Code

Documentation: read-tree --prefix works with existing subtrees
[git.git] / combine-diff.c
index 2183184eed1944c53c3940a3086a7d80d9e4f5b9..b11eb7102c53d3418aa875ee899e61e01de87bca 100644 (file)
@@ -7,6 +7,7 @@
 #include "xdiff-interface.h"
 #include "log-tree.h"
 #include "refs.h"
+#include "userdiff.h"
 
 static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
 {
@@ -92,7 +93,9 @@ struct sline {
        unsigned long *p_lno;
 };
 
-static char *grab_blob(const unsigned char *sha1, unsigned int mode, unsigned long *size)
+static char *grab_blob(const unsigned char *sha1, unsigned int mode,
+                      unsigned long *size, struct userdiff_driver *textconv,
+                      const char *path)
 {
        char *blob;
        enum object_type type;
@@ -105,6 +108,11 @@ static char *grab_blob(const unsigned char *sha1, unsigned int mode, unsigned lo
                /* deleted blob */
                *size = 0;
                return xcalloc(1, 1);
+       } else if (textconv) {
+               struct diff_filespec *df = alloc_filespec(path);
+               fill_filespec(df, sha1, mode);
+               *size = fill_textconv(textconv, df, &blob);
+               free_filespec(df);
        } else {
                blob = read_sha1_file(sha1, &type, size);
                if (type != OBJ_BLOB)
@@ -204,7 +212,9 @@ static void consume_line(void *state_, char *line, unsigned long len)
 static void combine_diff(const unsigned char *parent, unsigned int mode,
                         mmfile_t *result_file,
                         struct sline *sline, unsigned int cnt, int n,
-                        int num_parent, int result_deleted)
+                        int num_parent, int result_deleted,
+                        struct userdiff_driver *textconv,
+                        const char *path)
 {
        unsigned int p_lno, lno;
        unsigned long nmask = (1UL << n);
@@ -217,7 +227,7 @@ static void combine_diff(const unsigned char *parent, unsigned int mode,
        if (result_deleted)
                return; /* result deleted */
 
-       parent_file.ptr = grab_blob(parent, mode, &sz);
+       parent_file.ptr = grab_blob(parent, mode, &sz, textconv, path);
        parent_file.size = sz;
        memset(&xpp, 0, sizeof(xpp));
        xpp.flags = 0;
@@ -685,7 +695,8 @@ static void show_combined_header(struct combine_diff_path *elem,
                                 int num_parent,
                                 int dense,
                                 struct rev_info *rev,
-                                int mode_differs)
+                                int mode_differs,
+                                int show_file_header)
 {
        struct diff_options *opt = &rev->diffopt;
        int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
@@ -739,6 +750,9 @@ static void show_combined_header(struct combine_diff_path *elem,
                printf("%s\n", c_reset);
        }
 
+       if (!show_file_header)
+               return;
+
        if (added)
                dump_quoted_path("--- ", "", "/dev/null",
                                 c_meta, c_reset);
@@ -754,7 +768,8 @@ static void show_combined_header(struct combine_diff_path *elem,
 }
 
 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
-                           int dense, struct rev_info *rev)
+                           int dense, int working_tree_file,
+                           struct rev_info *rev)
 {
        struct diff_options *opt = &rev->diffopt;
        unsigned long result_size, cnt, lno;
@@ -763,14 +778,22 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
        struct sline *sline; /* survived lines */
        int mode_differs = 0;
        int i, show_hunks;
-       int working_tree_file = is_null_sha1(elem->sha1);
        mmfile_t result_file;
+       struct userdiff_driver *userdiff;
+       struct userdiff_driver *textconv = NULL;
+       int is_binary;
 
        context = opt->context;
+       userdiff = userdiff_find_by_path(elem->path);
+       if (!userdiff)
+               userdiff = userdiff_find_by_name("default");
+       if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV))
+               textconv = userdiff_get_textconv(userdiff);
 
        /* Read the result of merge first */
        if (!working_tree_file)
-               result = grab_blob(elem->sha1, elem->mode, &result_size);
+               result = grab_blob(elem->sha1, elem->mode, &result_size,
+                                  textconv, elem->path);
        else {
                /* Used by diff-tree to read from the working tree */
                struct stat st;
@@ -793,9 +816,16 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
                } else if (S_ISDIR(st.st_mode)) {
                        unsigned char sha1[20];
                        if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
-                               result = grab_blob(elem->sha1, elem->mode, &result_size);
+                               result = grab_blob(elem->sha1, elem->mode,
+                                                  &result_size, NULL, NULL);
                        else
-                               result = grab_blob(sha1, elem->mode, &result_size);
+                               result = grab_blob(sha1, elem->mode,
+                                                  &result_size, NULL, NULL);
+               } else if (textconv) {
+                       struct diff_filespec *df = alloc_filespec(elem->path);
+                       fill_filespec(df, null_sha1, st.st_mode);
+                       result_size = fill_textconv(textconv, df, &result);
+                       free_filespec(df);
                } else if (0 <= (fd = open(elem->path, O_RDONLY))) {
                        size_t len = xsize_t(st.st_size);
                        ssize_t done;
@@ -852,6 +882,31 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
                }
        }
 
+       if (textconv)
+               is_binary = 0;
+       else if (userdiff->binary != -1)
+               is_binary = userdiff->binary;
+       else {
+               is_binary = buffer_is_binary(result, result_size);
+               for (i = 0; !is_binary && i < num_parent; i++) {
+                       char *buf;
+                       unsigned long size;
+                       buf = grab_blob(elem->parent[i].sha1,
+                                       elem->parent[i].mode,
+                                       &size, NULL, NULL);
+                       if (buffer_is_binary(buf, size))
+                               is_binary = 1;
+                       free(buf);
+               }
+       }
+       if (is_binary) {
+               show_combined_header(elem, num_parent, dense, rev,
+                                    mode_differs, 0);
+               printf("Binary files differ\n");
+               free(result);
+               return;
+       }
+
        for (cnt = 0, cp = result; cp < result + result_size; cp++) {
                if (*cp == '\n')
                        cnt++;
@@ -899,14 +954,15 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
                        combine_diff(elem->parent[i].sha1,
                                     elem->parent[i].mode,
                                     &result_file, sline,
-                                    cnt, i, num_parent, result_deleted);
+                                    cnt, i, num_parent, result_deleted,
+                                    textconv, elem->path);
        }
 
        show_hunks = make_hunks(sline, cnt, num_parent, dense);
 
        if (show_hunks || mode_differs || working_tree_file) {
                show_combined_header(elem, num_parent, dense, rev,
-                                    mode_differs);
+                                    mode_differs, 1);
                dump_sline(sline, cnt, num_parent,
                           DIFF_OPT_TST(opt, COLOR_DIFF), result_deleted);
        }
@@ -972,6 +1028,12 @@ static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct re
        write_name_quoted(p->path, stdout, line_termination);
 }
 
+/*
+ * The result (p->elem) is from the working tree and their
+ * parents are typically from multiple stages during a merge
+ * (i.e. diff-files) or the state in HEAD and in the index
+ * (i.e. diff-index).
+ */
 void show_combined_diff(struct combine_diff_path *p,
                       int num_parent,
                       int dense,
@@ -985,7 +1047,7 @@ void show_combined_diff(struct combine_diff_path *p,
                                  DIFF_FORMAT_NAME_STATUS))
                show_raw_diff(p, num_parent, rev);
        else if (opt->output_format & DIFF_FORMAT_PATCH)
-               show_patch_diff(p, num_parent, dense, rev);
+               show_patch_diff(p, num_parent, dense, 1, rev);
 }
 
 void diff_tree_combined(const unsigned char *sha1,
@@ -1053,7 +1115,7 @@ void diff_tree_combined(const unsigned char *sha1,
                        for (p = paths; p; p = p->next) {
                                if (p->len)
                                        show_patch_diff(p, num_parent, dense,
-                                                       rev);
+                                                       0, rev);
                        }
                }
        }