pretty: add pp_commit_easy function for simple callers

diff --git a/pretty.c b/pretty.c
index 85499347514ec3e1d62d6caa9f53b886c556e345..75a9a416a4b1bc59725ff6cf93d5ec9baad9ede0 100644 (file)
--- a/pretty.c
+++ b/pretty.c
@@ -216,36 +216,53 @@ static int is_rfc2047_special(char ch)
 static void add_rfc2047(struct strbuf *sb, const char *line, int len,
                       const char *encoding)
 {
-       int i, last;
+       static const int max_length = 78; /* per rfc2822 */
+       int i;
+       int line_len;
+
+       /* How many bytes are already used on the current line? */
+       for (i = sb->len - 1; i >= 0; i--)
+               if (sb->buf[i] == '\n')
+                       break;
+       line_len = sb->len - (i+1);
 
        for (i = 0; i < len; i++) {
                int ch = line[i];
-               if (non_ascii(ch))
+               if (non_ascii(ch) || ch == '\n')
                        goto needquote;
                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
                        goto needquote;
        }
-       strbuf_add(sb, line, len);
+       strbuf_add_wrapped_bytes(sb, line, len, 0, 1, max_length - line_len);
        return;
 
 needquote:
        strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
        strbuf_addf(sb, "=?%s?q?", encoding);
-       for (i = last = 0; i < len; i++) {
+       line_len += strlen(encoding) + 5; /* 5 for =??q? */
+       for (i = 0; i < len; i++) {
                unsigned ch = line[i] & 0xFF;
+
+               if (line_len >= max_length - 2) {
+                       strbuf_addf(sb, "?=\n =?%s?q?", encoding);
+                       line_len = strlen(encoding) + 5 + 1; /* =??q? plus SP */
+               }
+
                /*
                 * We encode ' ' using '=20' even though rfc2047
                 * allows using '_' for readability.  Unfortunately,
                 * many programs do not understand this and just
                 * leave the underscore in place.
                 */
-               if (is_rfc2047_special(ch) || ch == ' ') {
-                       strbuf_add(sb, line + last, i - last);
+               if (is_rfc2047_special(ch) || ch == ' ' || ch == '\n') {
                        strbuf_addf(sb, "=%02X", ch);
-                       last = i + 1;
+                       line_len += 3;
+               }
+               else {
+                       strbuf_addch(sb, ch);
+                       line_len++;
                }
        }
-       strbuf_add(sb, line + last, len - last);
        strbuf_addstr(sb, "?=");
 }
 
@@ -270,6 +287,7 @@ void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
        if (fmt == CMIT_FMT_EMAIL) {
                char *name_tail = strchr(line, '<');
                int display_name_length;
+               int final_line;
                if (!name_tail)
                        return;
                while (line < name_tail && isspace(name_tail[-1]))
@@ -277,6 +295,14 @@ void pp_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
                display_name_length = name_tail - line;
                strbuf_addstr(sb, "From: ");
                add_rfc2047(sb, line, display_name_length, encoding);
+               for (final_line = 0; final_line < sb->len; final_line++)
+                       if (sb->buf[sb->len - final_line - 1] == '\n')
+                               break;
+               if (namelen - display_name_length + final_line > 78) {
+                       strbuf_addch(sb, '\n');
+                       if (!isspace(name_tail[0]))
+                               strbuf_addch(sb, ' ');
+               }
                strbuf_add(sb, name_tail, namelen - display_name_length);
                strbuf_addch(sb, '\n');
        } else {
@@ -1106,11 +1132,10 @@ void pp_title_line(enum cmit_fmt fmt,
                   const char *encoding,
                   int need_8bit_cte)
 {
-       const char *line_separator = (fmt == CMIT_FMT_EMAIL) ? "\n " : " ";
        struct strbuf title;
 
        strbuf_init(&title, 80);
-       *msg_p = format_subject(&title, *msg_p, line_separator);
+       *msg_p = format_subject(&title, *msg_p, " ");
 
        strbuf_grow(sb, title.len + 1024);
        if (subject) {
@@ -1263,3 +1288,10 @@ void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 
        free(reencoded);
 }
+
+void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
+                   struct strbuf *sb)
+{
+       struct pretty_print_context pp = {0};
+       pretty_print_commit(fmt, commit, sb, &pp);
+}