rerere.c: use symbolic constants to keep track of parsing states

These hardcoded integers make the code harder to follow than necessary;
replace them with enums to make it easier to read, before adding support
for optionally parsing "diff3 -m" style conflict markers.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/rerere.c b/rerere.c
index 323e493dafee46c0d3f95e3c4cd9c4c9b463bbef..bf74b262f0cc232ba118d34dd7676ce67d3a1d9e 100644 (file)
--- a/rerere.c
+++ b/rerere.c
@@ -75,7 +75,10 @@ static int handle_file(const char *path,
 {
        SHA_CTX ctx;
        char buf[1024];
-       int hunk = 0, hunk_no = 0;
+       int hunk_no = 0;
+       enum {
+               RR_CONTEXT = 0, RR_SIDE_1, RR_SIDE_2,
+       } hunk = RR_CONTEXT;
        struct strbuf one, two;
        FILE *f = fopen(path, "r");
        FILE *out = NULL;
@@ -98,20 +101,20 @@ static int handle_file(const char *path,
        strbuf_init(&two,  0);
        while (fgets(buf, sizeof(buf), f)) {
                if (!prefixcmp(buf, "<<<<<<< ")) {
-                       if (hunk)
+                       if (hunk != RR_CONTEXT)
                                goto bad;
-                       hunk = 1;
+                       hunk = RR_SIDE_1;
                } else if (!prefixcmp(buf, "=======") && isspace(buf[7])) {
-                       if (hunk != 1)
+                       if (hunk != RR_SIDE_1)
                                goto bad;
-                       hunk = 2;
+                       hunk = RR_SIDE_2;
                } else if (!prefixcmp(buf, ">>>>>>> ")) {
-                       if (hunk != 2)
+                       if (hunk != RR_SIDE_2)
                                goto bad;
                        if (strbuf_cmp(&one, &two) > 0)
                                strbuf_swap(&one, &two);
                        hunk_no++;
-                       hunk = 0;
+                       hunk = RR_CONTEXT;
                        if (out) {
                                fputs("<<<<<<<\n", out);
                                fwrite(one.buf, one.len, 1, out);
@@ -127,9 +130,9 @@ static int handle_file(const char *path,
                        }
                        strbuf_reset(&one);
                        strbuf_reset(&two);
-               } else if (hunk == 1)
+               } else if (hunk == RR_SIDE_1)
                        strbuf_addstr(&one, buf);
-               else if (hunk == 2)
+               else if (hunk == RR_SIDE_2)
                        strbuf_addstr(&two, buf);
                else if (out)
                        fputs(buf, out);
@@ -146,7 +149,7 @@ static int handle_file(const char *path,
                fclose(out);
        if (sha1)
                SHA1_Final(sha1, &ctx);
-       if (hunk) {
+       if (hunk != RR_CONTEXT) {
                if (output)
                        unlink(output);
                return error("Could not parse conflict hunks in %s", path);