Editor: add new module

Fix #430

src/detection/editor/editor.c

@@ -0,0 +1,112 @@
+#include "editor.h"
+#include "common/processing.h"
+#include "util/stringUtils.h"
+
+#include <stdlib.h>
+
+#if defined(MAXPATH)
+#define FF_EXE_PATH_LEN MAXPATH
+#elif defined(PATH_MAX)
+#define FF_EXE_PATH_LEN PATH_MAX
+#else
+#define FF_EXE_PATH_LEN 260
+#endif
+
+#ifdef _WIN32
+static inline char* realpath(const char* restrict file_name, char* restrict resolved_name)
+{
+    char* result = _fullpath(resolved_name, file_name, _MAX_PATH);
+    if(result)
+    {
+        resolved_name[1] = resolved_name[0]; // Drive Name
+        resolved_name[0] = '/';
+    }
+    return result;
+}
+#endif
+
+const char* ffDetectEditor(FFEditorResult* result)
+{
+    ffStrbufSetS(&result->name, getenv("VISUAL"));
+    if (result->name.length == 0)
+        ffStrbufSetS(&result->name, getenv("EDITOR"));
+    if (result->name.length == 0)
+        return "$VISUAL or $EDITOR not set";
+
+    #ifndef _WIN32
+    if (result->name.chars[0] != '/')
+    {
+        if (ffProcessAppendStdOut(&result->path, (char* const[]){
+            "/usr/bin/which",
+            result->name.chars,
+            NULL,
+        }) != NULL || result->path.length == 0)
+            return NULL;
+    }
+    else
+        ffStrbufSet(&result->path, &result->name);
+
+    char buf[FF_EXE_PATH_LEN];
+    if (!realpath(result->path.chars, buf))
+        return NULL;
+
+    ffStrbufSetS(&result->path, buf);
+    const char* exe = &result->path.chars[ffStrbufLastIndexC(&result->path, '/')];
+    if (!*exe) return NULL;
+    ++exe;
+    result->exe = exe;
+
+    const char* param = NULL;
+    if (
+        ffStrEquals(exe, "nano") ||
+        ffStrEquals(exe, "vim") ||
+        ffStrEquals(exe, "nvim") ||
+        ffStrEquals(exe, "micro") ||
+        ffStrEquals(exe, "emacs") ||
+        ffStrStartsWith(exe, "emacs-") || // emacs-29.3
+        ffStrEquals(exe, "hx") ||
+        ffStrEquals(exe, "code") ||
+        ffStrEquals(exe, "sublime_text")
+    ) param = "--version";
+    else if (
+        ffStrEquals(exe, "kak") ||
+        ffStrEquals(exe, "pico")
+    ) param = "-version";
+    else if (
+        ffStrEquals(exe, "ne")
+    ) param = "-h";
+    else return NULL;
+
+    ffProcessAppendStdOut(&result->version, (char* const[]){
+        result->path.chars,
+        (char*) param,
+        NULL,
+    });
+
+    if (result->version.length == 0)
+        return NULL;
+
+    ffStrbufSubstrBeforeFirstC(&result->version, '\n');
+    for (uint32_t iStart = 0; iStart < result->version.length; ++iStart)
+    {
+        char c = result->version.chars[iStart];
+        if (c >= '0' && c <= '9')
+        {
+            for (uint32_t iEnd = iStart + 1; iEnd < result->version.length; ++iEnd)
+            {
+                char c = result->version.chars[iEnd];
+                if (isspace(c))
+                {
+                    ffStrbufSubstrBefore(&result->version, iEnd);
+                    break;
+                }
+            }
+            if (iStart > 0)
+                ffStrbufSubstrAfter(&result->version, iStart - 1);
+            break;
+        }
+    }
+    #endif
+
+    return NULL;
+}

src/detection/editor/editor.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "fastfetch.h"
+
+typedef struct FFEditorResult
+{
+    FFstrbuf name;
+    const char* exe;
+    FFstrbuf path;
+    FFstrbuf version;
+} FFEditorResult;
+
+const char* ffDetectEditor(FFEditorResult* result);