i] != '\0' && path[i] != '/') {
+            i += 1;
+        }
+        size_t length = i - seperator - 1;
+        dest[dest_i] = (Segment) { seperator, length };
+        dest_i += 1;
+    }
+    return dest_i;
+}
+
+bool in_home_directory(
+        const char* path,
+        const Segment* segments,
+        size_t segments_length,
+        const char* username)
+{
+    if (segments_length < 2)
+        return false;
+    if (strncmp(&path[segments[0].seperator + 1], "home", segments[0].length) != 0) {
+        return false;
+    }
+    if (strncmp(&path[segments[1].seperator + 1], username, strlen(username)) != 0) {
+        return false;
+    }
+    return true;
+}
+
+int main(void)
+{
+    char cwd_path[MAX_PATH_SIZE] = "";
+    if (getcwd(cwd_path, sizeof(cwd_path)) == NULL) {
+        fprintf(stderr, "error: failed to get current working directory: %s\n", strerror(errno));
+        exit(1);
+    }
+    const size_t cwd_path_length = strlen(cwd_path);
+
+    const char* username = getlogin();
+
+    Segment segments[MAX_SEGMENTS_AMOUNT] = { 0 };
+    size_t segments_length = get_path_segments(
+            segments,
+            sizeof(segments) / sizeof(segments[0]),
+            cwd_path,
+            cwd_path_length);
+
+    bool in_home_dir = in_home_directory(cwd_path, segments, segments_length, username);
+
+    char short_path[MAX_PATH_SIZE] = "";
+
+    size_t segments_i = 0;
+    size_t dest_i = 0;
+
+    if (in_home_dir) {
+        short_path[dest_i] = '~';
+        dest_i += 1;
+        segments_i += 2;
+    }
+
+    for (; segments_i <  segments_length - 1; segments_i += 1) {
+        short_path[dest_i] = '/';
+        dest_i += 1;
+        Segment* segment = &segments[segments_i];
+        for (size_t i = 0; i < segment->length && i < SEGMENT_LENGTH; i += 1) {
+            short_path[dest_i] = cwd_path[segment->seperator + 1 + i];
+            dest_i += 1;
+        }
+    }
+
+    if (!(segments_length == 2 && in_home_dir)) {
+        short_path[dest_i] = '/';
+        dest_i += 1;
+        Segment* last = &segments[segments_i];
+        if (last->length >= LAST_SEGMENT_MAX_LENGTH) {
+            for (size_t i = 0; i < 5; i += 1) {
+                short_path[dest_i] = cwd_path[last->seperator + 1 + i];
+                dest_i += 1;
+            }
+            for (size_t i = 0; i < 3; i += 1) {
+                short_path[dest_i] = '.';
+                dest_i += 1;
+            }
+            for (size_t i = 0; i < 8; i += 1) {
+                short_path[dest_i] = cwd_path[last->seperator + 1 + last->length - 8 + i];
+                dest_i += 1;
+            }
+        } else {
+            for (size_t i = 0; i < last->length; i += 1) {
+                short_path[dest_i] = cwd_path[last->seperator + 1 + i];
+                dest_i += 1;
+            }
+        }
+    }
+    short_path[dest_i] = '\0';
+
+    fputs(short_path, stdout);
+}
+