For the purpose of applying the patch and committing the results,
implement extracting the patch data, commit message and authorship from
an e-mail message using git-mailinfo.
git-mailinfo is run as a separate process, but ideally in the future,
we should be be able to access its functionality directly without
spawning a new process.
Helped-by: Junio C Hamano
Helped-by: Jeff King
Signed-off-by: Paul Tan
---
Notes:
v2
* use die_errno()
* use '%*d' as the format specifier for msgnum()
builtin/am.c | 228 +++
1 file changed, 228 insertions(+)
diff --git a/builtin/am.c b/builtin/am.c
index 7379b97..a1db474 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -9,6 +9,23 @@
#include "parse-options.h"
#include "dir.h"
#include "run-command.h"
+#include "quote.h"
+
+/**
+ * Returns 1 if the file is empty or does not exist, 0 otherwise.
+ */
+static int is_empty_file(const char *filename)
+{
+ struct stat st;
+
+ if (stat(filename, &st) < 0) {
+ if (errno == ENOENT)
+ return 1;
+ die_errno(_("could not stat %s"), filename);
+ }
+
+ return !st.st_size;
+}
enum patch_format {
PATCH_FORMAT_UNKNOWN = 0,
@@ -23,6 +40,12 @@ struct am_state {
int cur;
int last;
+ /* commit message and metadata */
+ struct strbuf author_name;
+ struct strbuf author_email;
+ struct strbuf author_date;
+ struct strbuf msg;
+
/* number of digits in patch filename */
int prec;
};
@@ -35,6 +58,10 @@ static void am_state_init(struct am_state *state)
memset(state, 0, sizeof(*state));
strbuf_init(&state->dir, 0);
+ strbuf_init(&state->author_name, 0);
+ strbuf_init(&state->author_email, 0);
+ strbuf_init(&state->author_date, 0);
+ strbuf_init(&state->msg, 0);
state->prec = 4;
}
@@ -44,6 +71,10 @@ static void am_state_init(struct am_state *state)
static void am_state_release(struct am_state *state)
{
strbuf_release(&state->dir);
+ strbuf_release(&state->author_name);
+ strbuf_release(&state->author_email);
+ strbuf_release(&state->author_date);
+ strbuf_release(&state->msg);
}
/**
@@ -93,6 +124,95 @@ static int read_state_file(struct strbuf *sb, const char
*file, size_t hint, int
}
/**
+ * Parses the "author script" `filename`, and sets state->author_name,
+ * state->author_email and state->author_date accordingly. We are strict with
+ * our parsing, as the author script is supposed to be eval'd, and loosely
+ * parsing it may not give the results the user expects.
+ *
+ * The author script is of the format:
+ *
+ * GIT_AUTHOR_NAME='$author_name'
+ * GIT_AUTHOR_EMAIL='$author_email'
+ * GIT_AUTHOR_DATE='$author_date'
+ *
+ * where $author_name, $author_email and $author_date are quoted.
+ */
+static int read_author_script(struct am_state *state)
+{
+ char *value;
+ struct strbuf sb = STRBUF_INIT;
+ const char *filename = am_path(state, "author-script");
+ FILE *fp = fopen(filename, "r");
+ if (!fp) {
+ if (errno == ENOENT)
+ return 0;
+ die_errno(_("could not open '%s' for reading"), filename);
+ }
+
+ if (strbuf_getline(&sb, fp, '\n'))
+ return -1;
+ if (!skip_prefix(sb.buf, "GIT_AUTHOR_NAME=", (const char**) &value))
+ return -1;
+ value = sq_dequote(value);
+ if (!value)
+ return -1;
+ strbuf_reset(&state->author_name);
+ strbuf_addstr(&state->author_name, value);
+
+ if (strbuf_getline(&sb, fp, '\n'))
+ return -1;
+ if (!skip_prefix(sb.buf, "GIT_AUTHOR_EMAIL=", (const char**) &value))
+ return -1;
+ value = sq_dequote(value);
+ if (!value)
+ return -1;
+ strbuf_reset(&state->author_email);
+ strbuf_addstr(&state->author_email, value);
+
+ if (strbuf_getline(&sb, fp, '\n'))
+ return -1;
+ if (!skip_prefix(sb.buf, "GIT_AUTHOR_DATE=", (const char**) &value))
+ return -1;
+ value = sq_dequote(value);
+ if (!value)
+ return -1;
+ strbuf_reset(&state->author_date);
+ strbuf_addstr(&state->author_date, value);
+
+ if (fgetc(fp) != EOF)
+ return -1;
+
+ fclose(fp);
+ strbuf_release(&sb);
+ return 0;
+}
+
+/**
+ * Saves state->author_name, state->author_email and state->author_date in
+ * `filename` as an "author script", which is the format used by git-am.sh.
+ */
+static void write_author_script(const struct am_state *state)
+{
+ static const char fmt[] = "GIT_AUTHOR_NAME=%s\n"
+ "GIT_AUTHOR_EMAIL=%s\n"
+ "GIT_AUTHOR_DATE=%s\n";
+ struct strbuf author_name = STRBUF_INIT;
+ struct strbuf author_email = STRBUF_INIT;
+
