Merge branch 'tb/precompose-prefix-too'

When commands are started from a subdirectory, they may have to
compare the path to the subdirectory (called prefix and found out
from $(pwd)) with the tracked paths.  On macOS, $(pwd) and
readdir() yield decomposed path, while the tracked paths are
usually normalized to the precomposed form, causing mismatch.  This
has been fixed by taking the same approach used to normalize the
command line arguments.

* tb/precompose-prefix-too:
  MacOS: precompose_argv_prefix()

2 files changed, 34 insertions, 20 deletions

diff --git a/compat/precompose_utf8.c b/compat/precompose_utf8.c
index 136250fbf6..ec560565a8 100644
--- a/compat/precompose_utf8.c
+++ b/compat/precompose_utf8.c
@@ -60,32 +60,46 @@ void probe_utf8_pathname_composition(void)
 	strbuf_release(&path);
 }
 
-
-void precompose_argv(int argc, const char **argv)
+static inline const char *precompose_string_if_needed(const char *in)
 {
-	int i = 0;
-	const char *oldarg;
-	char *newarg;
-	iconv_t ic_precompose;
+	size_t inlen;
+	size_t outlen;
+	if (has_non_ascii(in, (size_t)-1, &inlen)) {
+		iconv_t ic_prec;
+		char *out;
+		if (precomposed_unicode < 0)
+			git_config_get_bool("core.precomposeunicode", &precomposed_unicode);
+		if (precomposed_unicode != 1)
+			return in;
+		ic_prec = iconv_open(repo_encoding, path_encoding);
+		if (ic_prec == (iconv_t) -1)
+			return in;
+
+		out = reencode_string_iconv(in, inlen, ic_prec, 0, &outlen);
+		if (out) {
+			if (outlen == inlen && !memcmp(in, out, outlen))
+				free(out); /* no need to return indentical */
+			else
+				in = out;
+		}
+		iconv_close(ic_prec);
 
-	if (precomposed_unicode != 1)
-		return;
+	}
+	return in;
+}
 
-	ic_precompose = iconv_open(repo_encoding, path_encoding);
-	if (ic_precompose == (iconv_t) -1)
-		return;
+const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix)
+{
+	int i = 0;
 
 	while (i < argc) {
-		size_t namelen;
-		oldarg = argv[i];
-		if (has_non_ascii(oldarg, (size_t)-1, &namelen)) {
-			newarg = reencode_string_iconv(oldarg, namelen, ic_precompose, 0, NULL);
-			if (newarg)
-				argv[i] = newarg;
-		}
+		argv[i] = precompose_string_if_needed(argv[i]);
 		i++;
 	}
-	iconv_close(ic_precompose);
+	if (prefix) {
+		prefix = precompose_string_if_needed(prefix);
+	}
+	return prefix;
 }
 
 
diff --git a/compat/precompose_utf8.h b/compat/precompose_utf8.h
index 6f843d3e1a..d70b84665c 100644
--- a/compat/precompose_utf8.h
+++ b/compat/precompose_utf8.h
@@ -28,7 +28,7 @@ typedef struct {
 	struct dirent_prec_psx *dirent_nfc;
 } PREC_DIR;
 
-void precompose_argv(int argc, const char **argv);
+const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix);
 void probe_utf8_pathname_composition(void);
 
 PREC_DIR *precompose_utf8_opendir(const char *dirname);