rerere: prepare for customizable conflict marker length

This still uses the hardcoded conflict marker length of 7 but otherwise
prepares the codepath to deal with customized marker length.

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

diff --git a/rerere.c b/rerere.c
index 5b8ebcb6287b3396d580eb228d4861d667c7ff23..5f332cb25c240d9a26ec48bd3daa36ae1ced9d7c 100644 (file)
--- a/rerere.c
+++ b/rerere.c
@@ -98,6 +98,28 @@ static void rerere_io_putstr(const char *str, struct rerere_io *io)
                ferr_puts(str, io->output, &io->wrerror);
 }
 
+static void rerere_io_putconflict(int ch, int size, struct rerere_io *io)
+{
+       char buf[64];
+
+       while (size) {
+               if (size < sizeof(buf) - 2) {
+                       memset(buf, ch, size);
+                       buf[size] = '\n';
+                       buf[size + 1] = '\0';
+                       size = 0;
+               } else {
+                       int sz = sizeof(buf) - 1;
+                       if (size <= sz)
+                               sz -= (sz - size) + 1;
+                       memset(buf, ch, sz);
+                       buf[sz] = '\0';
+                       size -= sz;
+               }
+               rerere_io_putstr(buf, io);
+       }
+}
+
 static void rerere_io_putmem(const char *mem, size_t sz, struct rerere_io *io)
 {
        if (io->output)
@@ -115,7 +137,17 @@ static int rerere_file_getline(struct strbuf *sb, struct rerere_io *io_)
        return strbuf_getwholeline(sb, io->input, '\n');
 }
 
-static int handle_path(unsigned char *sha1, struct rerere_io *io)
+static int is_cmarker(char *buf, int marker_char, int marker_size, int want_sp)
+{
+       while (marker_size--)
+               if (*buf++ != marker_char)
+                       return 0;
+       if (want_sp && *buf != ' ')
+               return 0;
+       return isspace(*buf);
+}
+
+static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size)
 {
        git_SHA_CTX ctx;
        int hunk_no = 0;
@@ -129,30 +161,30 @@ static int handle_path(unsigned char *sha1, struct rerere_io *io)
                git_SHA1_Init(&ctx);
 
        while (!io->getline(&buf, io)) {
-               if (!prefixcmp(buf.buf, "<<<<<<< ")) {
+               if (is_cmarker(buf.buf, '<', marker_size, 1)) {
                        if (hunk != RR_CONTEXT)
                                goto bad;
                        hunk = RR_SIDE_1;
-               } else if (!prefixcmp(buf.buf, "|||||||") && isspace(buf.buf[7])) {
+               } else if (is_cmarker(buf.buf, '|', marker_size, 0)) {
                        if (hunk != RR_SIDE_1)
                                goto bad;
                        hunk = RR_ORIGINAL;
-               } else if (!prefixcmp(buf.buf, "=======") && isspace(buf.buf[7])) {
+               } else if (is_cmarker(buf.buf, '=', marker_size, 0)) {
                        if (hunk != RR_SIDE_1 && hunk != RR_ORIGINAL)
                                goto bad;
                        hunk = RR_SIDE_2;
-               } else if (!prefixcmp(buf.buf, ">>>>>>> ")) {
+               } else if (is_cmarker(buf.buf, '>', marker_size, 1)) {
                        if (hunk != RR_SIDE_2)
                                goto bad;
                        if (strbuf_cmp(&one, &two) > 0)
                                strbuf_swap(&one, &two);
                        hunk_no++;
                        hunk = RR_CONTEXT;
-                       rerere_io_putstr("<<<<<<<\n", io);
+                       rerere_io_putconflict('<', marker_size, io);
                        rerere_io_putmem(one.buf, one.len, io);
-                       rerere_io_putstr("=======\n", io);
+                       rerere_io_putconflict('=', marker_size, io);
                        rerere_io_putmem(two.buf, two.len, io);
-                       rerere_io_putstr(">>>>>>>\n", io);
+                       rerere_io_putconflict('>', marker_size, io);
                        if (sha1) {
                                git_SHA1_Update(&ctx, one.buf ? one.buf : "",
                                            one.len + 1);
@@ -189,6 +221,7 @@ static int handle_file(const char *path, unsigned char *sha1, const char *output
 {
        int hunk_no = 0;
        struct rerere_io_file io;
+       int marker_size = 7;
 
        memset(&io, 0, sizeof(io));
        io.io.getline = rerere_file_getline;
@@ -205,7 +238,7 @@ static int handle_file(const char *path, unsigned char *sha1, const char *output
                }
        }
 
-       hunk_no = handle_path(sha1, (struct rerere_io *)&io);
+       hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 
        fclose(io.input);
        if (io.io.wrerror)
@@ -255,6 +288,7 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu
        struct cache_entry *ce;
        int pos, len, i, hunk_no;
        struct rerere_io_mem io;
+       int marker_size = 7;
 
        /*
         * Reproduce the conflicted merge in-core
@@ -299,7 +333,7 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu
        strbuf_init(&io.input, 0);
        strbuf_attach(&io.input, result.ptr, result.size, result.size);
 
-       hunk_no = handle_path(sha1, (struct rerere_io *)&io);
+       hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
        strbuf_release(&io.input);
        if (io.io.output)
                fclose(io.io.output);