fnc

**fnc 0.14** 2023-04-18 [[history][0.14a] / [diff][0.14b]]

- show msg rather than error if timeline C keymap is used outside a work tree
- check path is in the requested version if T keymap is used with `fnc tl path`
- display the work tree path in checkout diff headlines
- fix diff display bug by resetting diff mode after timeline C keymap is used
- list only user-defined settings with `fnc config`, use --ls flag to show all
- fix unexpected behaviour when switching between diff and timeline views  
  after requesting a diff by tagging arbitrary commits with the `space` keymap
- disallow tagging different wiki pages to request a diff
- warn user rather than silently ignore attempts to tag non-diffable artifacts
- fix bug if timeline C keymap is used when a commit is already tagged
- change diff flags that modify diff views to resolve conflicts with libfossil
- catch trailing `\r` in CRLF files when finding scope for hunk headers
- show unchanged work tree report for all stash abort cases
- fix bug where the stash 'm' option was not available for the first hunk
- display "[current]" label with `fnc timeline -c <symbol>`
- disable landlock support for the `fnc stash` command to fix reparenting bug
- zap dead code
- latest upstream libfossil: [libf:9a8269d737]

**fnc 0.13** 2022-11-26 [[history][0.13a] / [diff][0.13b]]

- improve reporting of invalid diff command arguments (reported by Dan Shearer)
- accept libfossil global `-V|--verbose` option for all commands
- plug memleak when using the `p` keymap in blame view
- fix `fnc blame -r` and make it behave like `fossil blame -o` for familiarity
- improve `fnc timeline <path>` lookup of repository paths not in the work tree

- wrap commit comments to the current view width
- implement cmd_diff() to provide the 'fnc diff' interface
- tailor help/usage output to the specified command
- fix invalid memory read in diff routine
- add support for repository fingerprint version 1
- fix line wrap bug that truncated lines in fullscreen mode

[0.14a]: https://fnc.bsdbox.org/timeline?p=0.14&bt=0.13
[0.14b]: https://fnc.bsdbox.org/vdiff?from=0.13&to=0.14
[0.13a]: https://fnc.bsdbox.org/timeline?p=0.13&bt=0.12
[0.13b]: https://fnc.bsdbox.org/vdiff?from=0.12&to=0.13
[0.12a]: https://fnc.bsdbox.org/timeline?p=0.12&bt=0.11
[0.12b]: https://fnc.bsdbox.org/vdiff?from=0.11&to=0.12
[0.11a]: https://fnc.bsdbox.org/timeline?p=0.11&bt=0.10
[0.11b]: https://fnc.bsdbox.org/vdiff?from=0.10&to=0.11
[0.10a]: https://fnc.bsdbox.org/timeline?p=0.10&bt=0.9

#
# FNC Common Build
#

# CONFIGURATION
CC ?=		cc
PREFIX ?=	/usr/local
MANDIR ?=	/share/man
VERSION ?=	0.14
HASH !=		cut -f 1 manifest.uuid
DATE !=		sed '2q;d' manifest | cut -d ' ' -f 2 | tr T ' '

# FLAGS NEEDED TO BUILD SQLITE3
SQLITE_CFLAGS =	${CFLAGS} -Wall -Werror -Wno-sign-compare -pedantic -std=c99 \
		-DNDEBUG=1 \
		-DSQLITE_DQS=0 \

 * Flags set by callers of the below diff APIs to determine diff output.
 */
enum fnc_diff_flag {
	FNC_DIFF_IGNORE_EOLWS	= 0x01,
	FNC_DIFF_IGNORE_ALLWS	= 0x03,
	FNC_DIFF_SIDEBYSIDE	= 1 << 2,  /* output side-by-side diff */
	FNC_DIFF_VERBOSE	= 1 << 3,  /* show added/rm'd file content */
	FNC_DIFF_BRIEF		= 1 << 4,  /* no content, just index lines */
	FNC_DIFF_HTML		= 1 << 5,
	FNC_DIFF_LINENO		= 1 << 6,  /* show file line numbers */
	FNC_DIFF_NOOPT		= 1 << 8,  /* suppress optimisations (debug) */
	FNC_DIFF_INVERT		= 1 << 9,
	FNC_DIFF_PROTOTYPE	= 1 << 10, /* show scope in hunk header */
	FNC_DIFF_NOTTOOBIG	= 1 << 11, /* don't compute "large" diffs */
	FNC_DIFF_STRIP_EOLCR	= 1 << 12, /* strip trailing '\r' */
	FNC_DIFF_ANSI_COLOR	= 1 << 13

#define FNC_DIFF_CONTEXT_EX	(((uint64_t)0x04) << 32)  /* Allow 0 context */
#define FNC_DIFF_CONTEXT_MASK	((uint64_t)0x0000ffff)    /* Default context */
#define FNC_DIFF_WIDTH_MASK	((uint64_t)0x00ff0000)    /* SBS column width */
};

/*
 * Compute the diff of changes to convert the file in fsl_buffer parameter 1

	_(pfx, DIFF_HUNK),					\
	_(pfx, DIFF_SEPARATOR)

#define VIEW_MODE_ENUM(pfx, _)					\
	_(pfx, NONE),						\
	_(pfx, VERT),						\
	_(pfx, HRZN)

#define STASH_MVMT_ENUM(pfx, _)					\
	_(pfx, NONE),						\
	_(pfx, DOWN),						\
	_(pfx, UP),						\
	_(pfx, UPDOWN)

#define ENUM_INFO(_)						\
	_(fnc_opt_id, FNC, USER_OPTIONS)			\
	_(line_attr, SLINE, LINE_ATTR_ENUM)			\
	_(input_type, INPUT, INPUT_TYPE_ENUM)			\
	_(line_type, LINE, LINE_TYPE_ENUM)			\
	_(view_mode, VIEW_SPLIT, VIEW_MODE_ENUM)		\
	_(stash_mvmt, STASH_MVMT, STASH_MVMT_ENUM)

#define GEN_ENUMS(name, pfx, info) GEN_ENUM(name, pfx, info)
ENUM_INFO(GEN_ENUMS)

#if !defined(HAVE_STDINT_H)
#  define HAVE_STDINT_H 1
#endif
#endif
/* _WIN32 */


#define FSL_LIB_VERSION_HASH "9a8269d7377f77c179c4bfb05cda36c9f01976e8"
#define FSL_LIB_VERSION_TIMESTAMP "2023-03-07 14:32:32.997 UTC"
#define FSL_LIB_CONFIG_TIME "2023-04-17 13:37 GMT"
#if defined(_MSC_VER)
#define FSL_PLATFORM_OS "windows"
#define FSL_PLATFORM_IS_WINDOWS 1
#define FSL_PLATFORM_IS_UNIX 0
#define FSL_PLATFORM_PLATFORM "windows"
#define FSL_PLATFORM_PATH_SEPARATOR ";"
#define FSL_CHECKOUTDB_NAME "./_FOSSIL_"

                        "CASE vmerge.id WHEN -1 THEN '+' ELSE '-' END || mhash,"
                        "  merge"
                        "  FROM vmerge"
                        " WHERE (vmerge.id=-1 OR vmerge.id=-2)"
                        " ORDER BY 1");
    while( !rc && (FSL_RC_STEP_ROW==fsl_stmt_step(&q)) ){
      fsl_id_t const mid = fsl_stmt_g_id(&q, 1);
      /*
        The is-private check is taken from:

        https://fossil-scm.org/home/info/52a66829d655ff35dc52:

        noting that that patch also has (!g.markPrivate), a flag we do
        not currently have in fsl_cx but perhaps should, so that we
        can flag privacy at a higher level when doing a checkin. As of
        this writing (2023-02-02), we do not have any infrastructure
        for making private checkins.
      */
      if( mid != basedOnVid && !fsl_content_is_private(f, mid) ){
        const char *zCherrypickUuid = fsl_stmt_g_text(&q, 0, NULL);
        int const qType = '+'==*(zCherrypickUuid++) ? 1 : -1;
        rc = fsl_deck_Q_add( d, qType, zCherrypickUuid, NULL );
      }
    }
    fsl_stmt_finalize(&q);
    RC;

void fsl_cx_caches_reset(fsl_cx * const f){
  fsl__bccache_reset(&f->cache.blobContent);
  fsl__cx_mcache_clear(f);
  fsl__cx_clear_mf_seen(f, false);
  f->cache.allowSymlinks =
    f->cache.caseInsensitive =

    f->cache.manifestSetting =
    f->cache.searchIndexExists =
    f->cache.seenDeltaManifest = -1;
  if(fsl_cx_db_ckout(f)){
    fsl__ckout_version_fetch(f)
      /* FIXME: this "really should" be fsl__cx_ckout_clear(), but that data is not fetched
         on demand (maybe it should be?). */;
  }else{
    fsl__cx_ckout_clear(f);
  }

        break;
      default:
        fsl__fatal(FSL_RC_ERROR, "Cannot happen. Really.");
    }
    fsl__cx_finalize_cached_stmt(f);
    fsl__db_cached_clear_role(f->dbMain, r)
      /* Make sure that we destroy any cached statements which are
         known to be tied to this db role. */;
    if(db->dbh){
      /* This is our MAIN db. CLOSE it. If we still have a
         secondary/counterpart db open, we'll detach it first. */
      fsl_dbrole_e const counterpart = fsl__dbrole_counterpart(r);
      assert(f->dbMain == db);
      if(db->role & counterpart){
        /* When closing the main db, detach the counterpart db first

  if(fsl_cx_transaction_level(f)){
    /* TODO???: force a full rollback and close it */
    //if(f->repo.db.dbh) fsl_db_rollback_force(&f->repo.db);
    //if(f->ckout.db.dbh) fsl_db_rollback_force(&f->ckout.db);
    return fsl_cx_err_set(f, FSL_RC_MISUSE,
                          "Cannot close repo or checkout with an "
                          "opened transaction.");
  }
  if(!f->dbMain){
    // Make sure that all string resources are cleaned up...
    fsl_db_close(&f->repo.db);
    fsl_db_close(&f->ckout.db);
    return 0;
  }else{
    fsl_db * const dbR = &f->repo.db;
    return fsl__cx_detach_role(f, f->dbMain == dbR
                               ? FSL_DBROLE_REPO
                               : FSL_DBROLE_CKOUT)
      /* Will also close the counterpart db. */;
  }
}

int fsl_repo_close( fsl_cx * const f ){
  return fsl_close_scm_dbs(f);
}

int fsl_ckout_close( fsl_cx * const f ){

/**
   To be called after a repo or checkout/repo combination has been
   opened. This updates some internal cached info based on the
   checkout and/or repo.
*/
static int fsl_cx_after_open(fsl_cx * f){
  f->cache.searchIndexExists = -1;
  int rc = fsl__ckout_version_fetch(f);
  if(!rc) rc = fsl_cx_load_glob_lists(f);
  return rc;
}


static void fsl_cx_fetch_hash_policy(fsl_cx * f){

  if(!rc){
    rc = fsl_db_exec(db,
                     "UPDATE user SET cap='s', pw=lower(hex(randomblob(3)))"
                     " WHERE login=%Q", defaultUser);
    if( !rc && !addOnlyUser ){
      fsl_db_exec_multi(db,
                        "INSERT OR IGNORE INTO user(login,pw,cap,info)"
                        "   VALUES('anonymous',hex(randomblob(8)),'hz',"
                        "          'Anon');"
                        "INSERT OR IGNORE INTO user(login,pw,cap,info)"
                        "   VALUES('nobody','','gjor','Nobody');"
                        "INSERT OR IGNORE INTO user(login,pw,cap,info)"
                        "   VALUES('developer','','dei','Dev');"
                        "INSERT OR IGNORE INTO user(login,pw,cap,info)"
                        "   VALUES('reader','','kptw','Reader');"
                        );
    }
  }
  return rc;
}

int fsl_repo_create(fsl_cx * f, fsl_repo_create_opt const * opt ){
  fsl_db * db = 0;
  fsl_cx F = fsl_cx_empty /* used if !f */;
  int rc = 0;
  char const * userName = 0;

/* Only for debugging */
#define MARKER(pfexp)                                               \
  do{ printf("MARKER: %s:%d:%s():\t",__FILE__,__LINE__,__func__);   \
    printf pfexp;                                                   \
  } while(0)

/**
   Returns 0 if f has no search index or a repo is not opened, else 4
   for an FTS4 index and 5 for an FTS5. If forceRecheck is false then
   a cached values is returned after the first call. If forceRecheck
   is true, the cached value is updated.
 */
static int fsl__search_ndx_exists(fsl_cx * const f, bool forceRecheck){
  fsl_db * const db = fsl_cx_db_repo(f);
  if(db && (f->cache.searchIndexExists<0 || forceRecheck) ){
    const bool b = fsl_db_table_exists(db, FSL_DBROLE_REPO, "ftsdocs");
    if(b){
      f->cache.searchIndexExists =

        fsl_db_table_has_column(db, "ftsdocs", "rowid" )
        ? 5 // FTS5 (fossil as of 2023-01-24)
        : (fsl_db_table_has_column(db, "ftsdocs", "docid" ) ? 4 : 0);
      assert(f->cache.searchIndexExists==4 || f->cache.searchIndexExists==5);
    }else{
      f->cache.searchIndexExists = 0;
    }
  }
  return f->cache.searchIndexExists;
}

static char fsl_satype_letter(fsl_satype_e t){
  switch(t){
    case FSL_SATYPE_CHECKIN: return 'c';
    case FSL_SATYPE_WIKI: return 'w';
    case FSL_SATYPE_TICKET: return 't';
    case FSL_SATYPE_FORUMPOST: return 'f';
    case FSL_SATYPE_TECHNOTE: return 'e';
    default:
      assert(!"Internal misuse of fsl_satype_letter()");
      return 0;
  }
}

int fsl__search_doc_touch(fsl_cx * const f, fsl_satype_e saType,
                         fsl_id_t rid, const char * docName){
  const int ftsVers = fsl__search_ndx_exists(f, false);
  if(!ftsVers || fsl_content_is_private(f, rid)) return 0;
  assert(ftsVers==4 || ftsVers==5 || !"If this fails then our search-index-exists check is wrong.");
  char zType[2] = {0,0};
  zType[0] = fsl_satype_letter(saType);
#if 0
  /* See MARKER() call in the #else block */
  assert(*zType);
  return *zType ? 0 : FSL_RC_MISUSE;
#else
  /* Reminder: fossil(1) does some once-per-connection init here which
     installs UDFs used by the search process. Those will be significant
     for us if we add the search features to the library. */
  assert(zType[0] && "Misuse of fsl__search_doc_touch()'s 2nd parameter.");
  fsl_db * const db = fsl_cx_db_repo(f);
  int rc = 0;
  char const * zDocId = 4==ftsVers ? "docid" : "rowid";
  rc = fsl_db_exec(db,
       "DELETE FROM ftsidx WHERE %s IN"
       "    (SELECT rowid FROM ftsdocs WHERE type=%Q AND rid=%"FSL_ID_T_PFMT" AND idxed)",
       zDocId, zType, rid );
  if(rc){
    // For reasons i don't understand, this query fails with "SQL logic error"
    // when run from here, but succeeds fine in fossil and fossil's SQL shell.
    MARKER(("type=%s rid=%d rc=%s\n",zType, (int)rid, fsl_rc_cstr(rc)));
    goto end;
  }
  rc = fsl_db_exec(db,
       "REPLACE INTO ftsdocs(type,rid,name,idxed)"
       " VALUES(%Q,%"FSL_ID_T_PFMT",%Q,0)",
       zType, rid, docName );
  if(rc) goto end;
  if( FSL_SATYPE_WIKI==saType || FSL_SATYPE_TECHNOTE==saType ){
    rc = fsl_db_exec(db,
        "DELETE FROM ftsidx WHERE %s IN"
        "    (SELECT rowid FROM ftsdocs WHERE type=%Q AND name=%Q AND idxed)",
        zDocId, zType, docName );
    if(!rc) rc = fsl_db_exec(db,
        "DELETE FROM ftsdocs WHERE type=%Q AND name=%Q AND rid!=%"FSL_ID_T_PFMT,
        zType, docName, rid );
  }
  /* All forum posts are always indexed */
  end:
  return rc;

/**
   Adds a Q-card record to the given deck. The type argument must
   be negative for a backed-out change, positive for a cherrypicked
   change.  target must be a valid UUID string. If baseline is not
   NULL then it also must be a valid UUID.

   Returns 0 on success, non-0 on error. FSL_RC_MISUSE if !mf or
   !target, FSL_RC_SYNTAX if type is 0 or target/baseline are not
   valid UUID strings (baseline may be NULL).
*/
FSL_EXPORT int fsl_deck_Q_add( fsl_deck * const mf, int type,
                               fsl_uuid_cstr target,
                               fsl_uuid_cstr baseline );

/**
   Functionally identical to fsl_deck_B_set() except that it sets
   the R-card. Returns 0 on succes, FSL_RC_RANGE if md5 is not NULL
   or exactly FSL_STRLEN_MD5 bytes long (not including trailing
   NUL). If md5==NULL the current R value is cleared.

  fsl_checkin_queue_f callback;

  /**
     Opaque client-side state for use as the 2nd argument to
     this->callback.
  */
  void * callbackState;

  /* TODO (2023-02-02): any state necessary for indicating that this
     checking should be flagged as "private".
   */
};

/** Convenience typedef. */
typedef struct fsl_checkin_queue_opt fsl_checkin_queue_opt;

/** Initialized-with-defaults fsl_checkin_queue_opt structure, intended for
    const-copy initialization. */

untrusted comment: fnc 0.14 public key
RWTOJ8pPCpW9YMEsLrgLmTRk0huOrEnyiLZRYo36C/9JQF/H3JnCGpFc

struct diff_out_state {
	fsl_output_f	 out;		/* Output callback */
	void		*state;		/* State for this->out() */
	enum line_type	*lines;		/* Diff line type (e.g., minus, plus) */
	uint32_t	 nlines;	/* Index into this->lines */
	int		 rc;		/* Error reporting */
	char		 ansi;		/* ANSI colour code */
	struct hunk_scope {
		const fsl_buffer	*file;		/* Diffed file */
		char			*sig;		/* Matching function */
		char			*spec;		/* C++ specifier */
		uint32_t		 lastmatch;	/* Match line index */
		uint32_t		 lastline;	/* Last line scanned */
		fsl_size_t		 offset;	/* Match byte offset */
	} proto;

			    fsl_output_f, void *, enum line_type **, uint32_t *,
			    /* void *regex, */ uint16_t, short, int, int **);
static int		 fnc_output_f_diff_out(void *, void const *, fsl_size_t);
static int		 diff_outf(struct diff_out_state *, char const *, ... );
static int		 diff_out(struct diff_out_state * const, void const *,
			    fsl_int_t);
static int		 validate_scope_line(const char *);
static int		 match_hunk_function(struct hunk_scope *, fsl_int_t);

static int		 buffer_copy_lines_from(fsl_buffer *const,
			    const fsl_buffer *const, fsl_size_t *, fsl_size_t,
			    fsl_size_t);
/* static uint64_t	 fnc_diff_flags_convert(int); */
/* static int		 diff_context_lines(uint64_t); */
static int		 match_dline(fsl_dline *, fsl_dline *);
static bool		 find_lcs(const char *z, int, const char *, int, int *);

 * Starting from seek lines, copy n lines from src to dst. The seek starts
 * from offset bytes into src->mem. This routine does _not_ modify src.
 */
static int
buffer_copy_lines_from(fsl_buffer *const dst, const fsl_buffer *const src,
    fsl_size_t *offset, fsl_size_t seek, fsl_size_t n)
{
	const char	*z = (const char *)src->mem;
	fsl_size_t	 i, start, ln;


	if (!n)
		return FSL_RC_OK;
	if (dst == NULL)
		return FSL_RC_MISUSE;
	if (*offset > src->used)
		return FSL_RC_RANGE;

	i = *offset;
	ln = start = 0;

	for (;;) {
		if (i == src->used) {
			if (ln == seek && start > 0)
				break;	/* no EOF '\n' so this is seek + n */
			return FSL_RC_NOT_FOUND;
		}
		if (z[i] == '\n') {
			++ln;
			if (ln == seek)
				start = i + 1;  /* skip '\n' */
			if (ln == seek + n)

				break;
		}

		++i;
	}



	*offset = start;

	return fsl_buffer_append(dst, &src->mem[start], i - start);
}

/*
 * If str is a valid scope line (i.e., function prototype; class, namespace,
 * enum, struct, or union declaration; or C++ class specifier) return the
 * corresponding int value.  GNU C and MSVC allow '$' in identifier names:
 *   https://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html
 *   https://docs.microsoft.com/en-us/cpp/cpp/identifiers-cpp
 */
static int
validate_scope_line(const char *str)
{
	if (str && (fsl_isalpha(*str) || *str == '_' || *str == '$')) {
		if (strchr(str, '(') || strchr(str, '{') ||
		    strstr(str, "struct ") || strstr(str, "union ") ||
		    strstr(str, "enum ") || strstr(str, "class ") ||
		    strstr(str, "namespace "))
			return VSL_TRUE;
		if (starts_with(str, "private"))
			return VSL_PRIVATE;

/*
 * Back scan the diffed file dst->proto.file from line pos, which is the first
 * changed line of the current hunk, for the enclosing function in which the
 * hunk resides. Point dst->proto.sig to the heap-allocated matching line,
 * which the caller must eventually free. Return FSL_RC_OK on success.
 */
static int
match_hunk_function(struct hunk_scope *hs, fsl_int_t pos)
{
	fsl_buffer	 buf = fsl_buffer_empty;
	char		*line = NULL;
	fsl_size_t	 offset;
	uint32_t	 last = hs->lastline;
	int		 rc = FSL_RC_OK;

	hs->lastline = pos;
	offset = hs->offset;  /* begin seek from last match */

	while (pos >= 0 && pos >= last) {
		rc = buffer_copy_lines_from(&buf, hs->file, &offset,
		    pos - hs->lastmatch, 1);
		if (rc && rc != FSL_RC_NOT_FOUND)
			return rc;
		line = fsl_buffer_take(&buf);



		switch (validate_scope_line(line)) {
		case VSL_FALSE:
			break;
		case VSL_PRIVATE:
			if (!hs->spec)
				hs->spec = " (private)";
			break;
		case VSL_PROTECT:
			if (!hs->spec)
				hs->spec = " (protected)";
			break;
		case VSL_PUBLIC:
			if (!hs->spec)
				hs->spec = " (public)";
			break;
		case VSL_TRUE:
			line[strcspn(line, "\n")] = '\0';
			line[strcspn(line, "\r")] = '\0';  /* fossil wiki */
			fsl_free(hs->sig);
			hs->sig = line;
			/*
			 * It's expensive to seek from the start of the
			 * file for each hunk when diffing large files,
			 * so save offset and line index of this match.
			 */
			hs->lastmatch = pos;
			hs->offset = offset;
			return FSL_RC_OK;
		}

		/* No match, revert to last offset. */
		fsl_free(line);
		offset = hs->offset;
		--pos;
	}

	return FSL_RC_OK;
}

/*

			if (html) {
				rc = diff_outf(dst, "</span>");
				if (rc)
					return rc;
			}

			if (proto && li + skip > 1) {
				struct hunk_scope	*hs = &dst->proto;
				int			 n = 55;

				rc = match_hunk_function(hs, li + skip + context);

				if (rc)
					return rc;

				if (hs->spec)
					n -= fsl_strlen(hs->spec);
				if (hs->sig) {
					rc = diff_outf(dst, " %.*s", n, hs->sig);

					if (rc)
						return rc;
				}
				if (hs->spec) {
					rc = diff_outf(dst, " %s", hs->spec);

					if (rc)
						return rc;
				}
			}
			rc = diff_out(dst, "\n", 1);
			if (rc)
				return rc;

.Ar setting ,
otherwise
.Nm
will display the current value of
.Ar setting .
With no arguments,
.Nm Cm config
will display a list of all user-defined settings.
See
.Sx ENVIRONMENT
for a detailed list of available settings
used in the display or processing of data.
When no value is defined for a given setting in the local repository,
environment variables will be searched.
If still not found,
.Nm
will fallback to default values.
Unless the
.Sy --repo
option is used, this command must be invoked from within a work tree; that is,
.Nm
assumes a local checkout is open in or above the current working directory.
Options for
.Nm Cm config
are as follows:
.Bl -tag -width Ds
.It Fl h , -help
Display config command help and usage information then exit.
.It Fl -ls
List all available settings.
.It Fl R , -repo Ar path
Use the
.Xr fossil 1
repository at the specified
.Ar path
for the current
.Nm Cm config

#include <sys/queue.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>







#include <fcntl.h>
#include <ctype.h>
#include <curses.h>
#include <panel.h>
#include <locale.h>
#include <stdlib.h>
#include <stdarg.h>

	    fcli_cliflag_empty_m
	}, /* End cliflags_blame. */

	{ /* cliflags_config config command related options. */
	    FCLI_FLAG_BOOL("h", "help", NULL,
	    "Display config command help and usage."),
	    FCLI_FLAG_BOOL(NULL, "ls", &fnc_init.lsconf,
	    "Display a list of all available settings."),
	    FCLI_FLAG_CSTR("R", "repo", "<path>", NULL,
	    "Use the fossil(1) repository located at <path> for this config\n"
	    "    invocation."),
	    FCLI_FLAG_BOOL("u", "unset", &fnc_init.unset,
	    "Unset (i.e., remove) the specified repository setting."),
	    fcli_cliflag_empty_m
	}, /* End cliflags_tree. */

	struct commit_queue	 commits;
	struct commit_entry	*first_commit_onscreen;
	struct commit_entry	*last_commit_onscreen;
	struct commit_entry	*selected_entry;
	struct commit_entry	*matched_commit;
	struct commit_entry	*search_commit;
	struct fnc_colours	 colours;
	struct timeline_tag {
		struct fnc_commit_artifact	*one;	/* 1st tagged entry */
		struct fnc_commit_artifact	*two;	/* 2nd tagged entry */
		fsl_uuid_str			 ogid;	/* parent uuid of two */


		fsl_id_t			 ogrid;	/* parent rid of two */
	} tag;
	const char		*ckout_id;
	const char		*glob;  /* Match commits containing glob. */
	char			*path;	/* Match commits involving path. */
	int			 selected;
	int			 nscrolled;
	uint16_t		 maxx;
	sig_atomic_t		 quit;
	pthread_t		 thread_id;

static int		 write_commit_line(struct fnc_view *,
			    struct fnc_commit_artifact *, int);
static int		 view_input(struct fnc_view **, int *,
			    struct fnc_view *, struct view_tailhead *);
static int		 cycle_view(struct fnc_view *);
static int		 toggle_fullscreen(struct fnc_view **,
			    struct fnc_view *);
static int		 stash_help(struct fnc_view *, enum stash_mvmt);
static int		 help(struct fnc_view *);
static int		 padpopup(struct fnc_view *, const char *[][2],
			    const char **, const char *, enum stash_mvmt);
static int		 centerprint(WINDOW *, size_t, size_t, size_t,
			    const char *, chtype);
static int		 tl_input_handler(struct fnc_view **, struct fnc_view *,
			    int);
static int		 move_tl_cursor_down(struct fnc_view *, uint16_t);
static void		 move_tl_cursor_up(struct fnc_view *, uint16_t, bool);
static int		 timeline_scroll_down(struct fnc_view *, int);
static void		 timeline_scroll_up(struct fnc_tl_view_state *, int);
static int		 tag_timeline_entry(struct fnc_tl_view_state *);
static void		 select_commit(struct fnc_tl_view_state *);
static int		 request_view(struct fnc_view **, struct fnc_view *,
			    enum fnc_view_id);
static int		 init_view(struct fnc_view **, struct fnc_view *,
			    enum fnc_view_id, int, int);
static enum view_mode	 view_get_split(struct fnc_view *, int *, int *);
static int		 split_view(struct fnc_view *, int *);

static int		 diff_file(struct fnc_diff_view_state *, fsl_buffer *,
			    const char *, const char *, fsl_uuid_cstr,
			    const char *, const fsl_ckout_change_e);
static int		 diff_non_checkin(struct fnc_diff_view_state *);
static int		 diff_file_artifact(struct fnc_diff_view_state *,
			    fsl_id_t, const fsl_card_F *, const fsl_card_F *,
			    const fsl_ckout_change_e);
static int		 show_diff_view(struct fnc_view *);
static int		 draw_diff_headln(struct fnc_view *);

static int		 match_line(const char *, regex_t *, size_t,
			    regmatch_t *);
static int		 draw_matched_line(struct fnc_view *, const char *,
			    int *, int, int, regmatch_t *, attr_t);
static void		 drawborder(struct fnc_view *);
static int		 diff_input_handler(struct fnc_view **,
			    struct fnc_view *, int);

static int		 fnc_stash_get(bool);
static int		 select_hunks(struct fnc_view *);
static int		 stash_input_handler(struct fnc_view *, bool *);
static void		 set_choice(struct fnc_diff_view_state *, bool *,
			    struct input *, struct index *, uint32_t *,
			    size_t *, size_t *, bool *, enum stash_opt *);
static unsigned char	*alloc_bitstring(size_t);
static int		 generate_prompt(char *, char *, size_t,
			    enum stash_mvmt);
static bool		 valid_input(const char, char *);
static int		 revert_ckout(bool, bool);
static int		 rm_vfile_renames_cb(fsl_stmt *, void *);
static int		 fnc_patch(struct patch_cx *, const char *);
static int		 scan_patch(struct patch_cx *, FILE *);
static int		 find_patch_file(struct fnc_patch_file **,
			    struct patch_cx *, FILE *);
static int		 parse_filename(const char *, char **, int);

static bool		 view_is_parent(struct fnc_view *);
static void		 view_set_child(struct fnc_view *, struct fnc_view *);
static int		 view_close_child(struct fnc_view *);
static int		 close_tree_view(struct fnc_view *);
static int		 close_timeline_view(struct fnc_view *);
static int		 close_diff_view(struct fnc_view *);
static void		 free_index(struct index *, bool);
static int		 reset_tags(struct fnc_tl_view_state *);
static int		 view_resize(struct fnc_view *, bool);
static bool		 screen_is_split(struct fnc_view *);
static bool		 screen_is_shared(struct fnc_view *);
static void		 updatescreen(WINDOW *, bool, bool);
static void		 fnc_resizeterm(void);
static int		 join_tl_thread(struct fnc_tl_view_state *);
static void		 fnc_free_commits(struct commit_queue *);

static bool		 fnc_str_has_upper(const char *);
static int		 fnc_make_sql_glob(char **, char **, const char *,
			    bool);
static const char	*gettzfile(void);
#ifndef HAVE_LANDLOCK
static int		 init_unveil(const char **, const char **, int, bool);
#else
static int		 init_landlock(const char **, const char **, const int);
#define init_unveil(_p, _m, _n, _d)	init_landlock(_p, _m, _n)
#endif  /* HAVE_LANDLOCK */
static const char	*getdirname(const char *, fsl_int_t, bool);
static int		 set_colours(struct fnc_colours *, enum fnc_view_id);
static int		 set_colour_scheme(struct fnc_colours *,
			    const int (*)[2], const char **, int);
static int		 init_colour(enum fnc_opt_id);
static int		 default_colour(enum fnc_opt_id);

int
main(int argc, const char **argv)
{
	const fcli_command	*cmd = NULL;
	char			*path = NULL;
	int			 rc = FSL_RC_OK;





	if (!isatty(fileno(stdin)))

		errx(1, "stdin is not a tty");


	setlocale(LC_CTYPE, "");


	fnc_init.cmdarg = argv[1];	/* Which cmd to show usage if needed. */
#if DEBUG
	fcli.clientFlags.verbose = 2;	/* Verbose error reporting. */
#endif
	rc = fcli_setup_v2(argc, argv, fnc_init.cliflags_global,
	    &fnc_init.fnc_help);

		rc = RC(FSL_RC_RANGE, "strlcpy");
		fsl_free(*child);
		*child = NULL;
	}
	return rc;
}









static int
init_curses(void)
{
	int rc;

	rc = fnc_set_signals();
	if (rc)

	if (path != s->path) {
		fsl_free(s->path);
		s->path = fsl_strdup(path);
		if (s->path == NULL)
			return RC(FSL_RC_ERROR, "fsl_strdup");
	}














	TAILQ_INIT(&s->commits.head);

	fsl_ckout_version_info(f, NULL, &s->ckout_id);

	if (rid)
		startdate = fsl_mprintf("(SELECT mtime FROM event "
		    "WHERE objid=%d)", rid);



	/*
	 * In 'fnc tl -R <repo> <path>' or 'fnc tl -c <sym> <path>' case,
	 * check that path is a valid path in the tree as at either the
	 * latest checkin or the specified commit.
	 */
	if (path) {
		fsl_uuid_str id = NULL;

		if (rid)
			id = fsl_rid_to_uuid(f, rid);

		rc = valid_path(path, id ? id : "tip");
		fsl_free(id);

				/* FALL THROUGH */
			default:
				break;
			}
		}

		if ((idxstr = fsl_mprintf("%s [%d/%d] %s",
		    !fsl_strcmp(uuid, s->ckout_id) ? " [current]" : "",
		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
		    search_str ? search_str : (branch ? branch : "")))
		    == NULL) {
			rc = RC(FSL_RC_RANGE, "fsl_mprintf");
			goto end;
		}
	}

		entry = TAILQ_NEXT(entry, entries);
	}

	ncommits = 0;
	entry = s->first_commit_onscreen;
	s->last_commit_onscreen = s->first_commit_onscreen;
	while (entry) {
		struct timeline_tag *t = &s->tag;

		if (ncommits >= MIN(view->nlines - 1, view->lines - 1))
			break;

		if ((t->one && !t->two && entry->commit == t->one) ||
		    ncommits == s->selected)

			wattr_on(view->window, A_REVERSE, NULL);
		rc = write_commit_line(view, entry->commit, maxlen);
		if ((t->one && !t->two && entry->commit == t->one) ||
		    ncommits == s->selected)

			wattr_off(view->window, A_REVERSE, NULL);

		++ncommits;
		s->last_commit_onscreen = entry;
		entry = TAILQ_NEXT(entry, entries);
	}
	drawborder(view);

end:

		break;
	case KEY_F(1):
	case 'H':
	case '?':
		rc = help(view);
		break;
	case 'q':
		if (view->parent && view->parent->vid == FNC_VIEW_TIMELINE) {
			rc = reset_tags(&view->parent->state.timeline);
			if (rc)
				return rc;
			if (view->mode == VIEW_SPLIT_HRZN) {
				/* may need more commits to fill fullscreen */
				rc = request_tl_commits(view->parent);
				if (rc)
					return rc;
				view->parent->mode = VIEW_SPLIT_NONE;
			}
		}
		rc = view->input(new, view, ch);
		view->egress = true;
		break;
	case 'f':
		rc = toggle_fullscreen(new, view);
		break;

			rc = offset_selected_line(view);
	}

	return rc;
}

static int
stash_help(struct fnc_view *view, enum stash_mvmt scroll)
{
	char			*title = NULL;
	static const char	*keys[][2] = {
	    {"", ""},
	    {"", ""},
	    {"  b ", "  ❬b❭ "},
	    {"  m ", "  ❬m❭ "},
	    {"  y ", "  ❬y❭ "},
	    {"  n ", "  ❬n❭ "},
	    {"  a ", "  ❬a❭ "},
	    {"  k ", "  ❬k❭ "},
	    {"  A ", "  ❬A❭ "},
	    {"  K ", "  ❬K❭ "},
	    {"  ? ", "  ❬?❭ "},
	    {"  q ", "  ❬q❭ "},
	    {"  Q ", "  ❬Q❭ "},
	    {"", ""},
	    {"", ""},
	    {NULL, NULL}
	};
	static const char *desc[] = {
	    "",
	    "Stash",
	    "- scroll back to the previous page^",
	    "- show more of this hunk on the next page^",
	    "- stash this hunk",

/*
 * Create popup pad in which to write the supplied txt string and optional
 * title. The pad is contained within a window that is offset four columns in
 * and two lines down from the parent window.
 */
static int
padpopup(struct fnc_view *view, const char *keys[][2], const char **desc,
    const char *title, enum stash_mvmt stash)
{
	WINDOW		*win, *content;
	FILE		*txt;
	char		*line = NULL;
	ssize_t		 linelen;
	size_t		 linesz;
	int		 ch, cury, curx, end, ln, width, wy, wx, x0, y0;

	/*
	 * Format help text, and compute longest line and total number of
	 * lines in text to be displayed to determine pad dimensions.
	 */
	width = fsl_strlen(title);
	for (ln = 0; keys[ln][0]; ++ln) {
		if ((stash == STASH_MVMT_NONE && (ln == 2 || ln == 3)) ||
		    (stash == STASH_MVMT_NONE && ln == 14) ||
		    (stash == STASH_MVMT_DOWN && ln == 2) ||
		    (stash == STASH_MVMT_UP && ln == 3))
			continue;  /* only show available stash keymaps */

		if (keys[ln][1]) {
			width = MAX((fsl_size_t)width,
			    fsl_strlen(keys[ln][cs]) + fsl_strlen(desc[ln]));
		}
		fprintf(txt, "%s%s%c", keys[ln][cs], desc[ln],
		    keys[ln + 1][0] ? '\n' : 0);
	}
	++width;
	rewind(txt);

	x0 = 4;	 /* column number at which to start the help window */
	y0 = 2;	 /* line number at which to start the help window */

static int
tl_input_handler(struct fnc_view **new_view, struct fnc_view *view, int ch)
{
	struct fnc_tl_view_state	*s = &view->state.timeline;
	int				 rc = FSL_RC_OK;
	uint16_t			 nscroll = view->nlines - 2;



	switch (ch) {
	case '0':
		view->pos.col = 0;
		break;
	case '$':
		view->pos.col = MAX(s->maxx - view->ncols / 2, 0);
		break;

		    !s->thread_cx.eotl) {
			s->thread_cx.ncommits_needed += (view->nlines - 1) -
			    s->commits.ncommits;
			rc = signal_tl_thread(view, 1);
		}
		break;
	case 'C': {
		fsl_cx *const f = fcli_cx();

		if (*s->selected_entry->commit->type != 'c')
			return sitrep(view, SR_ALL,
			    "-- requires check-in artifact --");

		if (!fsl_needs_ckout(f))
			return sitrep(view, SR_ALL, "-- requires work tree --");


		/*
		 * XXX This is not good but I can't think of an alternative
		 * without patching libf: fsl_ckout_changes_scan() returns a
		 * db lock error via fsl_vfile_changes_scan() when versioned
		 * files are modified at runtime. Clear it and notify user.
		 */
		rc = fsl_ckout_changes_scan(f);
		if (rc) {


			if (rc != FSL_RC_DB)
				return RC(rc, "fsl_ckout_changes_scan");
			return sitrep(view, SR_ALL, "-- checkout db busy --");
		}

		if (!fsl_ckout_has_changes(f))
			return sitrep(view, SR_CLREOL | SR_UPDATE | SR_SLEEP,
			    "-- no local changes --");


		rc = reset_tags(s);
		if (rc)
			return rc;
		s->selected_entry->commit->diff_type = FNC_DIFF_CKOUT;
	}	/* FALL THROUGH */
	case ' ':
		if (*s->selected_entry->commit->type != 'c' &&
		    *s->selected_entry->commit->type != 'w')
			return sitrep(view, SR_ALL,
			    "-- requires check-in or wiki artifact --");

		if (s->tag.two != NULL) {
			rc = reset_tags(s);
			if (rc)
				return rc;
		}

		rc = tag_timeline_entry(s);
		if (rc) {
			if (rc == FSL_RC_BREAK)
				return FSL_RC_OK;
			if (rc == FSL_RC_TYPE)
				return sitrep(view, SR_ALL,
				    "-- tag must be another %s artifact -- ",
				    *s->tag.one->type  == 'c' ?
				    "check-in" : "wiki");
			if (rc == FSL_RC_MISUSE)
				return sitrep(view, SR_ALL,
				    "-- tag must be another %s wiki page -- ",
				    strchr(s->tag.one->comment, ':') + 2);
			return rc;
		}
		rc = request_view(new_view, view, FNC_VIEW_DIFF);
		break;

	case KEY_ENTER:
	case '\r':
		rc = reset_tags(s);
		if (rc)
			return rc;
		rc = request_view(new_view, view, FNC_VIEW_DIFF);
		break;
	case 'b':
		rc = request_view(new_view, view, FNC_VIEW_BRANCH);
		break;
	case 'c':
		s->colour = !s->colour;

			rc = sitrep(view, SR_ALL, "-- no matching commits --");
		}
		break;
	}
	case 't':
		if (s->selected_entry == NULL)
			break;

		if (!fsl_rid_is_a_checkin(fcli_cx(),
		    s->selected_entry->commit->rid))
			return sitrep(view, SR_CLREOL | SR_UPDATE | SR_SLEEP,
			    "-- tree requires check-in artifact --");

		if (s->path) {
			rc = valid_path(s->path,
			    s->selected_entry->commit->uuid);
			if (rc) {
				if (rc != FSL_RC_UNKNOWN_RESOURCE)
					return rc;
				return sitrep(view, SR_ALL,
				    "-- '%s' not in requested tree --", s->path);
			}
		}

		rc = request_view(new_view, view, FNC_VIEW_TREE);
		break;
	case 'q':
		s->quit = 1;
		break;
	default:
		break;
	}

	return rc;
}

static int
tag_timeline_entry(struct fnc_tl_view_state *s)
{




	if (s->selected_entry->commit->diff_type == FNC_DIFF_CKOUT ||

	    s->tag.one == NULL) {
		s->tag.one = s->selected_entry->commit;


		if (s->tag.one->diff_type != FNC_DIFF_CKOUT)
			return FSL_RC_BREAK;
	} else if (*s->selected_entry->commit->type != *s->tag.one->type)
		return FSL_RC_TYPE;
	else if (s->selected_entry->commit->rid == s->tag.one->rid) {




		s->tag.one = NULL;	/* untag selected entry */

		return FSL_RC_BREAK;
	}

	if (*s->tag.one->type == 'w' &&
	    fsl_strcmp(strchr(s->tag.one->comment, ':') + 2,
	    strchr(s->selected_entry->commit->comment, ':') + 2))
		return FSL_RC_MISUSE;	/* don't diff different wiki pages */

	if (s->selected_entry->commit->prid != s->tag.one->rid)
		s->showmeta = false;

	if (s->selected_entry->commit->puuid != NULL) {
		/* initial commits have no parent, hence the check */
		s->tag.ogid = fsl_strdup(s->selected_entry->commit->puuid);
		if (s->tag.ogid == NULL)
			return RC(FSL_RC_ERROR, "fsl_strdup");
	}

	s->tag.ogrid = s->selected_entry->commit->prid;

	fsl_free(s->selected_entry->commit->puuid);
	s->selected_entry->commit->puuid = fsl_strdup(s->tag.one->uuid);
	if (s->selected_entry->commit->puuid == NULL)
		return RC(FSL_RC_ERROR, "fsl_strdup");

	s->selected_entry->commit->prid = s->tag.one->rid;
	s->tag.two = s->selected_entry->commit;

	return FSL_RC_OK;
}

static int
move_tl_cursor_down(struct fnc_view *view, uint16_t page)
{
	struct fnc_tl_view_state	*s = &view->state.timeline;
	struct commit_entry		*first;

	return rc;
}

static int
close_timeline_view(struct fnc_view *view)
{
	struct fnc_tl_view_state	*s = &view->state.timeline;
	int				 rc1, rc2;

	rc1 = join_tl_thread(s);
	fsl_stmt_finalize(s->thread_cx.q);
	rc2 = reset_tags(s);	/* must be before fnc_free_commits() */
	fnc_free_commits(&s->commits);
	free_colours(&s->colours);
	fsl_free(s->path);
	s->path = NULL;

	return rc1 ? rc1 : rc2;
}















static int
join_tl_thread(struct fnc_tl_view_state *s)
{
	void	*err;
	int	 rc = 0;

	set_diff_opt(s);

	s->index.n = 0;
	s->index.idx = 0;
	s->hundex.n = 0;
	s->paths = paths;
	s->selected_entry = commit;


	s->first_line_onscreen = 1;
	s->last_line_onscreen = view->nlines;
	s->selected_line = 1;
	s->f = NULL;
	s->view = view;
	s->parent_view = parent_view;
	s->diff_mode = mode;

	rc = create_diff(s);
	if (rc) {
		if (s->colour)
			free_colours(&s->colours);
		return rc;
	}

	view->show = show_diff_view;
	view->input = diff_input_handler;
	view->close = close_diff_view;
	view->grep_init = diff_grep_init;
	view->grep = find_next_match;

	return rc;
}

static void
set_diff_opt(struct fnc_diff_view_state *s)
{
	char	*opt;
	char	 ch;
	long	 ctx = DEF_DIFF_CTX;
	int	 i = 0;

	FLAG_SET(s->diff_flags, FNC_DIFF_STRIP_EOLCR);

	/* Command line options. */
	fnc_init.verbose ? FLAG_SET(s->diff_flags, FNC_DIFF_VERBOSE) : 0;
	fnc_init.proto ? FLAG_SET(s->diff_flags, FNC_DIFF_PROTOTYPE) : 0;
	fnc_init.ws ? FLAG_SET(s->diff_flags, FNC_DIFF_IGNORE_ALLWS) : 0;
	fnc_init.eol ? FLAG_SET(s->diff_flags, FNC_DIFF_IGNORE_EOLWS) : 0;
	fnc_init.invert ? FLAG_SET(s->diff_flags, FNC_DIFF_INVERT) : 0;

	if (!rc && s->diff_mode == COMMIT_META)
		rc = write_commit_meta(s);
	if (!rc && s->selected_entry->diff_type == FNC_DIFF_WIKI)
		rc = diff_non_checkin(s);
	if (rc)
		goto end;

	/*
	 * diff headline label (i.e., diff id1 id2) assignment is delayed till
	 * now because wiki parent commits are obtained in diff_non_checkin()
	 */
	if (s->selected_entry->puuid) {
		fsl_free(s->id1);
		s->id1 = fsl_strdup(s->selected_entry->puuid);
		if (s->id1 == NULL) {
			rc = RC(FSL_RC_ERROR, "fsl_strdup");
			goto end;
		}
	} else
		s->id1 = NULL;  /* initial commit, tag, technote, etc. */

	if (s->selected_entry->uuid) {
		fsl_free(s->id2);
		s->id2 = fsl_strdup(s->selected_entry->uuid);
		if (s->id2 == NULL) {
			rc = RC(FSL_RC_ERROR, "fsl_strdup");
			goto end;
		}
	} else
		s->id2 = NULL;  /* local work tree */

	if (s->diff_mode != COMMIT_META) {
		s->index.offset = fsl_realloc(s->index.offset,
		    (s->index.n + 1) * sizeof(off_t));
		s->index.offset[s->index.n++] = 0;
	}

	/*

	fsl_free(xplus0);
	fsl_buffer_clear(&fbuf1);
	fsl_buffer_clear(&fbuf2);
	return rc;
}

static int
show_diff_view(struct fnc_view *view)
















{
	struct fnc_diff_view_state	*s = &view->state.diff;
	regmatch_t			*regmatch = &view->regmatch;
	struct fnc_colour		*c = NULL;
	wchar_t				*wcstr;
	char				*line = NULL;

	size_t				 lidx, linesz = 0;
	ssize_t				 linelen;
	off_t				 line_offset;
	attr_t				 rx = 0;


	int				 col, wstrlen, max_lines = view->nlines;
	int				 nlines = s->nlines;
	int				 nprinted = 0, rc = FSL_RC_OK;
	bool				 selected;

	s->lineno = s->first_line_onscreen - 1;
	line_offset = s->line_offsets[s->lineno];
	if (fseeko(s->f, line_offset, SEEK_SET))
		return RC(fsl_errno_to_rc(errno, FSL_RC_ERROR), "fseeko");

	werase(view->window);







	rc = draw_diff_headln(view);







	if (rc)
		return rc;


















	if (--max_lines < 1)
		return rc;

	s->eof = false;
	while (max_lines > 0 && nprinted < max_lines) {
		col = wstrlen = 0;
		linelen = getline(&line, &linesz, s->f);

		wstandout(view->window);
		waddstr(view->window, "(END)");
		wstandend(view->window);
	}

	return rc;
}

static int
draw_diff_headln(struct fnc_view *view)
{
	struct fnc_diff_view_state	*s = &view->state.diff;
	wchar_t				*wstr;
	const char			*id1, *id2;
	char				 hdr[view->ncols + 1], pct[MAX_PCT_LEN];
	double				 percent;
	fsl_size_t			 len = 0;
	int				 col, dlen, ln, n, npct, rc;
	attr_t				 rx = 0;
	bool				 wt = false;

	ln = s->gtl ? s->gtl : s->lineno + s->selected_line;
	percent = 100.00 * ln / s->nlines;

	npct = snprintf(pct, MAX_PCT_LEN, "%.*lf%%",
	    percent > 99.99 ? 0 : 2, percent);
	if (npct < 0 || npct >= MAX_PCT_LEN)
		return RC(FSL_RC_RANGE, "snprintf");

	/* some diffs (e.g., technote, tag) have no parent hash to display */
	id1 = s->id1 ? s->id1 : "/dev/null";

	/* if diffing the work tree, display work tree path (trim trailing /) */
	if (s->selected_entry->diff_type == FNC_DIFF_CKOUT ||
	    fsl_strcmp(s->id1, s->id2) == 0) {
		id2 = fsl_cx_ckout_dir_name(fcli_cx(), &len);
		wt = true;
	} else if (s->id2)
		id2 = s->id2;
	else
		id2 = "/dev/null";

	dlen = len;
	n = snprintf(hdr, view->ncols + 1, "[%d/%zu] diff %.40s %.*s", ln,
	    s->nlines, id1, wt ? dlen - 1 : 40, id2);
	if (n < 0)  /* ignore truncation */
		return RC(FSL_RC_RANGE, "snprintf");

	rc = formatln(&wstr, &n, hdr, view->ncols, 0, false);
	if (rc)
		return rc;

	if (screen_is_shared(view) || view->active)
		rx = FNC_HIGHLIGHT;

	wattron(view->window, rx);

	waddwstr(view->window, wstr);
	fsl_free(wstr);

	col = n;
	while (col++ < view->ncols)
		waddch(view->window, ' ');
	if (n < view->ncols - npct)
		mvwaddstr(view->window, 0, view->ncols - npct, pct);

	wattroff(view->window, rx);

	return FSL_RC_OK;
}

static bool
screen_is_shared(struct fnc_view *view)
{
	if (view_is_parent(view)) {
		if (view->child == NULL || view->child->active ||
		    !screen_is_split(view->child))

}

static int
diff_input_handler(struct fnc_view **new_view, struct fnc_view *view, int ch)
{
	struct fnc_view			*branch_view;
	struct fnc_diff_view_state	*s = &view->state.diff;



	char				*line = NULL;
	ssize_t				 linelen;
	size_t				 linesz = 0;
	int				 nlines, i = 0, rc = FSL_RC_OK;
	uint16_t			 nscroll = view->nlines - 2;
	bool				 down = false;

		/* FALL THROUGH */
	case CTRL('k'):
	case '<':
	case ',':
	case 'K':
		if (s->parent_view == NULL)
			break;

		if (s->parent_view->vid == FNC_VIEW_TIMELINE) {
			struct fnc_tl_view_state	*ts;
			struct commit_entry		*prev;

			ts = &s->parent_view->state.timeline;
			prev = ts->selected_entry;

			rc = tl_input_handler(NULL, s->parent_view,
			    down ? KEY_DOWN : KEY_UP);
			if (rc)
				break;

			if (prev == ts->selected_entry)
				break;

			if (s->diff_mode == DIFF_PLAIN)
				s->diff_mode = COMMIT_META;

			rc = set_selected_commit(s, ts->selected_entry);
			if (rc)
				break;
		} else if (s->parent_view->vid == FNC_VIEW_BLAME) {
			struct fnc_blame_view_state	*bs;
			fsl_uuid_cstr			 prev_id;

			bs = &s->parent_view->state.blame;
			prev_id = bs->selected_entry->uuid;

			rc = blame_input_handler(&view, s->parent_view,
			    down ? KEY_DOWN : KEY_UP);
			if (rc)
				break;

			if (!fsl_uuidcmp(get_selected_commit_id(bs->blame.lines,
			    bs->blame.nlines, bs->first_line_onscreen,
			    bs->selected_line), prev_id))
				break;

			rc = blame_input_handler(&view, s->parent_view,
			    KEY_ENTER);
			if (rc)
				break;
		}

		s->selected_line = 1;
		rc = reset_diff_view(view, false);


		break;
	default:
		break;
	}

	return rc;
}

	/* 3. revert ckout to apply patches; vfile scanned in cmd_stash() */
	rc = revert_ckout(true, false);
	if (rc) {
		rc = RC(rc, "revert_ckout");
		goto end;
	}

	/*
	 * XXX Older landlock versions do not allow file reparenting (i.e.,
	 * linking and renaming files into different directories). This makes
	 * landlock unusable with our interactive stash implementation (see
	 * apply_patch()) where patches are made to a temporary file in the
	 * work tree root and renamed into the versioned file, which could be
	 * in any number of project subdirectories. Disable landlock support
	 * for the stash command until the newer landlock is ubiquitous.
	 */
#ifndef HAVE_LANDLOCK
	/* with revert_ckout() finished, we can revoke root dir perms */
	rc = init_unveil(
		((const char *[]){ REPODIR, CKOUTDIR, P_tmpdir, gettzfile() }),
		((const char *[]){ "rwc", "rwc", "rwc", "r" }), 4, true
	);
	if (rc)
		goto end;
#endif

	scx->pcx.context = s->context;
	scx->pcx.report = true;  /* report files with changes stashed */

	/* 4. apply patch of hunks selected to stash */
	rc = fnc_patch(&scx->pcx, scx->patch[0]);
	if (rc)

static int
select_hunks(struct fnc_view *view)
{
	int	rc = FSL_RC_OK;
	bool	stashing = false;

	rc = stash_input_handler(view, &stashing);
	if (rc && rc != FSL_RC_BREAK)
		return rc;

	if (!stashing || rc == FSL_RC_BREAK)
		return RC(FSL_RC_BREAK, "no hunks stashed, work tree unchanged");


	return FSL_RC_OK;
}

/*
 * Iterate each hunk of changes in the local checkout, and prompt the user
 * for their choice with: "stash this hunk (b,m,y,n,a,k,A,K,?)? [y]"
 *   b - scroll back (only available if hunk occupies previous page)
 *   m - show more (only available if hunk occupies following page)

	uint32_t			*nh;
	int				 hl, rc = FSL_RC_OK;
	enum stash_opt			 choice = NO_CHOICE;
	bool				 lastfile = false;

	hunks = &s->hundex;
	nh = &hunks->idx;
	in = (struct input){NULL, NULL, INPUT_ALPHA, SR_CLREOL, ""};

	/* Iterate hunks and prompt user to stash or keep in ckout. */
	while (*nh < hunks->n) {
		char	ans[10];
		char	prompt[64];
		int	len;
		enum	stash_mvmt scroll;
		/*
		 * If not yet in the last file of the diff and the next hunk
		 * to choose is in the next file, reset any sticky file choice.
		 */
		if (!lastfile && nxt && hunks->lineno[*nh] >= nxt) {
			nxt = 0;
			*in.buf = 'X';

			s->first_line_onscreen = hunks->lineno[*nh] - 5;
		s->selected_line = 1;
		hl = s->first_line_onscreen;  /* current hunk start line */
redraw:
		rc = view->show(view);
		if (rc)
			return rc;

		updatescreen(view->window, true, true);
		keypad(view->window, false);  /* don't accept arrow keys */

		memset(prompt, '\0', sizeof(prompt));
		last = s->last_line_onscreen;

		len = snprintf(prompt, sizeof(prompt),
		    "[%u/%u] stash this hunk (", hunks->idx + 1, hunks->n);
		if (len < 0 || (len > 0 && (size_t)len >= sizeof(prompt)))
			return RC(FSL_RC_RANGE, "snprintf");

		scroll = STASH_MVMT_NONE;

		/* Enable 'b,m' answers if hunk occupies multiple pages. */
		if (s->first_line_onscreen > hl)
			scroll = STASH_MVMT_UP;
		if (*nh < hunks->n - 1 && hunks->lineno[*nh + 1] > last)
			++scroll;


		else if (*nh == hunks->n - 1 && last < s->nlines)
			++scroll;

		rc = generate_prompt(ans, prompt, sizeof(prompt), scroll);
		if (rc)

			return RC(rc, "generate_prompt(%s)", STRINGIFY(scroll));

		in.prompt = prompt;




		while (!choice && !valid_input(*in.buf, ans)) {
			rc = fnc_prompt_input(view, &in);
			if (rc)
				return rc;

			if (*in.buf == '\0')
				*in.buf = 'y';
			else if (strlen(in.buf) > 1)
				*in.buf = '\0';
			else if (*in.buf == '?' || *in.buf == 'H' ||
			    (int)*in.buf == (KEY_F(1))) {
				rc = stash_help(view, scroll);
				if (rc)
					return rc;
			}

		}

		if (*in.buf == 'm' || *in.buf == 'b') {	 /* scroll pgup/pgdn */
			s->first_line_onscreen = *in.buf == 'm' ?
			    s->last_line_onscreen :
			    MAX(hl, s->first_line_onscreen - view->nlines + 2);
			*in.buf = '\0';
			goto redraw;
		}

		set_choice(s, stashing, &in, hunks, nh, &nxt, &nf, &lastfile,
		    &choice);
	}

	return FSL_RC_OK;
}

/*
 * Construct string ans of valid answers based on scroll, and generate the
 * corresponding prompt with the available answers from which to choose.

 */
static int
generate_prompt(char *ans, char *prompt, size_t sz, enum stash_mvmt scroll)
{
	char	a[] = "bmynakAK";

	size_t	ai, pi;

	/* Set valid answers. */
	switch (scroll) {
	case STASH_MVMT_UPDOWN:


		break;
	case STASH_MVMT_UP:

		memmove(a + 1, a + 2, 7);
		break;

	case STASH_MVMT_DOWN:
		memmove(a, a + 1, 8);

		break;
	case STASH_MVMT_NONE:
		memmove(a, a + 2, 7);

		break;
	}

	/* generate prompt string */
	pi = strlen(prompt);
	for (ai = 0; a[ai]; ++ai) {

		prompt[pi++] = a[ai];
		prompt[pi++] = ',';
	}



	if (memccpy(prompt + pi, "?)? [y] ", '\0', sz) == NULL)


		return RC(FSL_RC_RANGE, "memccpy");




	if (memccpy(ans, a, '\0', sizeof(a)) == NULL)
		return RC(FSL_RC_RANGE, "memccpy");



	return FSL_RC_OK;
}

/*
 * Return true if in is found in valid, else return false.
 * valid must be terminated with a sentinel (NULL) pointer.
 */
static bool
valid_input(const char in, char *valid)
{
	size_t idx;

	for (idx = 0; valid[idx]; ++idx)
		if (in == valid[idx])
			return true;

	return false;
}

/*
 * Set or clear the corresponding bit in bitstring s->scx.stash based on the

	while (*nf < files->n - 1 && *nh < hunks->n - 1 &&
	    files->lineno[*nf] + 5 <= hunks->lineno[*nh + 1])
		++(*nf);

	++(*nh);
}











/*
 * Revert the current checkout. If renames is set, don't revert files that are
 * renamed with _no_ changes. If scan is set, scan for changes before reverting.
 */
static int
revert_ckout(bool renames, bool scan)
{

		fsl_free(h->lines);
		fsl_free(h);
		h = NULL;
	}
	fsl_free(p);
}








































/*
 * Create new stash of changes in checkout vid with stash message msg.
 */
static int
f__stash_create(const char *msg, int vid)
{
	fsl_cx	*const f = fcli_cx();

	return rc;
}

static int
set_selected_commit(struct fnc_diff_view_state *s, struct commit_entry *entry)
{
	fsl_free(s->id2);
	s->id2 = fsl_strdup(entry->commit->uuid);
	if (s->id2 == NULL)
		return RC(FSL_RC_ERROR, "fsl_strdup");

	fsl_free(s->id1);
	if (entry->commit->puuid) {
		s->id1 = fsl_strdup(entry->commit->puuid);
		if (s->id1 == NULL)
			return RC(FSL_RC_ERROR, "fsl_strdup");
	} else
		s->id1 = NULL;

	s->selected_entry = entry->commit;

	return FSL_RC_OK;
}

static void
diff_grep_init(struct fnc_view *view)
{
	struct fnc_diff_view_state *s = &view->state.diff;

close_diff_view(struct fnc_view *view)
{
	struct fnc_diff_view_state	*s = &view->state.diff;
	int				 rc = 0;

	if (s->f && fclose(s->f) == EOF)
		rc = RC(fsl_errno_to_rc(errno, FSL_RC_IO), "fclose");
	fsl_free(s->id1);
	s->id1 = NULL;
	fsl_free(s->id2);
	s->id2 = NULL;
	fsl_free(s->line_offsets);
	free_colours(&s->colours);
	s->line_offsets = NULL;
	s->nlines = 0;
	free_index(&s->index, true);
	free_index(&s->hundex, false);
	fsl_free(s->dlines);

	index->n = 0;
	fsl_free(index->lineno);
	index->lineno = NULL;
	fsl_free(index->offset);
	index->offset = NULL;
}

static int
reset_tags(struct fnc_tl_view_state *s)
{
	struct timeline_tag		*t = &s->tag;
	struct fnc_commit_artifact	*c = t->two;

	t->one = NULL;

	if (!t->ogrid)
		return FSL_RC_OK;

	fsl_free(c->puuid);
	c->puuid = NULL;

	/* restore commit's original parent */

	if (t->ogid != NULL) {
		c->puuid = fsl_strdup(t->ogid);


		fsl_free(t->ogid);
		t->ogid = NULL;
		if (c->puuid == NULL)

			return RC(FSL_RC_ERROR, "fsl_strdup");
	}


	c->diff_type = *c->type == 'c' ? FNC_DIFF_COMMIT : FNC_DIFF_WIKI;
	c->prid = t->ogrid;
	t->ogrid = 0;
	t->two = NULL;
	s->showmeta = true;

	return FSL_RC_OK;
}

static void
fnc_resizeterm(void)
{
	struct winsize	size;
	int		cols, lines;

	commit->uuid = fsl_strdup(commit->puuid);
	commit->type = fsl_strdup("checkin");
	commit->diff_type = diff_type;

	rc = init_curses();
	if (rc)
		goto end;

	/* XXX see comment in fnc_stash() for why landlock is disabled */
#ifndef HAVE_LANDLOCK
	/*
	 * XXX revert_ckout:fsl_ckout_revert()^ walks the tree from
	 * / to the ckout stat(2)ing every dir so we need rx on root.
	 * Revoke root privileges after returning from revert_ckout().
	 * ^fsl__vfile_to_ckout:fsl_mkdir_for_file:fsl_dir_check()
	 */
	rc = init_unveil(((const char *[]){"/", REPODIR, CKOUTDIR, P_tmpdir,
	    gettzfile()}), ((const char *[]){"rx", "rwc", "rwc", "rwc", "r"}),
	    5, false);
	if (rc)
		goto end;
#endif

	view = view_open(0, 0, 0, 0, FNC_VIEW_DIFF);
	if (view == NULL) {
		rc = RC(FSL_RC_ERROR, "view_open");
		goto end;
	}

	rc = open_diff_view(view, commit, NULL, NULL, diff_mode);
	if (rc)
		goto end;

	rc = show_diff_view(view);
	if (rc)
		goto end;
	rc = fnc_stash(view);
	if (rc)
		goto end;
	rc = fsl_vfile_changes_scan(f, rid, FSL_VFILE_CKSIG_HASH);
end:

 */
static int
valid_path(const char *path, const char *sym)
{
	fsl_cx			*const f = fcli_cx();
	fsl_deck		 d = fsl_deck_empty;
	const fsl_card_F	*cf;
	fsl_uuid_str		 id;
	fsl_id_t		 rid;
	int			 rc;
	bool			 valid = false;

	rc = fsl_sym_to_uuid(f, sym, FSL_SATYPE_CHECKIN, &id, &rid);
	if (rc)
		goto end;

	rc = fsl_deck_load_rid(f, &d, rid, FSL_SATYPE_CHECKIN);
	if (rc)
		goto end;

	valid = !!(cf = fsl_deck_F_search(&d, path));
	if (valid)
		goto end;

			valid = true;

	} while (cf && !valid);

end:
	fsl_deck_finalize(&d);
	if (!valid && !rc)
		rc = RC(FSL_RC_UNKNOWN_RESOURCE, "path not found in [%S]: %s",
		    id, path);
	fsl_free(id);
	return rc;
}

static int
browse_commit_tree(struct fnc_view **new_view, int start_col, int start_ln,
    struct commit_entry *entry, const char *path)
{

		te->idx = i++;
	}
	(*tree)->nentries = i;

	return FSL_RC_OK;
}



























/*
 * This routine inserts nodes into the doubly-linked repository tree. Each
 * path component of path (i.e., tokens delimited by '/') becomes a node in
 * tree. The final path component of each segment is the node's .basename, and
 * its full repository relative path its .path. All files in a given directory
 * will comprise the directory node's .children list, and each file node's
 * .sibling list; said directory will be each file node's .parent_dir. The

		return rc;

	opt = fcli_next_arg(true);
	if (opt == NULL || fnc_init.lsconf) {
		if (fnc_init.unset)
			return RC(FSL_RC_MISSING_INFO,
			    "-u|--unset requires <setting>");
		return fnc_conf_lsopt(fnc_init.lsconf);
	}

	setid = fnc_conf_str2enum(opt);
	if (!setid)
		return RC(FSL_RC_NOT_FOUND, "invalid setting: %s", opt);

	value = fcli_next_arg(true);

		last = (value = fnc_conf_getopt(idx, true)) ? idx : last;
		maxlen = MAX(fsl_strlen(fnc_opt_name[idx]), maxlen);
		fsl_free(value);
	}

	if (!last && !all) {
		f_out("No user-defined settings: "
		    "'%s config --ls' for list of available settings.",
		    fcli_progname());
		return 0;
	}

	for (idx = FNC_START_SETTINGS + 1;  idx < FNC_EOF_SETTINGS;  ++idx) {
		value = fnc_conf_getopt(idx, true);
		if (value || all)

#endif

/*
 * Similar to unveil(), grant read and write permissisions to the repo and
 * ckout files, and create permissions to the ckout, repo, and tmp dirs.
 */
static int
init_landlock(const char **paths, const char **perms, const int n)
{
#define LANDLOCK_ACCESS_DIR	(LANDLOCK_ACCESS_FS_READ_FILE |		\
				LANDLOCK_ACCESS_FS_WRITE_FILE |		\
				LANDLOCK_ACCESS_FS_REMOVE_FILE |	\
				LANDLOCK_ACCESS_FS_READ_DIR |		\
				LANDLOCK_ACCESS_FS_MAKE_REG)
	/*