Windows path manipulation and other cleanups

libmamba/CMakeLists.txt

@@ -120,6 +120,7 @@ set(LIBMAMBA_SOURCES
     ${LIBMAMBA_SOURCE_DIR}/version.cpp
     # C++ utility library
     ${LIBMAMBA_SOURCE_DIR}/util/string.cpp
+    ${LIBMAMBA_SOURCE_DIR}/util/path_manip.cpp
     ${LIBMAMBA_SOURCE_DIR}/util/url_manip.cpp
     ${LIBMAMBA_SOURCE_DIR}/util/url.cpp
     # C++ wrapping of libsolv
@@ -208,6 +209,7 @@ set(LIBMAMBA_PUBLIC_HEADERS
     ${LIBMAMBA_INCLUDE_DIR}/mamba/version.hpp
     # Utility library
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/deprecation.hpp
+    ${LIBMAMBA_INCLUDE_DIR}/mamba/util/build.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/cast.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/compare.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/functional.hpp
@@ -218,6 +220,7 @@ set(LIBMAMBA_PUBLIC_HEADERS
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/graph.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/iterator.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/string.hpp
+    ${LIBMAMBA_INCLUDE_DIR}/mamba/util/path_manip.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/url_manip.hpp
     ${LIBMAMBA_INCLUDE_DIR}/mamba/util/url.hpp
     # Implementation of version and matching specs

libmamba/include/mamba/core/link.hpp

@@ -12,7 +12,7 @@
 #include <tuple>
 #include <vector>
 
-#include "nlohmann/json.hpp"
+#include "mamba/util/build.hpp"
 
 #include "mamba_fs.hpp"
 #include "match_spec.hpp"
@@ -35,7 +35,7 @@ namespace mamba
                                           "(.*))$");  // the rest of the line can contain option
                                                       // flags and end whole_shebang group
 
-    constexpr size_t MAX_SHEBANG_LENGTH = on_linux ? 127 : 512;
+    constexpr std::size_t MAX_SHEBANG_LENGTH = util::on_linux ? 127 : 512;
 
     struct python_entry_point_parsed
     {

libmamba/include/mamba/core/util.hpp

@@ -33,22 +33,6 @@
 
 namespace mamba
 {
-#if __APPLE__ || __MACH__
-    static constexpr bool on_win = false;
-    static constexpr bool on_linux = false;
-    static constexpr bool on_mac = true;
-#elif __linux__
-    static constexpr bool on_win = false;
-    static constexpr bool on_linux = true;
-    static constexpr bool on_mac = false;
-#elif _WIN32
-    static constexpr bool on_win = true;
-    static constexpr bool on_linux = false;
-    static constexpr bool on_mac = false;
-#else
-#error "no supported OS detected"
-#endif
-
     // Used when we want a callback which does nothing.
     struct no_op
     {

libmamba/include/mamba/util/build.hpp

@@ -0,0 +1,28 @@
+// Copyright (c) 2023, QuantStack and Mamba Contributors
+//
+// Distributed under the terms of the BSD 3-Clause License.
+//
+// The full license is in the file LICENSE, distributed with this software.
+
+#ifndef MAMBA_UTIL_BUILD_HPP
+#define MAMBA_UTIL_BUILD_HPP
+
+namespace mamba::util
+{
+#if __APPLE__ || __MACH__
+    inline static constexpr bool on_win = false;
+    inline static constexpr bool on_linux = false;
+    inline static constexpr bool on_mac = true;
+#elif __linux__
+    inline static constexpr bool on_win = false;
+    inline static constexpr bool on_linux = true;
+    inline static constexpr bool on_mac = false;
+#elif _WIN32
+    inline static constexpr bool on_win = true;
+    inline static constexpr bool on_linux = false;
+    inline static constexpr bool on_mac = false;
+#else
+#error "no supported OS detected"
+#endif
+}
+#endif

libmamba/include/mamba/util/path_manip.hpp

@@ -0,0 +1,43 @@
+// Copyright (c) 2023, QuantStack and Mamba Contributors
+//
+// Distributed under the terms of the BSD 3-Clause License.
+//
+// The full license is in the file LICENSE, distributed with this software.
+
+#ifndef MAMBA_UTIL_PATH_MANIP_HPP
+#define MAMBA_UTIL_PATH_MANIP_HPP
+
+#include <string>
+#include <string_view>
+
+namespace mamba::util
+{
+    inline static constexpr char preferred_path_separator_posix = '/';
+    inline static constexpr char preferred_path_separator_win = '\\';
+
+    /**
+     * Return true is the input is explicitly a path.
+     *
+     * Explicit path are:
+     * - Absolute path
+     * - Path starting with '~'
+     * - Relative paths starting with "./" or "../"
+     */
+    [[nodiscard]] auto is_explicit_path(std::string_view input) -> bool;
+
+    /**
+     * Check if a Windows path (not URL) starts with a drive letter.
+     */
+    [[nodiscard]] auto path_has_drive_letter(std::string_view path) -> bool;
+
+    /**
+     * Convert the Windows path separators to Posix ones.
+     */
+    [[nodiscard]] auto path_win_to_posix(std::string path) -> std::string;
+
+    /**
+     * Convert the Windows path separators to Posix ones on Windows only.
+     */
+    [[nodiscard]] auto path_to_posix(std::string path) -> std::string;
+}
+#endif

libmamba/include/mamba/util/url_manip.hpp

@@ -59,11 +59,6 @@ namespace mamba::util
      */
     [[nodiscard]] auto url_has_scheme(std::string_view url) -> bool;
 
-    /**
-     * Check if a Windows path (not URL) starts with a drive letter.
-     */
-    [[nodiscard]] auto path_has_drive_letter(std::string_view path) -> bool;
-
     void split_anaconda_token(const std::string& url, std::string& cleaned_url, std::string& token);
 
     void split_scheme_auth_token(
@@ -76,7 +71,6 @@ namespace mamba::util
 
     bool compare_cleaned_url(const std::string& url1, const std::string& url2);
 
-    bool is_path(const std::string& input);
     std::string path_to_url(const std::string& path);
 
     template <class S, class... Args>

libmamba/src/api/configuration.cpp

@@ -19,6 +19,7 @@
 #include "mamba/core/fsutil.hpp"
 #include "mamba/core/output.hpp"
 #include "mamba/core/package_download.hpp"
+#include "mamba/util/build.hpp"
 #include "mamba/util/string.hpp"
 
 namespace mamba
@@ -1779,7 +1780,7 @@ namespace mamba
         auto& ctx = Context::instance();
 
         std::vector<fs::u8path> system;
-        if constexpr (on_mac || on_linux)
+        if constexpr (util::on_mac || util::on_linux)
         {
             system = { "/etc/conda/.condarc",       "/etc/conda/condarc",
                        "/etc/conda/condarc.d/",     "/etc/conda/.mambarc",

libmamba/src/core/activation.cpp

@@ -10,6 +10,7 @@
 #include "mamba/core/output.hpp"
 #include "mamba/core/shell_init.hpp"
 #include "mamba/core/util.hpp"
+#include "mamba/util/build.hpp"
 #include "mamba/util/string.hpp"
 
 namespace mamba
@@ -207,7 +208,7 @@ namespace mamba
 
     std::vector<fs::u8path> get_path_dirs(const fs::u8path& prefix)
     {
-        if (on_win)
+        if (util::on_win)
         {
             return { prefix,
                      prefix / "Library" / "mingw-w64" / "bin",
@@ -725,7 +726,7 @@ namespace mamba
         std::stringstream out;
         if (!env_transform.export_path.empty())
         {
-            if (on_win)
+            if (util::on_win)
             {
                 out << "export PATH='"
                     << native_path_to_unix(env_transform.export_path, /*is_a_env_path=*/true)
@@ -754,7 +755,7 @@ namespace mamba
 
         for (const auto& [ekey, evar] : env_transform.export_vars)
         {
-            if (on_win && ekey == "PATH")
+            if (util::on_win && ekey == "PATH")
             {
                 out << "export " << ekey << "='"
                     << native_path_to_unix(evar, /*is_a_env_path=*/true) << "'\n";
@@ -844,7 +845,7 @@ namespace mamba
         std::stringstream out;
         if (!env_transform.export_path.empty())
         {
-            if (on_win)
+            if (util::on_win)
             {
                 out << "setenv PATH '"
                     << native_path_to_unix(env_transform.export_path, /*is_a_env_path=*/true)
@@ -873,7 +874,7 @@ namespace mamba
 
         for (const auto& [ekey, evar] : env_transform.export_vars)
         {
-            if (on_win && ekey == "PATH")
+            if (util::on_win && ekey == "PATH")
             {
                 out << "setenv " << ekey << " '"
                     << native_path_to_unix(evar, /*is_a_env_path=*/true) << "';\n";

libmamba/src/core/channel.cpp

@@ -19,6 +19,7 @@
 #include "mamba/core/package_cache.hpp"
 #include "mamba/core/util_os.hpp"
 #include "mamba/core/validate.hpp"
+#include "mamba/util/path_manip.hpp"
 #include "mamba/util/string.hpp"
 #include "mamba/util/url.hpp"
 #include "mamba/util/url_manip.hpp"
@@ -578,10 +579,10 @@ namespace mamba
         std::string value = in_value;
         auto platforms = take_platforms(value);
 
-        auto chan = util::url_has_scheme(value) ? from_url(fix_win_path(value))
-                    : util::is_path(value)      ? from_url(util::path_to_url(value))
-                    : is_package_file(value)    ? from_url(fix_win_path(value))
-                                                : from_name(value);
+        auto chan = util::url_has_scheme(value)     ? from_url(fix_win_path(value))
+                    : util::is_explicit_path(value) ? from_url(util::path_to_url(value))
+                    : is_package_file(value)        ? from_url(fix_win_path(value))
+                                                    : from_name(value);
 
         chan.m_platforms = std::move(platforms);
 

libmamba/src/core/fetch.cpp

@@ -12,6 +12,7 @@
 #include "mamba/core/fetch.hpp"
 #include "mamba/core/output.hpp"
 #include "mamba/core/thread_utils.hpp"
+#include "mamba/util/build.hpp"
 #include "mamba/util/string.hpp"
 #include "mamba/util/url.hpp"
 #include "mamba/util/url_manip.hpp"
@@ -144,7 +145,7 @@ namespace mamba
                 ctx.remote_fetch_params.ssl_verify = std::getenv("REQUESTS_CA_BUNDLE");
                 LOG_INFO << "Using REQUESTS_CA_BUNDLE " << ctx.remote_fetch_params.ssl_verify;
             }
-            else if (ctx.remote_fetch_params.ssl_verify == "<system>" && on_linux)
+            else if (ctx.remote_fetch_params.ssl_verify == "<system>" && util::on_linux)
             {
                 std::array<std::string, 6> cert_locations{
                     "/etc/ssl/certs/ca-certificates.crt",  // Debian/Ubuntu/Gentoo etc.

libmamba/src/core/link.cpp

@@ -21,6 +21,7 @@
 #include "mamba/core/transaction_context.hpp"
 #include "mamba/core/util_os.hpp"
 #include "mamba/core/validate.hpp"
+#include "mamba/util/build.hpp"
 #include "mamba/util/string.hpp"
 
 #if _WIN32
@@ -315,7 +316,7 @@ namespace mamba
     )
     {
         fs::u8path path;
-        if (on_win)
+        if (util::on_win)
         {
             path = prefix / get_bin_directory_short_path()
                    / util::concat(".", pkg_info.name, "-", action, ".bat");
@@ -345,7 +346,7 @@ namespace mamba
         std::vector<std::string> command_args;
         std::unique_ptr<TemporaryFile> script_file;
 
-        if (on_win)
+        if (util::on_win)
         {
             ensure_comspec_set();
             auto comspec = env::get("COMSPEC");
@@ -625,7 +626,7 @@ namespace mamba
                 buffer = read_contents(src, std::ios::in | std::ios::binary);
                 util::replace_all(buffer, path_data.prefix_placeholder, new_prefix);
 
-                if constexpr (!on_win)  // only on non-windows platforms
+                if constexpr (!util::on_win)  // only on non-windows platforms
                 {
                     // we need to check the first line for a shebang and replace it if it's too long
                     if (buffer[0] == '#' && buffer[1] == '!')
@@ -1052,7 +1053,7 @@ namespace mamba
         }
 
         // Create all start menu shortcuts if prefix name doesn't start with underscore
-        if (on_win && Context::instance().shortcuts
+        if (util::on_win && Context::instance().shortcuts
             && m_context->target_prefix.filename().string()[0] != '_')
         {
             for (auto& path : paths_data)

libmamba/src/core/shell_init.cpp

@@ -25,6 +25,7 @@
 #include "mamba/core/shell_init.hpp"
 #include "mamba/core/util.hpp"
 #include "mamba/core/util_os.hpp"
+#include "mamba/util/build.hpp"
 #include "mamba/util/string.hpp"
 
 namespace mamba
@@ -332,7 +333,7 @@ namespace mamba
         std::stringstream content;
         std::string s_mamba_exe;
 
-        if (on_win)
+        if (util::on_win)
         {
             s_mamba_exe = native_path_to_unix(mamba_exe.string());
         }
@@ -364,7 +365,7 @@ namespace mamba
         std::stringstream content;
         std::string s_mamba_exe;
 
-        if (on_win)
+        if (util::on_win)
         {
             s_mamba_exe = native_path_to_unix(mamba_exe.string());
         }
@@ -388,7 +389,7 @@ namespace mamba
         std::stringstream content;
         std::string s_mamba_exe;
 
-        if (on_win)
+        if (util::on_win)
         {
             s_mamba_exe = native_path_to_unix(mamba_exe.string());
         }
@@ -1024,7 +1025,8 @@ namespace mamba
             // initializing conda in .bash_profile.
             // On Windows, there are multiple ways to open bash depending on how it was installed.
             // Git Bash, Cygwin, and MSYS2 all use .bash_profile by default.
-            fs::u8path bashrc_path = (on_mac || on_win) ? home / ".bash_profile" : home / ".bashrc";
+            fs::u8path bashrc_path = (util::on_mac || util::on_win) ? home / ".bash_profile"
+                                                                    : home / ".bashrc";
             modify_rc_file(bashrc_path, conda_prefix, shell, mamba_exe);
         }
         else if (shell == "zsh")
@@ -1092,7 +1094,8 @@ namespace mamba
         fs::u8path home = env::home_directory();
         if (shell == "bash")
         {
-            fs::u8path bashrc_path = (on_mac || on_win) ? home / ".bash_profile" : home / ".bashrc";
+            fs::u8path bashrc_path = (util::on_mac || util::on_win) ? home / ".bash_profile"
+                                                                    : home / ".bashrc";
             reset_rc_file(bashrc_path, shell, mamba_exe);
         }
         else if (shell == "zsh")
@@ -1150,7 +1153,7 @@ namespace mamba
         fs::u8path config_path;
         if (shell == "bash")
         {
-            config_path = (on_mac || on_win) ? home / ".bash_profile" : home / ".bashrc";
+            config_path = (util::on_mac || util::on_win) ? home / ".bash_profile" : home / ".bashrc";
         }
         else if (shell == "zsh")
         {