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authormakepost@firemail.cc <makepost@firemail.cc>2019-04-19 15:49:14 -0400
committerRob Landley <rob@landley.net>2019-04-20 16:18:23 -0500
commit5a1a668ce924a9a94c4c4fec5df734070325eeb2 (patch)
treee430bf801d88999e9f2f84971ed81321ea540401 /toys/pending
parent543b2580c78c0f6ed12630d9e63a0420d37b8348 (diff)
downloadtoybox-5a1a668ce924a9a94c4c4fec5df734070325eeb2.tar.gz
Implement man.
To look up docs on my netbook and server. Practically deroff.1, with heuristic for where to put spaces and newlines. How would you simplify file resolution and bzcat? What have I got wrong when escaping slashes, because while \-\^\- is -- ok, \-\- becomes -\-, e.g. in git-pull.1?
Diffstat (limited to 'toys/pending')
-rw-r--r--toys/pending/man.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/toys/pending/man.c b/toys/pending/man.c
new file mode 100644
index 00000000..57f77c61
--- /dev/null
+++ b/toys/pending/man.c
@@ -0,0 +1,112 @@
+/* man.c - Read system documentation
+ *
+ * Copyright 2019 makepost <makepost@firemail.cc>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/man.html
+
+USE_MAN(NEWTOY(man, "<1>1", TOYFLAG_USR|TOYFLAG_BIN))
+
+config MAN
+ bool "man"
+ default n
+ help
+ usage: man COMMAND
+
+ Read manual for system command.
+*/
+
+#define FOR_man
+#include <toys.h>
+#include <glob.h>
+
+GLOBALS(
+ char any, cell, *f, *line;
+)
+
+static void newln()
+{
+ if (TT.any) putchar('\n');
+ if (TT.any && TT.cell != 2) putchar('\n'); // gawk alias
+ TT.any = TT.cell = 0;
+}
+static void put(char *x) { while (*x && *x != '\n') TT.any = putchar(*x++); }
+
+static void s(char *x, char *y) { // Substitute with same length or shorter.
+ int i = strlen(x), j = strlen(y), k, l;
+ for (k = 0; TT.line[k]; k++) if (!strncmp(x, &TT.line[k], i)) {
+ memmove(&TT.line[k], y, j);
+ for (l = k += j; TT.line[l]; l++) TT.line[l] = TT.line[l + i - j];
+ }
+}
+
+static char start(char *x) { return !strncmp(x, TT.line, strlen(x)); }
+static void trim(char *x) { if (start(x)) while (*x++) TT.line++; }
+
+static void do_man(FILE *fp)
+{
+ size_t len = 0;
+ char *line = 0;
+ while (getline(&line, &len, fp) > 0) {
+ TT.line = line;
+ s("\\fB", ""), s("\\fI", ""), s("\\fP", ""), s("\\fR", ""); // bash bold,ita
+ s("\\(aq", "'"), s("\\(cq", "'"), s("\\(dq", "\""); // bash,rsync quote
+ s("\\*(lq", "\""), s("\\*(rq", "\""); // gawk quote
+ s("\\(bu", "*"), s("\\(bv", "|"); // bash symbol
+ s("\\&", ""), s("\\f(CW", ""); // gawk,rsync fancy
+ s("\\-", "-"), s("\\(", ""), s("\\^", ""), s("\\e", "\\"); // bash escape
+ s("\\*(", "#"); // gawk var
+ if (start(".BR")) trim(".BR "), s(" ", ""); // bash boldpunct
+ if (start(".IP")) newln(), trim(".IP "); // bash list
+ if (start(".IR")) trim(".IR "), s(" ", ""); // bash itapunct
+ trim(".B "); // bash bold
+ trim(".BI "); // gawk boldita
+ trim(".FN "); // bash filename
+ trim(".I "); // bash ita
+ trim(".if n "); // bash nroff
+ if (start(".PP")) newln(); // bash paragraph
+ else if (start(".SM")); // bash small
+ else if (start(".S")) newln(), put(TT.line + 4), newln(); // bash section
+ else if (start(".so")) put("See "), put(basename(TT.line + 4)); // lastb
+ else if (start(".TH")) s("\"", " "), put(TT.line + 4); // gawk,git head
+ else if (start(".TP")) newln(), TT.cell = 1; // bash table
+ else if (start(".") || start("\'")); // bash,git garbage
+ else if (!*TT.line); // emerge
+ else ((TT.cell != 0) && TT.cell++), put(" "), put(TT.line);
+ }
+ newln();
+ free(line);
+ fclose(fp);
+}
+
+static FILE *bzcat()
+{
+ char cmd[FILENAME_MAX];
+ snprintf(cmd, sizeof(cmd), "bzcat %s", TT.f);
+ return popen(cmd, "r");
+}
+
+static char *find(char *path, int suf)
+{
+ glob_t g;
+ int i;
+ size_t len = strlen(*toys.optargs);
+ char *name;
+ glob(path, 0, 0, &g);
+ for (i = 0; !TT.f && i < g.gl_pathc; i++) {
+ name = basename(g.gl_pathv[i]);
+ if (strlen(name) == len + suf && !strncmp(name, *toys.optargs, len))
+ TT.f = strdup(g.gl_pathv[i]);
+ }
+ globfree(&g);
+ return TT.f;
+}
+
+void man_main(void)
+{
+ chdir("/usr/share/man");
+ if (find("man?/*.?.bz2", 6)) do_man(bzcat()); // curl_strequal
+ else if (find("man?/*.bz2", 4)) do_man(bzcat()); // curl_strequal.3
+ else if (find("man?/*.?", 2)) do_man(fopen(TT.f, "r")); // curl_strnequal
+ else if (find("man?/*", 0)) do_man(fopen(TT.f, "r")); // curl_strnequal.3
+ if (TT.f) free(TT.f);
+}